Use of Interferon in Preparing Drug for Preventing Coronavirus Infection or Preventing Disease Caused by Coronavirus Infection

Abstract

Disclosed are a use of an interferon in preparing a drug for preventing novel coronavirus SARS-CoV-2 infection or a disease COVID-19 caused by the novel coronavirus infection, and a drug for preventing novel coronavirus infection or preventing a disease COVID-19 caused by the novel coronavirus infection.

Claims

1. A method of preventing coronavirus infection or preventing a disease caused by coronavirus infection, the method comprising administering interferon to a subject in need thereof, wherein the coronavirus is SARS-CoV-2, and preferably the disease caused by coronavirus infection is COVID-19.

2. The method according to claim 1, wherein the coronavirus is mainly SARS-CoV-2 infected through droplet-nose-respiratory tract; and preferably, the interferon is one or more of IFN-α, IFN-β, and IFN-γ families.

3. The method according to claim 1, wherein the interferon is one or a combination of a plurality of IFN-α subtypes, preferably, the interferon is one or more of IFN-α1b, IFN-α2a, IFN-α2b, and IFN-ω, more preferably, IFN-α1b or IFN-α2b, and further preferably, IFN-α2b.

4. The method according to claim 1, wherein the interferon is a natural interferon or a recombinant human interferon, and preferably a recombinant human interferon.

5. The method according to claim 1, wherein the interferon is a common interferon or a long-acting interferon.

6. The method according to claim 1, wherein the interferon is administered nasally.

7. The method according to claim 1, wherein the interferon is present in a dosage form that is prepared with the interferon as a pharmaceutically active ingredient, preferably, the dosage form is a nasal formulation, and more preferably, the nasal formulation is a nasal drop or a nasal spray.

8. The method according to claim 1, wherein the formulation comprises a buffer; and preferably, the buffer is normal saline, phosphate buffer, citrate buffer, glucose saline (5% glucose injection), sodium bicarbonate buffer, acetate buffer or Tris-hydrochloric acid buffer, and more preferably, citrate buffer; and preferably, a final concentration of the interferon is 1000 U/ml to 3000000 U/ml, still preferably 2000 U/ml to 10000 U/ml or 5000 U/ml to 12000 U/ml, more preferably 3000 U/ml, 4000 U/ml, 5000 U/ml, 6000 U/ml, 7000 U/ml, or 8000 U/ml.

9. The method according to claim 1, wherein the drug further comprises another pharmaceutically acceptable carrier or excipient, preferably, the pharmaceutically acceptable carrier or excipient is one or more selected from the group consisting of a mucosal absorption enhancer, a protectant and a bacteriostatic agent; more preferably, the mucosal absorption enhancer is one or more selected from the group consisting of surfactants, cyclodextrins and derivatives thereof, mannitol, phospholipids, peptides and proteolytic enzyme inhibitors, glycyrrhetic acid and its derivatives and metal ion chelating agents, and is more preferably mannitol; the protectant is one or more selected from the group consisting of human albumin, artificial plasma, erythropoietin, brain-derived neurotrophic factor, nerve growth factor, epidermal growth factor, fibroblast growth factor, basic fibroblast growth factor, insulin-like growth factor 1, hyaluronidase, neuregulin, leukemia inhibitory factor, interleukin, interferon-like active substance, tumor necrosis factor, glial growth factor, growth differentiation factor, and nerve growth-related protein, and is more preferably human albumin; the bacteriostatic agent is one or more selected from the group consisting of sorbic acid, potassium sorbate, benzoic acid, parabens, and combined use of benzoic acid and potassium sorbate, and is more preferably sodium benzoate; preferably, a concentration of the mucosal absorption enhancer is 4-28% (v/v), preferably 6-14% (v/v) or 4-15% (v/v), and more preferably 10% (v/v) or 5% (v/v); preferably, a concentration of the protectant is 0.3-2.5% (w/v), preferably 0.8-1.6% (w/v) or 0.3-1.0% (w/v), and more preferably 1.2% (w/v) or 0.5% (w/v); and preferably, a concentration of the bacteriostatic agent is 0.2-0.6% (w/v), preferably 0.25-0.4% (w/v) or 0.45-0.6% (w/v), and more preferably 0.3% (w/v) or 0.5% (w/v).

10. A drug for preventing coronavirus infection or preventing a disease caused by coronavirus infection, wherein the drug comprises interferon; preferably the coronavirus is mainly infected through droplet-nose-respiratory tract; the coronavirus is SARS-CoV-2; preferably, the disease caused by coronavirus infection is COVID-19; and preferably, the drug further comprises the buffer described in claim 8 and/or the carrier or excipient described in claim 9.

11. The method according to claim 1, SARS-CoV-2 comprises wild-type strain and 11 currently known variant strains, wherein the variant strains comprise α, β, δ, γ and Omicron, and Omicron comprises BA.1, BA.2, BA.3, BA.4 and BA.5.

Description

DETAILED DESCRIPTION OF THE EMBODIMENTS

[0059] The present disclosure may be more readily understood in reference to following detailed description of some embodiments of the present disclosure and the examples included therein.

[0060] Before further description of the present disclosure, it should be understood that the present disclosure is not limited to the particular embodiments described, because such embodiments are necessarily in various manners. It should also be understood that the terms used in this specification are intended to illustrate particular embodiments and not of limitation, because the scope of the present disclosure is defined by the appended claims merely.

[0061] Unless otherwise defined herein, scientific and technical terms used in the present disclosure shall have the meanings commonly understood by one of ordinary skill in the art. The meaning and scope of terms should be clear, however, the definitions provided herein take precedence over any dictionary or foreign definitions in the event of any potential ambiguity. In the present application, the use of “or” means “and/or”, unless stated otherwise. Furthermore, the use of the terms “comprise/include/contain” and their other forms is non-limiting.

[0062] In order that the present disclosure can be more readily understood, selected terms are defined below.

[0063] As used herein, the “coronavirus” generally refers to a member of the family Coronaviridae, particularly a virus species of the subfamily Coronaviridae in the family Coronaviridae, and is a positive-sense RNA virus that infects humans and animals and causes respiratory, gastrointestinal, or neurological disease.

[0064] The “novel coronavirus” is a novel virus that broke out around December 2019, and has been officially named by the World Health Organization as SARS-CoV-2. “2019-novel coronavirus”, “2019-nCoV”, and “Severe Acute Respiratory Syndrome Coronavirus 2” are aliases for the virus and can be used interchangeably. In addition to the wild-type strain, SARS-CoV-2 currently already had 11 variant strains, including α, β, δ, γ and Omicron.

[0065] The “SARS-CoV-2 infection” is an infectious disease caused by the novel coronavirus (SARS-CoV-2), including, but not limited to, “novel coronavirus pneumonia”. The World Health Organization named it “Corona Virus Disease 2019”, abbreviated as “COVID-19”, and National Health Commission of the PRC named it “Novel Coronavirus Pneumonia” and “NCP”.

[0066] The use in the “prevention of SARS-CoV-2 infection” includes use in the prevention of novel coronavirus from infecting healthy people, and refers to preventive measures taken to protect or prevent individuals who have not yet been infected with the virus from infection.

[0067] Applicable targets (healthy people mentioned above) for the prevention of SARS-CoV-2 infection described in the present disclosure are preferably healthy people who are negative for novel coronavirus nucleic acid detection or novel coronavirus immunoglobulin.

[0068] The medical workers in the present disclosure refer to doctors, nurses or paramedics who work in the hospitals in SARS-CoV-2 endemic areas, and include the following two groups: 1) medical workers who work in non-isolation wards or non-fever clinics and are not explicitly and directly exposed to patients diagnosed with SARS-CoV-2; and 2) medical workers in direct contact with patients diagnosed with SARS-CoV-2, for example, medical workers who involve in the diagnosis and treatment of patients diagnosed with SARS-CoV-2 in isolation wards, or medical workers who work in fever clinics.

[0069] The applicable objects for the prevention of novel coronavirus diseases described in the present disclosure are preferably SARS-CoV-2 infected people who have been infected with SARS-CoV-2 but have no obvious symptoms.

[0070] The use for “novel coronavirus disease caused by SARS-CoV-2 infection” includes preventing people who have been infected with novel coronavirus from developing the “novel coronavirus disease” or other severe infection consequences.

[0071] The race of the healthy people generally refers to all races, including but not limited to the yellow race, the white race, the black race, the red race, or the mixed race thereof.

[0072] Interferons are divided into two types according to their effects: type I interferons and type II interferons. Type I interferons contain α interferon (IFN-α) and β interferon (IFN-β), and type II interferons contain γ interferon (IFN-γ). According to the antigenicity, interferons are also divided into α, β, and γ interferons. Le interferon is α-interferon (IFN-α), F interferon is β-interferon (IFN-β), and T-interferon is γ-interferon (IFN-γ). α, β, and γ interferons can be divided into several subtypes according to their amino acid sequences of each subtype. The subtypes of α-interferon include IFN-α1, IFN-α2, IFN-α3 (or IFN-αA, IFN-αB, IFN-αC), and IFN-ω.

[0073] The “interferon” described in the present disclosure includes the above-mentioned type I interferon and type II interferon, as well as natural interferons, artificial recombinant interferons, and their subtypes, and the above-mentioned subtypes and IFN-α1b, IFN-α2b, IFN-α1a, IFN-α2a, PEG-IFN-α2b, and the like are all within the scope of the present disclosure.

[0074] The natural interferon described in the present disclosure refers to the interferon obtained through extraction from human tissue.

[0075] The recombinant interferon described in the present disclosure is obtained by gene recombination technology, which involves cloning an interferon gene into a vector, transferring the vector into a host cell and culturing it, and collecting or purify the culture to obtain the interferon.

[0076] In one or more embodiments, the present disclosure also relates to an isolated nucleic acid molecule, which is DNA or RNA encoding the interferon protein as described above. The nucleic acid or its fragment of the present disclosure may be inserted into a suitable vector to form a cloning vector or expression vector carrying the nucleic acid fragment of the present disclosure. This new vector is also a part of the present disclosure. The vectors may include plasmids, phages, cosmids, minichromosomes, or viruses, as well as naked DNA that is transiently expressed in specific cells only. The cloning and expression vectors of the present disclosure are capable of spontaneous replication and thus can provide high copy numbers for high level expression or high level replication of subsequent cloning. The expression vector may include a promoter for driving expression of the nucleic acid fragment of the present disclosure, an optional nucleic acid sequence encoding a signal peptide that enables secretion or integration of the peptide expression product onto a membrane, the nucleic acid fragment of the present disclosure, and an optional nucleic acid sequence encoding a terminator. When the expression vector is manipulated in a production strain or cell line, the vector may or may not be integrated into the host cell genome upon introducing it into the host cell. The vector typically carries a replication site and a marker sequence capable of providing phenotypic selection in transformed cells.

[0077] The term “vector” refers to a molecule or reagent that includes the nucleic acid or its fragment of the present disclosure and is capable of carrying genetic information and delivering it into a cell. Typical vectors include plasmids, viruses, phages, cosmids, and minichromosomes. The cloning vector may contain a selectable marker and an origin of replication compatible with the cell type specified by the cloning vector, and the expression vector may contain a regulatory element necessary to affect expression in a specified target cell.

[0078] In one or more embodiments, the host cells that can be used to express the above vectors include prokaryotic cells and eukaryotic cells. The prokaryotic cells include, but are not limited to, E. coli, and the eukaryotic cells include, but are not limited to, yeast, insect cells, and mammal cells. The host cells may also include many immortalized cell lines. In some aspects of the present disclosure, the interferon may be modified by polyethylene glycol (PEG) to obtain a long-acting interferon. Alternatively, long-acting interferons that are commercially available can also be used.

[0079] In one or more embodiments, embodiments of the present disclosure may also include a pharmaceutically acceptable diluent, excipient, or carrier. It should be understood that the pharmaceutically acceptable diluent, excipient, or carrier is compatible with the active ingredient and is not detrimental to the individual to which it is administered. The diluent may include, but is not limited to, normal saline, potassium chloride, potassium hydrogen phosphate, potassium dihydrogen phosphate, sodium sulfate, sodium chloride, potassium hydroxide, or a combination thereof. The diluents described above can be used to adjust the osmotic pressure and pH value and decrease/increase consistency or solubility of the drug of the present disclosure.

[0080] The carrier may include, but is not limited to, absorption enhancers, emulsifiers, protectants, alcoholic liquids, glycerol, polysorbates, or a combination thereof. The above-mentioned alcoholic liquid may be, but not limited to, a monohydric alcohol or a polyhydric alcohol.

[0081] In some examples, the excipient may be an antioxidant, a colorant, a bacteriostatic agent, or a combination thereof.

[0082] According to some embodiments, the drug of the present disclosure may also be used in conjunction with other supplements or prepared into other compositions.

[0083] The embodiments of the present disclosure will be described in detail below with reference to the examples, but those skilled in the art will understand that the following examples are only used to illustrate the present disclosure and should not be deemed to limit the scope of the present disclosure. The examples for which specific conditions are not indicated are carried out according to the conventional conditions or the conditions recommended by the manufacturers. The used reagents or instruments for which the manufacturers are not indicated are all conventional products that can be purchased from the market.

Example 1 Preparation of Recombinant Human Interferon Formulation

[0084] Formulation 1: Recombinant human interferon α1b (manufactured by Beijing Tri-Prime Gene Pharmaceutical Co., Ltd., SFDA approval number S20010007, trade name: Hapgen) 2000 U/ml, the buffer is normal saline (0.9% sodium chloride injection).

[0085] Formulation 2: Recombinant human interferon α1b (manufactured by Beijing Tri-Prime Gene Pharmaceutical Co., Ltd., SFDA approval number S20010007, trade name: Hapgen) 3000 U/ml, the buffer is normal saline (0.9% sodium chloride injection).

[0086] Formulation 3: Recombinant human interferon α1b (manufactured by Beijing Tri-Prime Gene Pharmaceutical Co., Ltd., SFDA approval number S20010007, trade name: Hapgen) 4000 U/ml, the buffer is normal saline (0.9% sodium chloride injection)

[0087] Formulation 4: Recombinant human interferon α1b (manufactured by Beijing Tri-Prime Gene Pharmaceutical Co., Ltd., SFDA approval number S20010007, trade name: Hapgen) 5000 U/ml, the buffer is normal saline (0.9% sodium chloride injection).

[0088] Formulation 5: Recombinant human interferon α1b (manufactured by Beijing Tri-Prime Gene Pharmaceutical Co., Ltd., SFDA approval number S20010007, trade name: Hapgen) 8000 U/ml, glucose saline (5% glucose injection).

[0089] Formulation 6: Recombinant human interferon α1b (manufactured by Beijing Tri-Prime Gene Pharmaceutical Co., Ltd., SFDA approval number S20010007, trade name: Hapgen) 10000 U/ml, phosphate buffer.

[0090] Formulation 7: Recombinant human interferon α1b (manufactured by Beijing Tri-Prime Gene Pharmaceutical Co., Ltd., SFDA approval number S20010007, trade name: Hapgen) 5000 U/ml, citrate buffer, human albumin 0.3% (w/v), potassium sorbate 0.2% (w/v).

[0091] Formulation 8: Recombinant human interferon α1b (manufactured by Beijing Tri-Prime Gene Pharmaceutical Co., Ltd., SFDA approval number S20010007, trade name: Hapgen) 5000 U/ml, acetate buffer, epidermal growth factor 0.8% (w/v), benzoic acid 0.25% (w/v).

[0092] Formulation 9: Recombinant human interferon α1b (manufactured by Beijing Tri-Prime Gene Pharmaceutical Co., Ltd., SFDA approval number S20010007, trade name: Hapgen) 5000 U/ml, Tris-HCl buffer, erythropoietin 1.6% (w/v), paraben 0.4% (w/v).

[0093] Formulation 10: Recombinant human interferon α1b (manufactured by Beijing Tri-Prime Gene Pharmaceutical Co., Ltd., SFDA approval number S20010007, trade name: Hapgen) 5000 U/ml, normal saline, hyaluronidase 2.5% (w/v), sorbic acid 0.6% (w/v).

[0094] Formulation 11: Recombinant human interferon α1b (manufactured by Beijing Tri-Prime Gene Pharmaceutical Co., Ltd., SFDA approval number S20010007, trade name: Hapgen) 5000 U/ml, normal saline, human albumin 1.2% (w/v), sorbic acid 0.3% (w/v).

[0095] Formulation 12: Recombinant human interferon α1b (manufactured by Beijing Tri-Prime Gene Pharmaceutical Co., Ltd., SFDA approval number S20010007, trade name: Hapgen) 5000 U/ml, cyclodextrin 4% (w/v), human albumin 0.3% (w/v), potassium sorbate 0.2% (w/v), citrate buffer.

[0096] Formulation 13: Recombinant human interferon α1b (manufactured by Beijing Tri-Prime Gene Pharmaceutical Co., Ltd., SFDA approval number S20010007, trade name: Hapgen) 5000 U/ml, TW-80 (Tween 80) 6% (w/v), epidermal growth factor 0.8% (w/v), benzoic acid 0.25% (w/v), acetate buffer.

[0097] Formulation 14: Recombinant human interferon α1b (manufactured by Beijing Tri-Prime Gene Pharmaceutical Co., Ltd., SFDA approval number S20010007, trade name: Hapgen) 5000 U/ml, PEG-400 monooleate 14% (w/v), erythropoietin 1.6% (w/v), paraben 0.4% (w/v), Tris-HCl buffer.

[0098] Formulation 15: Recombinant human interferon α1b (manufactured by Beijing Tri-Prime Gene Pharmaceutical Co., Ltd., SFDA approval number S20010007, trade name: Hapgen) 5000 U/ml, phospholipid 28% (w/v), hyaluronidase 2.5% (w/v), sorbic acid 0.6% (w/v), normal saline.

[0099] Formulation 16: Recombinant human interferon α1b (manufactured by Beijing Tri-Prime Gene Pharmaceutical Co., Ltd., SFDA approval number S20010007, trade name: Hapgen) 5000 U/ml, TW-40 10% (w/v), human albumin 1.2% (w/v), sorbic acid 0.3% (w/v), normal saline.

[0100] Formulation 17: Recombinant human interferon α2b stock solution (manufactured by Tianjin Weiming Biopharmaceutical Co., Ltd. (formerly Tianjin Hualida Bioengineering Co., Ltd.)) 5000 U/ml, the buffer is normal saline (0.9% sodium chloride injection).

[0101] Formulation 18: Recombinant human interferon α2b stock solution (Tianjin Weiming Biopharmaceutical Co., Ltd. (formerly Tianjin Hualida Bioengineering Co., Ltd.)) 6000 U/ml, the buffer is normal saline (0.9% sodium chloride injection).

[0102] Formulation 19: Recombinant human interferon α2b stock solution (Tianjin Weiming Biopharmaceutical Co., Ltd. (formerly Tianjin Hualida Bioengineering Co., Ltd.)) 7000 U/ml, the buffer is normal saline (0.9% sodium chloride injection).

[0103] Formulation 20: Recombinant human interferon α2b stock solution (Tianjin Weiming Biopharmaceutical Co., Ltd. (formerly Tianjin Hualida Bioengineering Co., Ltd.)) 8000 U/ml, the buffer is normal saline (0.9% sodium chloride injection).

[0104] Formulation 21: Recombinant human interferon α2b stock solution (Tianjin Weiming Biopharmaceutical Co., Ltd. (formerly Tianjin Hualida Bioengineering Co., Ltd.)) 10000 U/ml, glucose saline (5% glucose injection).

[0105] Formulation 22: Recombinant human interferon α2b stock solution (Tianjin Weiming Biopharmaceutical Co., Ltd. (formerly Tianjin Hualida Bioengineering Co., Ltd.)) 12000 U/ml, phosphate buffer.

[0106] Formulation 23: Recombinant human interferon α2b stock solution (Tianjin Weiming Biopharmaceutical Co., Ltd. (formerly Tianjin Hualida Bioengineering Co., Ltd.)) 8000 U/ml, citrate buffer, human albumin 0.5% (w/v), sodium benzoate 0.5% (w/v).

[0107] Formulation 24: Recombinant human interferon α2b stock solution (Tianjin Weiming Biopharmaceutical Co., Ltd. (formerly Tianjin Hualida Bioengineering Co., Ltd.)) 8000 U/ml, acetate buffer, epidermal growth factor 0.8% (w/v), benzoic acid 0.25% (w/v).

[0108] Formulation 25: Recombinant human interferon α2b stock solution (Tianjin Weiming Biopharmaceutical Co., Ltd. (formerly Tianjin Hualida Bioengineering Co., Ltd.) 8000 U/ml, Tris-HCl buffer, erythropoietin 1.6% (w/v), paraben 0.4% (w/v).

[0109] Formulation 26: Recombinant human interferon α2b stock solution (Tianjin Weiming Biopharmaceutical Co., Ltd. (formerly Tianjin Hualida Bioengineering Co., Ltd.) 8000 U/ml, normal saline, hyaluronidase 2.5% (w/v), sorbic acid 0.6% (w/v).

[0110] Formulation 27: Recombinant human interferon α2b stock solution (Tianjin Weiming Biopharmaceutical Co., Ltd. (formerly Tianjin Hualida Bioengineering Co., Ltd.) 8000 U/ml, normal saline, human albumin 1.2% (w/v), sorbic acid 0.3% (w/v).

[0111] Formulation 28: Recombinant human interferon α2b stock solution (Tianjin Weiming Biopharmaceutical Co., Ltd. (formerly Tianjin Hualida Bioengineering Co., Ltd.) 8000 U/ml, cyclodextrin 4% (w/v), human albumin 0.3% (w/v), potassium sorbate 0.2% (w/v), citrate buffer.

[0112] Formulation 29: Recombinant human interferon α2b stock solution (Tianjin Weiming Biopharmaceutical Co., Ltd. (formerly Tianjin Hualida Bioengineering Co., Ltd.) 8000 U/ml, TW-80 6% (w/v), epidermal growth factor 0.8% (w/v), benzoic acid 0.25% (w/v), acetate buffer.

[0113] Formulation 30: Recombinant human interferon α2b stock solution (Tianjin Weiming Biopharmaceutical Co., Ltd. (formerly Tianjin Hualida Bioengineering Co., Ltd.) 8000 U/ml, PEG-400 monooleate 14% (w/v), erythropoietin 1.6% (w/v), paraben 0.4% (w/v), Tris-HCl buffer.

[0114] Formulation 31: Recombinant human interferon α2b stock solution (Tianjin Weiming Biopharmaceutical Co., Ltd. (formerly Tianjin Hualida Bioengineering Co., Ltd.) 8000 U/ml, phospholipid 28% (w/v), hyaluronidase 2.5% (w/v), sorbic acid 0.6% (w/v), normal saline.

[0115] Formulation 32: Recombinant human interferon α2b stock solution (Tianjin Weiming Biopharmaceutical Co., Ltd. (formerly Tianjin Hualida Bioengineering Co., Ltd.) 8000 U/ml, TW-80 0.004% (w/v), human albumin 0.5% (w/v), sodium benzoate 0.5% (w/v), mannitol 5% (w/v), citrate buffer.

[0116] The components in each formulation described above were mixed to prepare a recombinant human interferon nasal drop or nasal spray.

[0117] The original formulation of recombinant human interferon α1b used in the above formulations is commercially available, and its spray or injection can be used, diluted as required, and mixed with a pharmaceutically acceptable carrier or excipient to prepare nasal formulations of recombinant human interferon α1b in different concentrations in the present disclosure. The recombinant human interferon α2b is also commercially available. The recombinant human interferon α2b was diluted as required, and then mixed with a pharmaceutically acceptable carrier or excipient to prepare nasal formulations of recombinant human interferon α1b in different concentrations in the present disclosure. The concentrations of recombinant human interferon α1b and recombinant human interferon α2b given in Formulations 1-32 above were the final concentrations of interferon in Formulations 1-32.

Example 2 Preventive Effect of Recombinant Human Interferon Formulation (Formulation 2) for People Outside Isolation Wards

[0118] As of Feb. 5, 2020, a city in a 2019-nCoV epidemic area had a total of 353 patients diagnosed with 2019-nCoV infection. A considerable number of these patients were admitted to the infection isolation ward of Taihe Hospital Affiliated to Hubei University of Medicine, a third-grade class-A hospital in Shiyan City. Therefore, the interferon formulation described in the present disclosure was administrated to the medical workers who worked in a non-isolation ward or a non-fever clinic of Taihe Hospital, and were not explicitly and directly exposed to patients diagnosed with 2019-nCoV. Comparison was performed between infection status of these medical workers with those in third-grade class-A hospitals in Hubei epidemic area, to observe the preventive effect of the formulation on novel coronavirus infection.

[0119] In this example, about 2000 medical workers who worked outside of isolation wards and fever clinics and were not directly exposed to infected patients were each administrated with the α interferon nasal drop of Formulation 2 in Example 1 through nasal drip, 2-3 drops each time per nostril, four times a day, and observed for 14 days (from January 31 to Feb. 13, 2020).

[0120] The observation results showed that, during the incubation period of the novel coronavirus, none of the subject medical workers in the non-isolation wards of Taihe Hospital was found to be infected with the virus, nor was there any case of the novel coronavirus disease (COVID-19).

Example 3 Preventive Effect of Recombinant Human Interferon Formulation (Formulation 28) for People Outside Isolation Wards

[0121] The interferon formulation described in the present disclosure was administrated to the medical workers who worked in a non-isolation ward or a non-fever clinic of a third-grade class-A hospital in Hubei Province, and were not explicitly and directly exposed to patients diagnosed with 2019-nCoV. Comparison was performed between infection status of these medical workers with those in third-grade class-A hospitals in Hubei epidemic area, to observe the preventive effect of the formulation on novel coronavirus infection.

[0122] In this example, about 200 medical workers who worked outside of isolation wards for the treatment of SRAS-CoV-2 patients and fever clinics and were not directly exposed to infected patients were each administrated with the α2b interferon nasal drop of Formulation 28 in Example 1 through nasal drip, 2-3 drops each time per nostril, four times a day, and observed for 14 days (from January 31 to Feb. 13, 2020).

[0123] The observation results showed that, during the incubation period of the novel coronavirus, none of the subject medical workers in the non-isolation wards of Taihe Hospital was found to be infected with the virus, nor was there any case of the novel coronavirus disease (COVID-19).

Example 4 Preventive Effect of Recombinant Human Interferon Formulation (Formulation 2) for Medical Workers in Isolation Wards and Fever Clinics

[0124] The interferon formulation described in the present disclosure was administrated to the medical workers who worked in an isolation ward for the hospitalization of SRAS-CoV-2 patients in a third-grade class-A hospital in Hubei Province. Comparison was performed between infection status of these medical workers with those in third-grade class-A hospitals in Hubei epidemic area, to observe the preventive effect of the formulation on novel coronavirus infection.

[0125] In this example, more than 100 medical workers who were directly exposed to infected patients in isolation wards and more than 100 medical workers who worked in fever clinics were each administrated with the α interferon nasal drop of Formulation 2 in Example 1 through nasal drip, 2-3 drops each time per nostril, four times a day, and observed for 14 days (from January 31 to Feb. 13, 2020).

[0126] The observation results showed that, during the incubation period of the novel coronavirus, none of the subject medical workers described above was found to be infected with the virus, nor was there any case of the novel coronavirus disease (COVID-19).

Example 5 Preventive Effect of Recombinant Human Interferon Formulation (Formulation 28) for Medical Workers in Isolation Wards and Fever Clinics

[0127] The interferon formulation described in the present disclosure was administrated to the medical workers who worked in an isolation ward for the hospitalization of SRAS-CoV-2 patients in a third-grade class-A hospital in Hubei Province. Comparison was performed between infection status of these medical workers with those in third-grade class-A hospitals in Hubei epidemic area, to observe the preventive effect of the formulation on novel coronavirus infection.

[0128] In this example, more than 100 medical workers who were directly exposed to infected patients in isolation wards and more than 100 medical workers who worked in fever clinics were each administrated with the α2b interferon nasal drop of Formulation 28 in Example 1 through nasal drip, 2-3 drops each time per nostril, four times a day, and observed for 14 days (from January 31 to Feb. 13, 2020).

[0129] The observation results showed that, during the incubation period of the novel coronavirus, none of the subject medical workers described above was found to be infected with the virus, nor was there any case of the novel coronavirus disease (COVID-19).

[0130] As the National Health Commission of the PRC currently recommends physical isolation measures for 2019-nCoV prevention, there are no official recommendations on prevention for 2019-nCoV by medicaments. The industry insiders believe that other third-grade class-A hospitals in the epidemic area of Hubei have not used any drug to prevent 2019-nCoV and the resulting COVID-19. From the outbreak of the epidemic to Feb. 5, 2020, there are a total of 13 hospitals where 15 or more medical workers were iatrogenically infected. As of Feb. 11, 2020, there were 3019 medical workers iatrogenically infected in Hubei Province (including confirmed, suspected and clinically diagnosed cases and asymptomatic infections, of which 1716 were confirmed cases). In addition, as described in the existing reports in Background Art, different numbers of medical workers who first came into contact with COVID-19 patients were infected in the countries around the world. An Pan et al. reported that 1496 medical workers were infected with novel coronavirus, accounting for 4.6% of the COVID-19 patients in the entire region (Reference 1, E5, Table). In February 2020, epidemiology group of emergency response mechanism for novel coronavirus pneumonia in Chinese Center for Disease Control and Prevention published a paper on the analysis of epidemiological characteristics of novel coronavirus pneumonia in the Chinese Journal of Epidemiology. This paper reported that 3019 medical workers were infected from Dec. 8, 2019 to Feb. 11, 2020, among which there are 1716 confirmed cases. (Reference 2, page 149, left column, paragraph 3). In addition, reports about infection status nationwide and among medical workers in Italy showed that 2026 health care workers were infected among 22512 COVID-19 patients in Italy (Reference 3). Thus, a certain proportion of medical workers for novel coronavirus pneumonia may be infected.

[0131] The iatrogenic infection proportion of medical workers in the third-grade class-A hospital hospitals in the epidemic area within 14 days after use of the α interferon nasal drop was zero, which was significantly lower than the infection rate of medical workers in the other third-grade class-A hospitals in the epidemic area. This unexpected result is of great significance for control of the infection.

[0132] Finally, it should be noted that the above examples are merely intended to illustrate the technical solutions of the present disclosure, but not to limit them. Although the present disclosure is described in detail with reference to the foregoing examples, those of ordinary skill in the art should understand that the technical solutions described in the foregoing examples may be modified, or equivalent substitutions may be made for some or all of the technical features; and these modifications or substitutions do not render the essence of the corresponding technical solutions to deviate from the technical scope of the examples of the present disclosure.

INDUSTRIAL APPLICABILITY

[0133] The drug and composition described in the present disclosure achieve unexpected technical effects, and no case of iatrogenic infection of SARS-CoV-2 occurs among the users within 2 weeks. Therefore, the technical solution of the present disclosure can effectively prevent SARS-CoV-2 infection, significantly reduce the infection rate of human populations and medical workers, and avoid the spread of the epidemic. The nasal formulation provided in the present disclosure can effectively maintain a relatively high concentration of interferon in the nose, and is easy to prepare, convenient to use and stable in quality. The nasal formulation can be effectively applied for the prevention of SARS-CoV-2 virus infection.