The present disclosure provides virus like nanoparticles (VLPs), which are capable of displaying multiple copies of a SARS-CoV-2 antigen, for eliciting protective immunity against a SARS-CoV-2 infection, as well as polypeptides, compositions and methods thereof.

The present invention is drawn to a next generation nano vaccine platform by using structure-based design to utilize the conserved or less variable or highly immunogenic domains or epitopes and displaying it in a nano cage and produces it in as nanoparticle protein in prokaryotic expression system. The present invention is illustrated in detail by a vaccine design and construct for SARS CoV-2, SARS-CoV-2 variants, betacorona viruses, Monkey pox virus and Dengue virus.

The present invention relates to an exosome platform-based antiviral vaccine. with the ability to induce a strong immune response to viruses and induce a stable and long-term immune response even to viruses with frequent mutations, the exosome platform-based antiviral vaccine can be utilized effectively for use as an antiviral vaccine.

A propagation-defective, replication-competent RNA replicon derived from the SARS-CoV-2 coronavirus that comprises a polynucleotide sequence SEQ_ID 2 or a variant of SEQ_ID 2 having at least 80% identity, more preferably 85% identity, even more preferably at least 90% identity, and even more preferably 91% or 92% or 93% or 94% or 95% or 96% or 97% or 98% or even up to 99% identity with respect to the SEQ_ID 2 polynucleotide sequence, wherein the variant of SEQ_ID2 does not comprise sequences suitable for expressing an ORF8 protein, wherein the ORF8 protein is encoded by a gene having at least 80% identity to the sequence of SEQ_ID36, methods of preparation thereof and the use in vaccine compositions.

The present disclosure relates to a polymer-coated virus particle for an oral virus vaccine, a method of preparing the same, and a composition comprising the same. In accordance with the present disclosure, the oral virus vaccine can be effectively delivered to the intestines without being destroyed even in the low pH environment of the gastrointestinal tract, then the prevention efficacy against viral infections can be improved.

Disclosed herein are nucleic acid constructs for producing a virus-like particle (VLP) capable of raising an immune response against severe acute respiratory syndrome coronavirus (SARS-CoV), and uses thereof, wherein the constructs comprise nucleic acid sequences encoding an immunogen and a polyprotein, wherein the polyprotein comprises two or more viral structural proteins, wherein at least two of the two or more viral structural proteins are separated by a signal peptidase sequence such that, when the polyprotein is expressed in a host cell, the signal peptidase sequence undergoes host cell peptidase-dependent cleavage to liberate the two or more viral structural proteins, thereby allowing the liberated structural proteins to self-assemble into a VLP carrying the immunogen.

The disclosure provides an animal cell stably expressing a virus-like particle (VLP). The disclosure also provides a method for manufacturing a virus-like particle, a virus-like particle, a vaccine composition, a method for preventing viral infection, and a method for producing antibodies.

An immunogenic composition effective for eliciting an immune response against cells that present coronavirus S protein and/or coronavirus M protein derived antigens on a virus-like-particle (VLP) system. In a method embodiment, the antigen presenting VLP is administered to a mammal, such as a human, to elicit an immune response against coronavirus S protein and/or coronavirus M protein. A preferred method embodiment may include at least one additional dose of immunogenic composition to enhance the immune response effectiveness of the coronavirus vaccine.

Provided herein are SARS-CoV-2 virus-like particles as well as methods and compositions for generating SARS-CoV-2 virus-like particles. The SARS-CoV-2 virus-like particles can load and deliver transcripts (including engineered transcripts that can include therapeutic agents) into cells expressing SARS-CoV-2 entry factors. The SARS-CoV-2 virus-like particles are also useful for detecting immune response in antibodies from subjects.

The present disclosure relates to modified coronavirus S protein and virus-like particles (VLPs) comprising modified coronavirus S protein. The present invention also relates to methods of increasing the purity, and/or stability of coronavirus S protein or VLPs comprising modified coronavirus S protein in a host or host cell.