LONG PROTECTION MOSQUITO REPELLENT OINTMENT

Abstract

The invention relates to an ointment comprising shea butter, petrolatum, beeswax, perfume and 10 to 20% by weight of DEET based on the total weight of the ointment, providing a protection against mosquitoes for at least 7 hours, its uses as a mosquito repellent and for the prevention of diseases such as malaria, and its manufacturing process.

Claims

1.-14. (canceled)

15. Mosquito repellent ointment comprising petrolatum, shea butter, oil, beeswax, perfume and from 10 to 20% by weight of DEET based on the total weight of the ointment, providing a protection against mosquitoes for at least 7 hours.

16. Mosquito repellent ointment according to claim 15 providing protection against mosquitoes for about 8 to 10 hours.

17. Mosquito repellent ointment according to claim 15 comprising between 25 to 65% by weight of petrolatum based on the total weight of the ointment.

18. Mosquito repellent ointment according to claim 15 comprising between 10 to 45% by weight of shea butter based on the total weight of the ointment.

19. Mosquito repellent ointment according to claim 15 comprising between 1 to 5% by weight of beeswax based on the total weight of the ointment.

20. Mosquito repellent ointment according to claim 15 comprising between 0 to 2 by weight of perfume based on the total weight of the composition.

21. Mosquito repellent ointment according to claim 15 comprising between 1 to 10% by weight of oil based on the total weight of the ointment.

22. Mosquito repellent ointment according to claim 15 wherein the oil is chosen amongst vegetal oils, mineral oils or their combination.

23. Mosquito repellent ointment according to claim 22 wherein the oil is cotton seed oil.

24. Mosquito repellent ointment according to claim 15 comprising 47% by weight of petrolatum, 30% by weight of shea butter, 15% by weight DEET, 4.5% by weight of cotton seed oil, 3% by weight of beeswax, 0.5% by weight of perfume based on the total weight of the ointment.

25. Mosquito repellent ointment according to claim 15 for its use in the prevention of diseases transmitted by mosquitoes.

26. Mosquito repellent ointment according to claim 25 wherein the mosquitoes belong to the genus Anopheles and/or Aedes.

27. Mosquito repellent ointment according to claim 25 wherein the disease transmitted by mosquitoes is chosen amongst malaria, dengue, chikungunya, Zika and yellow fever.

28. Manufacturing process of the mosquito repellent ointment according to claim 15 comprising at least the following steps: i) mixing all the fats together, ii) heating the mixture up to melting point under continuous agitation, iii) adding DEET and optionally perfume, and iv) maintaining agitation between 5 minutes to an hour, preferably 5 to 30 minutes, most preferably between 5 to 10 minutes.

Description

FIGURES

[0102] FIG. 1 is a diagram showing the percentage of repellency of 20% DEET and an ointment according to the invention, both indoor and outdoor.

[0103] FIG. 2 is a diagram showing the probability of no mosquito landing according to the treatment.

[0104] FIG. 3 is a diagram showing the probability of no mosquito landing according to the treatment (indoor).

[0105] FIG. 4 is a diagram showing the probability of no mosquito landing according to the treatment (outdoor).

[0106] FIG. 5 is a diagram showing the probability of no mosquito An. gambiae landing according to the treatment in Example 2.

[0107] FIG. 6 is a diagram showing the probability of no mosquito An. arabiensis landing according to the treatment in Example 2.

[0108] FIG. 7 is a diagram showing the probability of no mosquito Aedes aegypti landing according to the treatment in Example 2.

EXAMPLES

[0109] In the following description, the examples are provided for illustrative purposes only and are not intended to limit the scope of the invention.

[0110] Example 1-Formulation Assays

[0111] Ten compositions according to the invention have been prepared and tested to determine the best composition. Briefly, the various ointments have been prepared according to the following steps:

[0112] (i) weighing each ingredient according to the proportions indicated in Table 1,

[0113] (ii) mixing all the fats (petrolatum, shea butter, cotton seed oil or petrolatum oil, beeswax) in a blender,

[0114] (iii) heating the mixture up to 65° C. under continuous agitation until a homogeneous mixture is obtained.

[0115] (iv) adding DEET and perfume once the mixture is homogeneous, and

[0116] (v) maintaining agitation for at least five to ten minutes to homogenize the mixture.

[0117] The proportions of each ointment according to the invention is detailed in Table 1 below.

TABLE-US-00001 TABLE 1 Ingredients Ointment 1 Ointment 2 Ointment 3 Ointment 4 Ointment 5 Shea Butter 13 13 20 20 30 (CAS 194043-92-0) Petrolatum 61 61 54 54 44 (CAS 8009-03-8) DEET 15 15 15 15 15 (CAS 134-62-3) Beeswax 6 6 6 6 6 (CAS 8012-89-3) Cotton seed oil 4.5 0 4.5 0 4.5 (CAS 8001-29-4) Petrolatum oil 0 4.5 0 4.5 0 Perfume 0.5 0.5 0.5 0.5 0.5 Total (g) 100 100 100 100 100 Ingredients Ointment 6 Ointment 7 Ointment 8 Ointment 9 Ointment 10 Shea Butter 30 45 245 30 47 (CAS 194043-92-0) Petrolatum 44 29 29 47 30 (CAS 8009-03-8) DEET 15 15 15 15 15 (CAS 134-62-3) Beeswax 6 6 6 3 3 (CAS 8012-89-3) Cotton seed oil 0 4.5 0 4.5 0 (CAS 8001-29-4) Petrolatum oil 4.5 0 4.5 0 4.5 Perfume 0.5 0.5 0.5 0.5 0.5 Total (g) 100 100 100 100 100

[0118] The purpose is to obtain a monophasic ointment which is not runny or lumpy, in order to obtain a nice texture that is appreciated by the users and provides a homogenous coverage once applied on the skin. The homogeneity of the coverage is important in order to provide an even protection against mosquitoes.

[0119] Formulations 1 and 2, which formulation is dose to the formulation of the former ointment MAÏA®, are runny and lumpy. Formulations integrating cotton seed oil rather than petrolatum oil provides a better consistency. Beeswax in a proportion of 3% provide a monophasic ointment and holds the shea butter and petrolatum together.

[0120] The best formulation in terms of consistency and texture is ointment No. 9.

[0121] Example 2— Protection and Repellency Assay No. 1

[0122] The protection time provided by ointment No. 9 of Example 1 has been measured according to the “Guidelines for efficacy testing of mosquito repellents for human skin” published by the World Health Organization in 2009 (noted hereafter “WHO Guidelines, 2009”). These guidelines describe how human landing catches must be performed on volunteers. The effectiveness of ointment No. 9 was evaluated and compared to a 20% ethanol solution of DEET (N, N-Diethyl-3-methylbenzamide), being the positive control, and an ethanol solution being the negative control.

[0123] More specifically, ointment No. 9 comprises 47% by weight of petrolatum, 30% by weight of rhea butter, 15% by weight DEET, 4.5% by weight of cotton seed oil, 3% by weight beeswax and 0.5% by weight of perfume based on the total weight of the ointment.

[0124] Briefly, the study was carried out in real conditions at the Goden village (12°25′N, 1°20′W), a rural village in the locality of Gampela, 25 km north-east of Ouagadougou, is the capital city of Burkina Faso. Goden is in the Sudanian Savanna with approximately 800 inhabitants mainly belonging to the Mossi ethnic group, mostly devoted to agriculture and rearing few animals such as dogs, pigs and others. Goden is known for its high density of malaria vectors due to its proximity to the Massiri river. This study was carried out during the high malaria transmission period, when the mosquito density was the highest A preliminary assessment of the collection site was carried out by undertaking captures on human volunteers before the tests themselves.

[0125] A total of twenty volunteers have been recruited from the Goden village and have been trained for the nocturnal collection of mosquitoes on human bait using mouth aspirator and flash torch known as Human Landing Catches (HCL). The age of the volunteers ranged from 18 to 50 years old. After receiving explanation of the aims, benefits and risks of the study, they signed a written informed consent. The composition of the ointment was not disclosed to the volunteers. Volunteers were instructed not to use any fragranced soap or perfume, tobacco or alcohol 12 hours before the start and throughout the experiments, Before applying treatments, the lower leg of volunteers was washed with neutral soap, rinsed with 70% of ethanol solution and naturally dried. Once their legs treated volunteers were also asked to avoid rubbing, touching or wetting the repellent-treated area.

[0126] Three treatments have been carried out in the study:

[0127] (i) one negative control (ethanol 100%),

[0128] (ii) two treatments of 20% DEET diluted in ethanol 100% of technical quality used as a positive control, since this repellent is considered as the reference,

[0129] (iii) two treatments of ointment No. 9.

[0130] The products were applied to the bare leg of the volunteers and the areas of application were exposed to mosquito bites in the field. Volunteers applied to their exposed leg: Ointment No. 9 at a dosage of 2 mg/cm.sup.2, and 20% DEET in ethanol for the positive control at a dosage of 1 ml per 600 cm.sup.2.

[0131] To establish the amount of repellent required for application in the experiments, the surface area of the leg of each volunteer were determined by first measuring the circumferences expressed in centimeter (cm) just below the knee, and above the ankle, multiplied by the length of the lower leg, measured from the knee to the ankle. The surface area (in cm.sup.2) of skin was calculated according to formula (1) below:

Area=½(Ck+Ca)Dka,  (1)

wherein Ck is the circumference below the knee in cm, Ca is the circumference above the ankle in centimeter, and Dka is the distance in centimeter between Ca and Ck. The amount needed for each volunteer was then determined depending on their leg length. In addition, the quantity of product left in bottles was weighed using a precision weighing balance (KERN & SOHN GmbH) to determine the amount applied by each volunteer. Overall, the average amount applied was 2.4±0.2 g per 1189±79.2 cm.sup.2 and per volunteer's lower leg, leading to 2 mg/cm.sup.2 of Ointment No. 9 and 2±0.1 mL/cm.sup.2 of a 20% DEET solution.

[0132] Volunteers were divided into five groups of four volunteers. All the members of a group received the same treatment at the same time. Thirty minutes after applying the treatment, the group were assigned to one of five houses that were at least 20 meters apart, as recommended in the WHO Guidelines (WHO Guidelines, 2009), in order to avoid biases due to competition in attractiveness to the mosquitoes. Except for the treated lower leg, the whole body was fully protected from mosquito bites. Each volunteer wore a long-sleeved shirt, buttoned at the wrist, long trousers, closed shoes and latex gloves with a hat on the head. The trousers of the treated leg were rolled to the knee exposing only the lower legs to biting mosquitoes.

[0133] For each house, one member of the pair was collecting indoor and the other outdoor alternately every hour from 6 pm to midnight. A second pair continued from midnight to 6 am. During an exposure period volunteers were sat on a chair and collected any mosquito landing on the exposed lower leg. Collected insects were transferred into plastic caps covered with a net and a small hole at the bottom to allow mosquitoes to be easily aspirated into them. As with the treatment allocation, the sequence of rotation between the positions followed a Williams balanced Latin Square design and was randomly assigned to the study participants at the beginning of each session by drawing lots. The mosquitoes were collected from 6 pm to 6 am the next morning. After collection, mosquitoes were morphologically identified using a stereo microscope and the identification keys (Gillies, M. T. and B. DeMeillon, The Anophelinae of Africa South of the Sahara (Ethiopian zoogeographical region), 968, Johannesburg: South African Institute for Medical Research).

[0134] All data have been collected on standard forms and were entered twice in a database by different persons. Databases have been compared using Epi Info™ 3.5.3, and inconsistencies were verified using the printed and corrected forms. The performance of the repellent was measured by calculating the repulsive efficiency and the median full protection time.

[0135] The repulsive efficacy was calculated as a percentage of repulsion (% R) according to the formula (2) below:

%R=((C−T)/C)×100,  (2)

where C is the average number recaptured on the control volunteer's lower limbs, and T is the total number of stinging mosquitoes on the legs of volunteers treated either with the test product or the positive control (WHO Guidelines, 2009).

[0136] The complete protection time (CPT) was defined as the time interval between the beginning of the collection/test and the first mosquito landing. To estimate the median complete protection time (CPT) of each treatment, a Kaplan-Meier survival analysis was meant to be performed for each vector species. However, this analysis was performed only on Anopheles only as constituted ˜99% of the total collection. Data analysis was done using the ‘survival package’ from R software-version 3.5.0 (update of 2018 Apr. 23). A Generalized Linear Mixed Model was used to further analyse the effect of the location (indoor versus outdoor) on the performance of the treatments. Any variation in the average number of bites received between treatment has also been assessed.

[0137] No side effects were observed or reported by any of the volunteers throughout the entire test period. A toxicological evaluation of the ointment according to the invention has been carried out and the evaluation indicated that ointment No. 9 could be used without age limit.

[0138] Mosquitoes Diversity

[0139] A total of 3.979 mosquitoes, stratified by treatment and species (Table 1) were caught during the tests. Mosquitoes of the genus Anopheles formed 98.5% of the total catch, with mosquitoes of the culicine (Aedes) making up the remaining 1.5%. Among Anopheles mosquitoes, 95% belonged to An. gambiae complex, followed by An. funestus, and An. pharoensis. The frequency of mosquitoes landing on the treated collectors, compared with the control subjects, varied according to the repellent used as shown by Table 1 below:

TABLE-US-00002 TABLE 1 Treatment 20% Ointment Mosquito’s species DEET Ethanol No. 9 Anopheles gambiae sensu lato (s.l.) 686 2660 480 Anopheles funestus  1   2  1 Other Anopheles  1   9  3 Culicine  7  106  23

[0140] The hourly mosquitoes biting rate varied significantly between treatments (df=2, X.sup.2 =426.22, p<0.0001). An average of 0.68 (95% Cl: 0.51-0.91) mosquito bites was received per person per hour compare to 1.01 (95%: 0.76-1.33) for 20% DEET and 8.98 (95% Cl: 6.56-12.29) for ethanol. In addition, there was no variation between treatment according to the location (df=2, x.sup.2=1.703, p=0.42). Overall, the ratio outdoor: indoor biting 1.26 (95% Cl: 1.25-1.27) indicates that more biting was taking place outdoor compare to indoor (df=1, .sub.X.sup.2=5.79, p=0.016).

[0141] Repellency Against Mosquitoes

[0142] Because Anopheles gambiae s.l. was the most abundant species (96.15%) the repellency calculation was focus on this species. The repellency against Anopheles gambiae s.l. was stratified by time of collection. From 18 h to 00 h (6 hours after the application), the percentage of repellency varied from 100% to 90% for ointment No. 9 and 20% DEET (the standard repellent reference). Between 00 h to 03 h (9 hours after application), the percentage was between 90% and 80%. After 3 h (10 hours after application), this percentage was under 80% for 20% DEET but ointment No. 9 was still over 80%. Ointment No. 9 gave a high percentage of repellency but no difference in repellency was observed between 20% DEET and ointment No. 9 during the first 9 h after their applications.

[0143] When the data were stratified by location of the mosquito's biting, the trend was the same indoor and outdoor. No difference during the 9 first hours between ointment No. 9 and 20% DEET has been shown, as shown on FIG. 1 and table 2 below:

TABLE-US-00003 TABLE 2 A - Anopheles gambias sl B - Anopheles gambias sl (indoor) (outdoor) 20% Ointment 20% Ointment DEEt Ethanol No. 9 DEET Ethanol No. 9 Median 480 60 480 480 120 450 CPT Lower 440 <60 440 447 95 428 CI Upper 521 NA 521 513 145 472 CI

[0144] Therefore, these results demonstrate that ointment of the invention, such as ointment No. 9, are effective to protect both indoor and outdoor.

[0145] Complete Protection Time

[0146] The complete protection time is estimated from the time elapsed up to the first mosquito landing and/or probing in each replicate. The median CPT and its confidence interval were estimated using the Kaplan—Meier survivor function procedure. The median CPT of 20% DEET and ointment No. 9 were estimated at 480 minutes again 120 minutes for the negative control.

[0147] When the CPT is considered for outdoor collections, the median CPT vias respectively 480 minutes for 20% DEET and ointment No. 9, and 120 minutes for Control. For indoor collections, these estimates were 480, 450 and 60 minutes respectively for 20% DEET, ointment No. 9 and Ethanol.

[0148] Statistical analyses showed there was no difference in the median CPT between 20% DEET and ointment No. 9 (df=1, X.sup.2=0.2, p=0.7). However, there was a significant difference between median CPT from ointment No. 9 and the Control (df=2, x.sup.2=106, p<0.0001, FIG. 2). Even when the collection was stratified by location, this difference still occurred in both indoor (FIG. 3; df=2, x.sup.2=41.6, p<0.0001) and outdoor collections (FIG. 4; df=2, X2=66.7, p<0.0001). The protection time increased by four-fold when comparing both ointment No. 9 and 20% DEET to Ethanol (Table 3),

TABLE-US-00004 TABLE 3 Anopheles gambiae s.l. 20% Ointment DEET Ethanol No. 9 Median CPT 480 120 480 Lower Cl 454  91 448 Upper Cl 506 149 512

[0149] Example 3— Protection and Repellency Assay No. 2

[0150] The study was conducted under ambient condition in the semi-field system (SFS) located in Bagamoyo district at the Ifakara Health Institute at Bagamoyo branch in Tanzania. Bagamoyo is located on the coast region of the Indian Ocean between latitudes 6° and 8′ South and between longitudes 30° and 37′ East. The district experience annual rainfall ranging between 800 mm and 1000 mm, temperature ranging between 22° C. and 33° C., and mean relative humidity of 73%.

[0151] Three laboratory-reared mosquito strains, aged 6 days old, sugar starved for 8 hours, nulliparous females, reactive to human odor on the day of the experiment, have been used for this experiment. Mosquito strains used were: (i) the pyrethroid insecticide resistant (20% mortality) An. arabiensis (Kingani, (ii) fully pyrethroid susceptible An. gambiae s.s. (Kisumu) and (iii) Ae. aegypti (Bagamoyo). The vector control product-testing unit of IHI supplied all mosquitoes used in the experiments.

[0152] The mosquitoes were reared in the insectary following MR4 guideline (MR4. Methods in Anopheles Research 2016;2015 Edition). Adults were kept inside cages measuring 30 cm×30 cm×30 cm. Only hyperactive mosquitoes were selected at least 8 hours before the experiment. An. arabiensis were coloured using a fluorescent dye that did not affect their fitness nor host preference. About 30 minutes before the experiment, mosquitoes were transferred to the SFS to acclimatize the environmental conditions. The SFS offered the following advantages; 1) volunteers were exposed to laboratory-reared mosquitoes only, 2) experiments were run using a known number of mosquitoes throughout the experiments; 3) mosquitoes used were of known age (6 days), physiological status and avidity. These features improve data quality and less results variability between days and volunteers.

[0153] Three treatments have been tested: (i) Ethanol 100% as a negative control, (ii) 20% DEET diluted in ethanol 100% as a positive control, and (iii) ointment No. 9.

[0154] Volunteers wore shorts, closed shoes and bug jacket to ensure mosquitoes had access to the lower limbs only. Volunteers applied 20% DEET and ointment No. 9 at an average rate of 2 mg/cm.sup.2 of the repellent to the lower limbs using latex glove to minimize absorption onto volunteer's hand. After application, an empty plastic cups were weighed to determine the quantity of repellent left in the cup. The composition of the ointment was not disclosed to the volunteers.

[0155] The study was divided into two experiments: one for Anopheles mosquitoes conducted in the late evening and the other for Ae. aegypti mosquitoes conducted early in the morning. The experiment for Anopheles started at 17:55 and that for Ae. aegypti at 06:00 hours.

[0156] The experiments were conducted for a total of 18 days. During the first 9 days 100 mosquitoes (50 per species) were released in each compartment starting at 18:00 hours for Anopheles species and at 06:00 hours for Ae. Aegypti. After the release, the number of mosquitoes recaptured by volunteers who applied 20% DEET and ointment No. 9 was insignificant up to 6 hours of recapture period. This warranted to extend the recapture period to 12 hours 9 last days.

[0157] During the last 9 days, we used same volunteers, compartments and rotation schedule. Mosquitoes released were 100 per species and volunteers recaptured mosquitoes landing on their lower limbs using a mouth aspirator up to 12 hours of recapture period. Volunteers recorded a time the first mosquito of each species landed on the limb and the recaptured mosquito was placed in a paper cup labelled with volunteers unique identification code, time of collection, position and treatment code. The volunteer kept collecting subsequent mosquitoes up to 12 hours with cups changed after every hour.

[0158] At the end of recapture time, mosquitoes were killed by putting in the refrigerator for about 30 minutes and then sorted to species level. If the mosquito recaptured in the control was below 50 percent, the experiment was considered invalid, data discarded and the experiment repeated. In addition, information about environmental condition such as temperature, relative humidity and wind speed on the day of experiment were recorded in the data sheet.

[0159] Data analyses were performed in Stata 15.1 (State Corp, USA). Descriptive analyses were carried out using mosquitoes recaptured as a primary outcome and the overall recapture rates per treatment was established.

[0160] The protective efficacy of each treatment was established for the data collected up to 12 hours and the percentage protective efficacy was calculated using formula (2).

[0161] The average complete protection time (CPT) for each treatment was established and reported in minutes. A Kaplan-Meier survival analysis curve was established for each mosquito species against 20% DEET and Ointment No. 9.

[0162] The statistical analyses were performed using a mixed effects binomial logistic regression to compare the protective efficacy between 20% DEET and Ointment No. 9. Mosquitoes recaptured after the release in the compartments were modelled as a function of species, treatment, hour of collection and/or position of the volunteers. The 20% DEET was used as a reference in the model. Several models were tested and the best model was determined using the Aikaike's Information Criterion (AIC), The final model selected was the model with the smallest AIV value.

[0163] During the 6-hour recapture time, both Ointment No. 9 and 20% DEET provided 100% protective efficacy for all species tested (results not shown). During the 12-hour recapture time, both Ointment No. 9 and 20% DEET provided above 93% protective efficacy for all species tested (table 4). The protective efficacy of Ointment No. 9 against An. gambiae s.s, (Kisumu), was 95.9% (95% Cl: 95.4-96.3) and 20% DEET was 96.8% (95% CI: 96.3-97.3). The protective efficacy of Ointment No. 9 against An. arabiensis (Kingani) was 97.4% (97.1-97.6) and 20% DEET was 97.2% (96.9-97.4). The protective efficacy of Ointment No. 9 against Ae. Aegypti was 94.6% (93.8-95.4) and 20% DEET was 93.1% (92.2-94.1). In a statistical model comparing Ointment No. 9 to 20% DEET, the results indicated that Ointment No. 9 and 20% DEET have comparable protective efficacy (Table 4 below) with no statically significant difference between them against An. gambiae OR=1.53 [0.89-2.66] p=0.128, An. arabiensis OR=1.08 [0.57-2.04] p=0.809 and Ae. aegypti OR=0.72 [0.32-1.59] p=0.418,

[0164] Both Ointment No. 9 and 20% DEET have comparable complete protection time (CPT) as table 4 below. The average CPT of Ointment No. 9 was 571.6 (95% Cl: 558.3-584.8) while CPT of 20% DEET was 575.0 (95% CI: 562.1-587.9) against An. gambiae (Kisumu), as shown by FIG. 5. For An. arabiensis (Kingani), CPT of Ointment No. 9 was 585.6 (95% Cl: 571.4-599,8 while CPT of 20% DEET was 580.9 (95% CI: 571.1-590.7), as shown by FIG. 6. For an Ae. Aegypti, CPT was 444.1 (95% CI: 401.8486.5) while CPT of 20% DEET was 436.9 (95% CI: 405.2-468.5), as shown by FIG. 7.

TABLE-US-00005 TABLE 4 Percentage Percentage protection and Odds Z P Average CRT Test systems Test items recapture 95% CI Ratio value value 95% CI and 95% CI An. gambiae s.s 20% DEET 2.5% 96.8% 1 — — — 575 (Kisumu) (31/1258) (96.3-97.3) (562.1-587.9) MAÏA ® 3.9% 95.9% 1.53 1.52 0.128 0.89-2.66 571.6 Ointment (49/1258) (95.4-96.3) (558.3-584.8) Absolute 93.6% — 62.63 20.68  0.000 42.31-92.70 — Ethanol (1178/1258) An. arabiensis 20% DEET 2.7% 97.2% 1 — — — 580.9 (Kingani) (36/1357) (96.9-97.4) (571.1-590.7) MAÏA ® 3% 97.4% 1.08 0.24 0.809 0.57-2.04 585.6 Ointment (40/1357) (97.1-97.6) (571.4-599.8) Absolute 94.4% — 58.93 18.68  0.000 38.43-90.38 — Ethanol (1281/1357) Aedes aegypti 20% DEET 4.8% 93.1% 1 — — — 436.9 (38/800) (92.2-94.1) (405.2-468.5) MAÏA ® 6% 94.6% 0.72 −0.81  0.418 0.32-1.59 444.1 Ointment (48/800) (93.8-95.4) (401.8-486.5) Absolute 89.3% — 11.56 8.57 0.000  6.61-20.23 — Ethanol (714/800)

[0165] As shown by Example 3, Ointment No. 9 is as effective as the positive control to repel mosquito belonging to the Aedes and Anopheles genus. More specifically, Ointment No. 9 provides at least 7 hours of protection against Aedes mosquitoes and at least 9 hours of protection against Anopheles mosquitoes.

[0166] In summary, the assays show that mosquito repellent ointments according to the invention are effective to repel mosquitoes, especially mosquitoes from the genus Anopheles and Aedes that are the vectors of the plasmodium responsible for malaria as well as other diseases such as dengue, chikungunya, Zika and yellow fever. More specifically, the assays show that ointments according to the invention provides protection for at least 7 hours, more specifically between 8-10 hours, against mosquitoes responsible for life-threatening diseases. Also, the ointment of the invention provides a longer protection than the existing repellent, especially the old formulation MAÏA®, and allows a protection for a complete night, unlike the conventional mosquito repellents on the market which provide protection for only 5-6 hours.

[0167] Therefore, mosquito repellent ointments according to the invention can be successfully used for the prevention of malaria as well as other diseases such as dengue, chikungunya, Zika and yellow fever.