RESUMO
Since 2008, several outbreaks of yellow fever and dengue occurred in Abidjan, the economic capital of Côte d'Ivoire. A better knowledge of the biology of Aedes aegypti populations, the main vector of yellow fever and dengue viruses, is necessary to tailor vector control strategies implemented in the city. This study was designed to determine some biological parameters, occurring during the life cycle of two morphological phenotypes of Ae. aegypti larvae. Mosquitoes were sampled in a suburb of Abidjan (Treichville) using the WHO layer-traps technique. Biological parameters were studied in laboratory under standard conditions of temperature (27°C ± 2°C) and relative humidity (80% ± 10%). Our results indicated that the mean eggs laid by females from 'brown larvae' (BL) (85.95, 95% confidence interval (CI 95%) 78.87-93.02) was higher than those from 'white larvae' (WL) (64.40%, CI 95% 55.27-73.54). The gonotrophic cycle was 3 and 4 days in females from BL and WL, respectively. The overall yield of breeding mosquitoes from BL (63.88%, CI 95% 62.61-65.14) was higher compared with those of mosquitoes from WL (59.73%, CI 95% 58.35-61.12). The sex ratio (male/female) was 0.95 and 1.68 in Ae. aegypti populations from BL and WL, respectively. Females from BL lived slightly longer than those from WL (t = -2.332; P = 0.021). This study shows that Ae. Aegypti populations from BL and WL present different biological parameters during their life cycle. This could have an implication on their ability to transmit human disease viruses such as dengue and yellow fever. Further molecular studies are needed to determine genetic divergence between these Ae. aegypti populations.
Assuntos
Aedes/fisiologia , Aedes/anatomia & histologia , Aedes/crescimento & desenvolvimento , Animais , Côte d'Ivoire , Feminino , Fertilidade/fisiologia , Larva/anatomia & histologia , Larva/crescimento & desenvolvimento , Larva/fisiologia , Longevidade/fisiologia , Masculino , Oviposição/fisiologia , Fenótipo , ReproduçãoRESUMO
The response to HIV must be based on all situations of risk and vulnerability related to sexual behavior. Sexual practices of women who have sex with other women to HIV described in his study come within this framework. This transversal and descriptive study on the sexual practices of 150 women who have sex with other women to HIV was conducted from July to September 2010 in Abidjan. Mean age of the respondents was 26.6 years. Among them, 21.3% was illiterate, 41.4% had no earned income and 57.3% was Christians. At the time of data collection, the majority (70.7%) did not know their HIV status. The analysis of sexual practices has found 13.3% of lesbians, bisexual, 36% and 50.7% of women who say they are lesbian even if they have had sex with men. Women who have sex with other women had sexual risk behavior. It was mostly the non-systematic use of the condom during sexual relation (60%). Among the 26.7% of respondents who had lesbian practices with penetration, 40% took no precaution to prevent HIV and other sexually transmitted infections. Taking into account these results could help to develop specific strategies to promote responsible sexual practices among women who have sex with other women.
Assuntos
Infecções por HIV/transmissão , Comportamento Sexual/estatística & dados numéricos , Mulheres , Adolescente , Adulto , Consumo de Bebidas Alcoólicas/epidemiologia , Bissexualidade/estatística & dados numéricos , Côte d'Ivoire/epidemiologia , Estudos Transversais , Escolaridade , Feminino , Infecções por HIV/epidemiologia , Homossexualidade Feminina/estatística & dados numéricos , Humanos , Renda/estatística & dados numéricos , Ocupações/estatística & dados numéricos , Religião , Fumar/epidemiologia , Transtornos Relacionados ao Uso de Substâncias/epidemiologia , Sexo sem Proteção/estatística & dados numéricos , Adulto JovemRESUMO
In April 2008, seven years after the outbreak of 2001, Abidjan faced another epidemic of yellow fever. Three weeks after the case detected in the commune of Treichville at 28(th) of April 2008, two other cases were notified, the first one in Port-Bouet and the second one in Cocody located respectively in the south and north of the city of Abidjan. In order to determine a large-scale risk of urban yellow fever epidemic, epidemiological and entomological investigations were conducted by the Ministry of Health and Public Hygiene of Cote d'Ivoire with the support of the Global Outbreak Alert and Response Network. Entomological investigations revealed the predominance of Aedes ægypti, urban vector of yellow fever in neighborhood visited with larval density indices between 2 and 5, indicating the existence of a sufficient density of the vector for cause an explosion of the epidemic. In fact, the massive influx of people from inside cities towards Abidjan caused by the socio-political crisis occurred in the country in 2002, the deterioration of environment with the creation of more breeding sites of Ae. ægypti as corollary and the circulation of the virus at mosquito level were many factors favorable to the yellow fever outbreak in Abidjan city.
Assuntos
Surtos de Doenças/estatística & dados numéricos , Febre Amarela/epidemiologia , Aedes , Animais , Côte d'Ivoire , Feminino , Humanos , Masculino , Densidade Demográfica , Medição de Risco , Saúde da População UrbanaRESUMO
This survey, conducted from July 2003 to June 2004, was to assess the variation of the level of sensitivity of Cx. quinquefasciatus to the pyrethroids recommended for the impregnation of the mosquito nets, in the township of Yopougon situated in the Northwest of Abidjan city in relation with the bed of a drainage channel of sewage water that passes through the township from the north to the south. Five districts have been chosen along this channel according to the level of urbanization, for the withdrawal of the pre-imaginal populations of Cx. quinquefasciatus in collections of stagnant sewage water of this township. The female Cx. quinquefasciatus aged three to five days from the exits of the insectarium have been exposed to papers impregnated with deltamethrin 0.05%, permethrin 1% and DDT 4% in view of the diagnosis of a possible resistance of these populations to these insecticides. The populations of Cx. quinquefasciatus proved to be resistant to the three insecticides used, in four districts. On the other hand, the population of Cx. quinquefasciatus from the district "Zone industrielle," situated upstream of the channel, proved to be sensitive to permethrin 1%, and a drastic decrease of sensitivity of the same mosquito has been observed with deltamethrin 0.05% and DDT 4%.
Assuntos
Culex/efeitos dos fármacos , Resistência a Inseticidas/efeitos dos fármacos , Inseticidas/farmacologia , Esgotos , Urbanização , Animais , Cidades/estatística & dados numéricos , Côte d'Ivoire , Culex/crescimento & desenvolvimento , Avaliação Pré-Clínica de Medicamentos , Ecossistema , Feminino , Humanos , Controle de Mosquitos/métodos , Controle de Mosquitos/estatística & dados numéricos , Nitrilas/farmacologia , Piretrinas/farmacologia , Esgotos/parasitologia , Água/parasitologiaRESUMO
An assessment of the sensitivity of Anopheles gambiae s.l.to three pyrethroids (alphacypermethrin, permethrin, deltamethrin) and DDT has been carried out with a laboratory strain (Kisumu reference sensitive strain) and a wild strain (Tiassalékro strain) using larvae from an irrigated rice-growing area of Tiassalékro, located in the southern forest of Ivory Coast. The sensitivity tests were performed according to the standard WHO cylinder tests with adult female A. gambiae s.l. aged 2 to 4 days. The results showed that the strain of Tiassalékro is resistant to the three tested pyrethroids and DDT. The molecular forms M and S were identified, with a predominance of M form. The resistance mechanism involved is the Kdr mutation. In this region, control measures against malaria vectors by using bed nets impregnated with these insecticides or household sprays could be compromised.
Assuntos
Anopheles , DDT , Resistência a Inseticidas , Inseticidas , Piretrinas , Irrigação Agrícola , Animais , Anopheles/genética , Côte d'Ivoire , Resistência a Inseticidas/genética , Larva , Mutação , Oryza/crescimento & desenvolvimentoRESUMO
Buruli ulcer is currently a major public health problem in Côte d'Ivoire. It is a neglected tropical disease closely associated with aquatic environments. Aquatic insects of the Hemiptera order have been implicated in human transmission of Mycobacterium ulcerans, the pathogenic agent of Buruli ulcer. The purpose of this preliminary study using the polymerase chain reaction (PCR) method was to evaluate aquatic insects in Sokrogbo, a village in the Tiassalé sanitary district where Buruli ulcer is endemic. Findings identified two water bugs hosting Mycobacterium ulcerans, i.e., one of the Micronecta genus in the Corixidae family and another of the Diplonychus genus in the Belostomatidae family. The PCR technique used revealed the molecular signatures of M. ulcerans in tissue from these two insects. Based on these findings, these two water bugs can be considered as potential hosts and/or vectors of M. ulcerans in the study zone. Unlike Diplonychus sp., this is the first report to describe Micronecta sp as a host of M. ulcerans. Further investigation will be needed to assess the role of these two water bugs in human transmission of M. ulcerans in Côte d'Ivoire.
Assuntos
Úlcera de Buruli/microbiologia , Úlcera de Buruli/transmissão , Vetores de Doenças , Hemípteros/microbiologia , Mycobacterium ulcerans , Animais , Côte d'Ivoire , Feminino , Humanos , Masculino , Adulto JovemRESUMO
In November 2009, ten suspicious cases of yellow fever, including six deaths, were notified in the region of Denguélé, in the northwest of Côte-d'Ivoire. In order to evaluate the extent of yellow fever virus circulation and the risk for local people, a mission of entomological investigation was carried out by the Ministry of Health and Public Hygiene of Côte-d'Ivoire. Entomological investigations were conducted in the villages of confirmed cases (Banakoro and Tron-Touba) and the centers of consultation and hospitalization of cases during illness. Breteau index and recipient index were quasi nil. Aedes aegypti was absent among the captured mosquitoes. On the other hand, Aedes luteocephalus and Aedes opok were present at Banakoro and Tron-Touba with respective average biting rates of 0.8 and 0.6 bite/man/twilight. This situation of epidemic in the northwest of Côte-d'Ivoire could be explained by the deterioration of Denguélé region's health system which is a consequence of the war started in the country in 2002 and which has lowered the immunity of the population.
Assuntos
Aedes , Culex , Insetos Vetores , Febre Amarela/transmissão , Animais , Côte d'Ivoire/epidemiologia , Feminino , Humanos , Mordeduras e Picadas de Insetos/epidemiologia , Masculino , Guerra , Febre Amarela/epidemiologiaRESUMO
Entomological surveys were undertaken between June and December 2006 in N'gatty and Allaba. These villages are located in southern Ivory Coast in a laguna area in Dabou department. In these villages, there are large swampy areas, which have caused the multiplication of anthropophilic Culicidae. Mosquitoes have been collected at preimaginal stage at the time of the larval prospecting and at adult stage through human landing catch. Larval collections have been made using the classic method of "dipping". Larvae have been identified to the genus level. Then, they have been bred in the laboratory to identify adults. Adults collection has been made once a month during three consecutive nights by human landing catch inside houses. Adults have been identified to the specific level. Eight genera of mosquitoes have been collected in these two villages: Aedes, Anopheles, Coquillettidia, Culex, Eretmapodites, Mansonia, Toxorhynchites and Uranotaenia. Twenty-four species have been listed during this stu y. The genus Mansonia is the most predominant with 86% (N = 15,811) and 80% (N = 1,385), respectively, in N'gatty and Allaba. The average biting rate per day varies between N'gatty and Allaba. It is estimated to 308 bites per human per night (b/h/n) in N'gatty and 72 b/h/n in Allaba. In these villages, mosquito nuisance is mainly due to Mansonia with 264 b/h/n and 58 b/h/n, respectively, in N'gatty and Allaba. However, Anopheles gambiae s.l. average rate was 12 b/h/n in N'gatty and 2 b/h/n in Allaba.
Assuntos
Culicidae , Animais , Biodiversidade , Côte d'Ivoire , Estudos Transversais , Água Doce , Densidade DemográficaRESUMO
In April 2008, Abidjan was again faced with another case of yellow fever after the epidemic of 2001 causing mass immunization campaign. In order to evaluate the extent of amaril virus circulation and the risk for local people, an entomological investigation was carried out by the Ministry of Health and Public Hygiene of Côte d'Ivoire. At "Entent" area of Treichville, Breteau index was estimated at 34, recipient index at 20% and house index at 25%. Those indexes were respectively 53, 21 and 31% at "Vridi canal" of Port Bouet. In the both neighborhood, Aedes aegypti accounted for more than 80% of mosquitoes caught and more than 90% of mosquitoes adults obtained from larval breeding. This new situation of epidemic risk could be explained by several factors including the reception of 70% of forced migration people caused by the crisis in the country occurred in 2002, the probable drop of preventive immunization, the environment deterioration creating of more breeding sites of Ae. aegypti.
Assuntos
Aedes/crescimento & desenvolvimento , Insetos Vetores/crescimento & desenvolvimento , Febre Amarela/transmissão , Aedes/virologia , Animais , Anopheles/crescimento & desenvolvimento , Anopheles/virologia , Côte d'Ivoire/epidemiologia , Culex/crescimento & desenvolvimento , Culex/virologia , Meio Ambiente , Feminino , Habitação , Humanos , Insetos Vetores/virologia , Masculino , Fatores de Risco , Febre Amarela/epidemiologiaRESUMO
A longitudinal entomological study was carried out from January to June 2007 in the rice-growing area of Tiassaékro, a village located in the forest, South of Côte d'Ivoire. The study was based on samples of mosquitoes caught on human volunteers indoors and outdoors. During the 6 months of the study 29481 female mosquitoes were caught. The average biting rate was 272.9 bites per man per night (b/m/n). An. gambiae was the most predominant with 79.1% of mosquitoes caught. The average biting rate of An. gambiae was of 216 b/m/n. The biting activity of this species was noticed between 8 p.m. and 6 a.m. The estimated average sporozoite index was 0.32% (n = 3423 dissected). The inoculation rate was 0.69 ib/m/n with the highest rate (1.99 ib//n) recorded in April. The entomological parameters of the transmission are influenced by the different stages of rice growing.
Assuntos
Mordeduras e Picadas/parasitologia , Culicidae/parasitologia , Malária/transmissão , Animais , Mordeduras e Picadas/complicações , Mordeduras e Picadas/epidemiologia , Clima , Côte d'Ivoire , Feminino , Humanos , Oryza/parasitologia , Glândulas Salivares/parasitologia , ÁrvoresRESUMO
This transverse descriptive study was conducted over a three-month period from January 10 to April 10, 2003. Findings demonstrated a clear profile of 120 patrons of traditional drinking establishments called n the city of Abidjan and surrounding areas in the Ivory Coast. All subjects interrogated were male. Mean age was 31.1 years. Almost all subjects interrogated (99.2%) were of Ivory Coast nationality. The main ethnic group was Akan (86.7%) from Baoulé (60%). More than a third (35.9%) of subjects interviewed were unemployed. Most (62.5%) were single. All subjects interrogated stated that they attended "bandjidromes" to drink palm wine although other alcoholic beverages were served. However only 9.2% of subjects drank only palm wine. The euphoric effect of alcohol and friendly atmosphere of the drinking establishment were the main reasons for attendance (53.3%). Most persons interrogated (63.3%) had been consuming alcohol for more than 10 years. More than half (55%) spent less than three hours a day drinking alcoholic beverages. Daily consumption of palm wine ranged from two to four liters for most atrons (76.7%). Only 2.5% (3/120) presented neuropsychiatric disturbances. These results could be useful in the fight against alcoholism.
Assuntos
Comportamento de Ingestão de Líquido , Adolescente , Adulto , Bebidas Alcoólicas , Côte d'Ivoire , Estudos Transversais , Humanos , Relações Interpessoais , Masculino , Estado Civil/estatística & dados numéricos , Pessoa de Meia-Idade , Meio Social , Desemprego/estatística & dados numéricosRESUMO
In photodynamic therapy (PDT), excitation of a drug by light leads to a cascade of biochemical processes that can cause closure of blood vessels. It has been observed clinically that significant short-term leakage from the irradiated vasculature can occur prior to vessel closure and blood flow stasis. In this paper we demonstrate in a chicken embryo model that this leakage can be significantly enhanced by the presence of the cyclo-oxygenase inhibitor, aspirin. We also observe that following this aspirin-enhanced leakage, blood vessels close as effectively as after PDT in the absence of aspirin. Consequently we propose that this PDT-induced aspirin-enhanced leakage can be used to locally deliver a drug for combination therapy. This is then demonstrated in the chicken embryo using Visudyne as a PDT agent in combination with aspirin and fluorescein isothiocyanate dextran 10 kDa as leakage indicator. The latter represents a hypothetical drug to be delivered in various kinds of combination therapy. Two examples of this procedure would be the photodynamic treatment of choroidal neovasculature associated with exudative age-related macular degeneracy (AMD) where local delivery of an anti-angiogenic or an anti-inflammatory drug has been shown to be effective, or PDT of cancer where local dosing of a chemotherapeutic drug may well increase the treatment efficacy.
Assuntos
Aspirina/farmacologia , Vasos Sanguíneos/efeitos dos fármacos , Sistemas de Liberação de Medicamentos , Fotoquimioterapia/métodos , Animais , Embrião de Galinha , Terapia Combinada , Inibidores de Ciclo-Oxigenase/farmacologia , Angiofluoresceinografia , Heparina/farmacologia , Degeneração Macular/tratamento farmacológico , Degeneração Macular/terapia , Neoplasias/tratamento farmacológico , Neoplasias/terapia , Fármacos Fotossensibilizantes/farmacologia , Porfirinas/farmacologia , VerteporfinaRESUMO
The systematic screening in high risk groups can be an efficient way to struggle against HIV/AIDS. We have conducted a transversal descriptive study in patients suffering from STI and who had consulted the antiveneral dispensary of the Institut National de Santé Publique (Abidjan) from 1st September 2002 to 31st October 2002. The aim was to identify the acceptability of the HIV screening test. During this inquiry, 167 patients were recruited. This study permits to confirm the young age of the population with a male predominance in patients having sexual transmitted infections. So, 70.1% have accepted to do this test. However, 23.4% of patients recruited had really done the HIV test. Among those who have accepted to do the test, 28.2% were infected.
Assuntos
Sorodiagnóstico da AIDS/estatística & dados numéricos , Aceitação pelo Paciente de Cuidados de Saúde/estatística & dados numéricos , Infecções Sexualmente Transmissíveis , Adolescente , Adulto , Côte d'Ivoire , Estudos Transversais , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Infecções Sexualmente Transmissíveis/epidemiologiaRESUMO
In the present study, photodynamic activity of a novel photosensitizer (PS), Chlorin e(6)-2.5 N-methyl-d-glucamine (BLC 1010), was evaluated using the chorioallantoic membrane (CAM) as an in vivo model. After intravenous (i.v.) injection of BLC 1010 into the CAM vasculature, the applicability of this drug for photodynamic therapy (PDT) was assessed in terms of fluorescence pharmacokinetics, i.e. leakage from the CAM vessels, and photothrombic activity. The influence of different PDT parameters including drug and light doses on the photodynamic activity of BLC 1010 has been investigated. It was found that, irrespective of drug dose, an identical continuous decrease in fluorescence contrast between the drug inside and outside the blood vessels was observed. The optimal treatment conditions leading to desired vascular damage were obtained by varying drug and light doses. Indeed, observable damage was achieved when irradiation was performed at light doses up to 5 J/cm(2) 1 min after i.v. injection of drug doses up to 0.5 mg/kg body weight(b.w.). However, when irradiation with light doses of more than 10 J/cm(2) was performed 1 min after injection of drug doses up to 2 mg/kg body weight, this led to occlusion of large blood vessels. It has been demonstrated that it is possible to obtain the desired vascular occlusion and stasis with BLC 1010 for different combinations of drug and/or light doses.
Assuntos
Capilares/efeitos dos fármacos , Membrana Corioalantoide/efeitos dos fármacos , Fármacos Fotossensibilizantes/farmacologia , Porfirinas/química , Porfirinas/farmacologia , Animais , Capilares/patologia , Capilares/efeitos da radiação , Embrião de Galinha , Clorofilídeos , Membrana Corioalantoide/irrigação sanguínea , Membrana Corioalantoide/efeitos da radiação , Relação Dose-Resposta a Droga , Relação Dose-Resposta à Radiação , Avaliação Pré-Clínica de Medicamentos , Luz , Estrutura Molecular , Fármacos Fotossensibilizantes/química , Fármacos Fotossensibilizantes/farmacocinética , Porfirinas/farmacocinética , Solubilidade , Água/químicaRESUMO
OBJECTIVES: To assess the quality of sexually transmitted infections (STI) care in health care facilities in Abidjan attended by female sex workers. METHODS: A cross-sectional study was conducted in June 2000 in the 29 health care facilities and 10 pharmacies, which were reported as points of first encounter for STI care by female sex workers in a previous study on health seeking behaviour. Evaluation components included: (1) checklists of equipment and STI drugs in the facilities; (2) interviews with health care providers and pharmacists; (3) direct observation of the provider/client interaction; (4) exit interviews with women attending with STI or genital problems. RESULTS: Private health care facilities were more expensive, had fewer clients, and had less equipment and medical staff than public facilities, with the exception of the special female sex worker clinic. A total of 60 health care providers and 29 pharmacists were interviewed. There was no difference in their scoring on syndromic approach case studies, with the exception of the nurse assistants, who scored less. Overall scores for correct treatment were lowest for the pharmacists. We observed 513 provider-client interactions, of which 161 related to STIs or genital problems in women. Questions about recent sexual contacts were asked in only 20% and preventive messages were given in only 9% of the cases with STI/genital problems. Of 161 clients interviewed, 44% complained about a long waiting time, and 39% thought the health care provider had adequately explained the problem to them. CONCLUSIONS: The opportunity for improvement of STI case management in health care facilities in Abidjan where female sex workers go for STI care is enormous. Public and private health care facilities should be made more accessible for sex workers, and their services should be upgraded to better respond to the sexual health needs of high risk women.
Assuntos
Qualidade da Assistência à Saúde , Trabalho Sexual , Infecções Sexualmente Transmissíveis/prevenção & controle , Venereologia/normas , Assistência Ambulatorial/normas , Competência Clínica/normas , Côte d'Ivoire , Estudos Transversais , Feminino , Conhecimentos, Atitudes e Prática em Saúde , Pessoal de Saúde/normas , HumanosRESUMO
Three surveys related to the knowledge, attitude and practices of populations towards mosquitoes were conducted in Côte d'Ivoire. The first survey was undertaken in June 1994 in the city of Bouaké and the other two respectively in January 1996 and in June 1999 in the village of Kafiné. The surveys have revealed that whatever the environment, nuisance due to mosquitoes constitutes a great concern for the population of the villages. The majority of people interviewed in urban (94%), peri-urban (68%) zones and in Kafiné (94%) associates mosquito with malaria against 18% only in Kabolo. Furthermore, these surveys have allowed the inventory of methods of controlling mosquito currently used by the communities in both urban and rural areas. Generally mosquito coils as well as insect sprays are currently used because of their cheapness and their availability on the local market. in Bouaké, insect sprays (97% to 99%) are used as much as mosquito coils (87% to 98%). However, in Kafiné and Kabolo, insect sprays are only used by respectively 76% and 69% and the mosquito coils by respectively 68% and 71%. In urban zones, the insect sprays are more common than mosquito coils. On the contrary mosquito coils are currently used in villages due to their low price (40 to 50 FCFA) and their constant availability on the local market. Furthermore, local plants characterized by a repulsive essence are known by 48% and 75% of people interviewed respectively in the urban and peri-urban area of the city of Bouak6, by 74 % of the population of Kafiné and 73% of people living in Kabolo. In the last village 57% of people who were interviewed do not use any means of orotection due to financial reason; only 14% use mosquito coils and 20% use local plants with a repulsive essence. Mosquito net is known by the majority of people interviewed (82 - 98%) as an excellent means of orotection against mosquito bites. However only 27%, 13%, 26% and 5% of people respectively living in the urban and peri-urban areas of Bouaké and in the villages of Kafiné and Kabolo own their mosquito net. Its cost is the main reason for not using it as mentionned by 25% of people interviewed in the urban neighborhood, by 48% in the peri-urban areas, respectively 46% and 89% in the villages of Kafiné and Kabolo. Although its effectiveness has been proved by the communities, mosquito net still remains less common. Its price is relatively high (3500 - 5000 FCFA). It is not constantly available on the local market. Other socio-cultural factors such as local beliefs and taboos hinder the use of mosquito nets by the communities.
Assuntos
Culicidae , Conhecimentos, Atitudes e Prática em Saúde , Insetos Vetores , Controle de Mosquitos , Adulto , Aedes/crescimento & desenvolvimento , Aedes/virologia , Animais , Côte d'Ivoire/epidemiologia , Culex/crescimento & desenvolvimento , Culex/virologia , Culicidae/parasitologia , Culicidae/virologia , Reservatórios de Doenças , Escolaridade , Feminino , Inquéritos Epidemiológicos , Humanos , Mordeduras e Picadas de Insetos/epidemiologia , Mordeduras e Picadas de Insetos/prevenção & controle , Insetos Vetores/parasitologia , Insetos Vetores/virologia , Inseticidas , Larva , Malária/transmissão , Masculino , Controle de Mosquitos/instrumentação , Controle de Mosquitos/métodos , Controle de Mosquitos/estatística & dados numéricos , Plasmodium , População Rural , População Urbana , Febre Amarela/transmissão , Vírus da Febre AmarelaRESUMO
Repellents in the form of dermal pomades are recommended as a protection against awakening and bedtime mosquito bites. If synthesis repellents are available, they are nevertheless not common and the prices remain out of reach for the communities concerned. The people therefore have to resort more and more to traditional concoctions, some of which have been shown to be effective. After demonstrating that oil-based formulations (lotions, creams, pomades) of Cocos nucifera (coconut), Elaeis guineensis (oil palm) and Carapa procera (gobi) were effective against mosquitoes, it became necessary to study the impact of the two excipients used in their manufacture, on the effectiveness of the repellents. Experiments were carried with Anopheles gambiae and Aedes aegypti under lobaratory conditions and any other mosquitoes collected under field conditions in Ivory Coast. The laboratory results indicate that the average protection times obtained with formulations with karite nut butter as excipient (54.8 +/- 37.0 mn and 74.6 +/- 26.4 mn respectively on An. gambiae and Ae. aegypti) are higher than those recorded with vaseline as excipient (respectively 42.7 +/- 30.0 mn and 60.8 +/- 33.9 mn). On the other hand, under field conditions, the biting rate percentage reduction obtained with the products with karite nut butter and vaseline excipient were similar (respectively 29.8% and 35.9% for all mosquitoes collected and 45.7% and 47.4% against An. gambiae). Nevertheless, the use of karite nut butter on repellent products should be encouraged because its sale price is very lower (10 time less) than the vaseline's.
Assuntos
Culicidae , Excipientes/farmacologia , Mordeduras e Picadas de Insetos/prevenção & controle , Repelentes de Insetos/normas , Controle de Mosquitos/métodos , Óleos de Plantas/química , Administração Cutânea , Animais , Óleo de Coco , Côte d'Ivoire , Excipientes/química , Feminino , Humanos , Repelentes de Insetos/farmacologia , Óleo de Palmeira , Vaselina/química , Vaselina/farmacologia , Fatores de Tempo , Resultado do TratamentoRESUMO
The cellular uptake, localization and efflux of meso-tetra-(4-hydroxyphenyl)porphyrin (p-THPP)-loaded nanoparticles have been studied in EMT-6 tumor cells. The effect of blood serum on photocytotoxicity has also been evaluated. Sub-130 nm nanoparticles based on poly(D,L-lactide-co-glycolide) (PLGA) (50:50 PLGA and 75:25 PLGA) and poly(D,L-lactide) (PLA) have been examined in comparison with free p-THPP. For all formulations tested, uptake of photosensitizer into cells was dependent on concentration, time and temperature. All nanoparticulate formulations accumulated within the cells to a greater extent relative to free drug. Indeed, the fluorescence intensities measured on EMT-6 cells treated with p-THPP-loaded nanoparticulate formulations were at least two-fold higher than those obtained with free dye. Furthermore, the highest accumulation level was found with PLGA nanoparticles. Fluorescence microscopy revealed that endocytosis is a major intracellular sequestration mechanism of these p-THPP formulations and that these were localized into early and late endosomes. The efflux study performed on both nonirradiated and irradiated cells indicated that free and p-THPP-loaded nanoparticles gradually escaped from EMT-6 cells as a function of time. This was more pronounced when cells were treated with nanoparticles and irradiated, reflecting important photodamage. It was also found that regardless of the nanoparticulate formulations tested, p-THPP photocytotoxicity was influenced by the concentration of the serum.
Assuntos
Nanotecnologia , Porfirinas/metabolismo , Soro/metabolismo , Animais , Transporte Biológico , Relação Dose-Resposta a Droga , Fluorescência , Ácido Láctico/química , Neoplasias Mamárias Animais/tratamento farmacológico , Neoplasias Mamárias Animais/metabolismo , Camundongos , Fotoquímica , Poliésteres/química , Ácido Poliglicólico/química , Copolímero de Ácido Poliláctico e Ácido Poliglicólico , Polímeros/química , Porfirinas/uso terapêutico , Porfirinas/toxicidade , Temperatura , Células Tumorais CultivadasRESUMO
The efficacy of pieces of nets treated with two formulations of deltamethrin (concentrated suspension at 1% and tablets at 25%) against two strains of Culex quinquefasciatus ("S-Lab", sensitive strain and "Bouaké", local strain) has been evaluated at the laboratory by experimental tunnels tests. The observed mortality of the sensitive strain has been 2-3 time more important than that of local strain. This observation seems to be linked to Culex quinquefasciatus of Bouaké pyrethrinoids-resistance. The excito-repellency effect of the two formulations has been lower for the local strain than for the sensitive strain. It has also been more important with the tablet at 25% than with concentrated suspension at 1%. The blood feeding rate has been more important for the local strain than for sensitive strain and it has been lower with the tablet at 25% than with the concentrated suspension at 1%.
Assuntos
Culex , Resistência a Inseticidas , Piretrinas/administração & dosagem , Animais , Côte d'Ivoire , Inseticidas/administração & dosagem , Controle de Mosquitos , NitrilasRESUMO
A comparative study of the in vivo sensitivity of Plasmodium falciparum to amodiaquine versus chloroquine has been made among children in Agou (south Côte d'Ivoire). In case of resistance to these drugs, the association of sulfadoxine-pyrimethamine was administered and followed by a J14 checking. We have noticed: (1) 8.47% of amodiaquine resistance versus 36.96% of chloroquine resistance (all these resistances are from type II), (2) a good clinical efficiency of the 4 amino quinolines. Only 1.69% of the subjects having resistant stocks to amodiaquine have gone feverish down to J7 whereas 10.47% of subjects have clinically resisted to chloroquine, (3) a good tolerance of drugs and an excellent clinical and parasitological efficiency of the second intention treatment. These data are in favour of using first the 4 amino quinolines (particularly the amodiaquine) in the treatment of simple bout of malaria to Plasmodium falciparum in this region. In case of resistance to these drugs, we recommend the combination sulfadoxine-pyrimethamine.