[The contribution of biology laboratories to keep immunization recommendations up to date: the example of the Centre Pasteur of Cameroon in the fight against meningococcal meningitis in North-Cameroon]. / Place du laboratoire de biologie médicale dans les recommandations vaccinales: l'exemple du Centre Pasteur du Cameroun dans la lutte contre les méningites a méningocoque au Nord-Cameroun.

The Centre Pasteur of Cameroon, Annex of Garoua, studied since 2007 méningococcus of meningitidis in the North of Cameroon. The serogroup A méningococcus completely seem to have disappeared with the profit from the serogroup W135 méningococcus. Current measurements of answers to an epidemic, based between others on reactive vaccination will have to take into account these new data to remain effective. Trivalent vaccine ACW135, placed at the disposal by WHO, should logically be able to be used in the event of epidemic, under reserve of an identification of the germ by a laboratory. The diffusion of the results of the circulation of serogroup W135 méningococcus supported vaccination by the tetravalent vaccine, but this one remains very expensive and, so held for a negligible minority of the population of North-Cameroon. It is part from now on of the recommendations to the travellers.

Aide à la décision thérapeutique et pharmaco-économique dans les stratégies antirétrovirales des pays à ressources limitées : approche méthodologique par modélisation

Afin d'améliorer l'accès aux antirétroviraux dans les pays à ressources limitées, l'OMS recommande des schémas thérapeutiques simplifiés pour permettre une mise en œuvre efficace des programmes de traitement dans ces pays tout en limitant les dépenses. Cependant le choix de l'un de ces schémas thérapeutiques devrait intervenir au niveau national. L'étude est une modélisation de l'aide à la décision thérapeutique et pharmaco-économique basée sur le logiciel-modèle Puzzle du Laboratoire d'Analyse des Systèmes de Santé de Lyon (France). Notre objectif principal est d'établir une classification préférentielle de ces trithérapies en fonction du paramètre coût-efficacité dans la prise en charge du VIH/SIDA dans ces pays. Les différentes options de trithérapies ont été groupées en plusieurs stratégies thérapeutiques selon les critères suivants: âge du patient, type de VIH, co-infection VIH/tuberculose, grossesse ou risque de grossesse, type de toxicité et substitution, échec thérapeutique. Nous avons retenu sept principaux critères de comparaison entre les différentes trithérapies. Ces critères sont inspirés des recommandations de l'OMS pour un choix efficient. Il s'agit de : l'efficacité, la toxicité, la surveillance biologique de la tolérance, la facilité ou la complexité de la prise quotidienne, l'effet repas, la chaîne de froid, le coût du traitement journalier de la trithérapie. Ces critères ont un lien direct ou indirect avec les résultats thérapeutiques et le coût global de la prise en charge médicamenteuse du VIH/SIDA. Les résultats fournis par le logiciel se présentent sous forme d'échelle coût-efficacité évoluant de la trithérapie la moins coût/efficace à la trithérapie la plus coût-efficace dans une stratégie thérapeutique donnée

Efficacy of permethrin-treated uniforms in combination with DEET topical repellent for protection of French military troops in Côte d'Ivoire.

In 2000, 22,000 French military personnel were deployed overseas. The French military health service implemented a vector control strategy including personal protection by the use of permethrin preimpregnated battlefield uniforms (BFUs) and the application on the skin of a topical repellent (50% DEET). In 2000, French forces used an industrial process to impregnate cloth with permethrin by soaking it before cut-out of the BFU. A study was implemented in four experimental huts in Côte d'Ivoire to assess the field efficacy of the impregnated BFUs and their resistance to washing. Taking into account the systematic variations in each variable in the field and using a modeling based on logistic regression and discriminant analysis, this study showed that after 6 h without reapplication, the protective effects of the use of DEET as skin repellent was not significant, perhaps due to the high density of Anopheles mosquitoes during the night catching sessions and an average time of effective repellency of < 2 or 3 h in the field. The analysis also showed that the French process of industrial impregnation of permethrin of the BFU offered in 2000 some protection from mosquito bites but not enough to reduce significantly the incidence of malaria among nonimmune troops. No positive or negative interaction was noted when DEET and the impregnated BFUs were used together.

[European Center for Humanitarian Health (CESH). Providing operational know-how directly applicable in crisis situations]. / Le Centre européen de sante humanitaire CESH. Transmettre un savoir faire opérationnel applicable directement dans des situations de crise.

Founded in 1997 at the initiative of Charles Mérieux, the European Center for Humanitarian Health Care (French acronym, CESH) is a Public Interest Organization comprising 7 members, i.e., Lyon 1 Claude Bernard University, Aix-Marseille II University of the Mediterranean, the Public Hospital System of Lyon, the Public Hospital System of Marseille, the French Army Health Corps, the Mérieux Foundation, and the National School of Veterinary Medicine in Lyon. The CESH is a multifunctional resource dedicated to providing education, information, and research in the field of humanitarian action. The objectives of the CESH's Educational Program are to increase awareness of the complexity of humanitarian action and teach the principles and methods necessary to integrate experienced teams already in the field. Courses including a three-week study program sanctioned by an Interuniversity Degree in Public Health and several 2-to-3-day training modules are open to all humanitarian actors including field workers and decision-makers, health-care professionals, and governmental or other administrative agents. Thanks to a diverse faculty with academic, humanitarian, training, civilian and military backgrounds and to a wide-ranging curriculum, the CESH helps to promote communication and to open up closed pathways of cooperation between the different groups involved in humanitarian action. The module entitled "Humanitarian Assistance and Civilian and Military Cooperation" exemplifies the effort of the CESH to generate collaborative behavior among civilian and military actors. The CESH's Research Program is aimed at providing practical tools for decision-making in the field. The web site of the CESH [http://cesh.univ-lyon1.fr] presents the mission and activities of the Center as well as information on course enrolment and humanitarian action.

[Conclusion: challenges and stakes in humanitarian action in the XXIth century]. / Conclusion: enjeux et defis de l'humanitaire au XXIe siècle.

The authors in the special issue devoted to humanitarian action use their own experience, analysis, and thought as a basis for identifying the challenges and stakes facing humanitarian action in the twenty-first century. They present their thoughts on the relevance of humanitarian intervention, on the need to combine emergency aid with development assistance, and on the development of governmental humanitarian action. In today's world there is a compelling obligation for communities with resources and means to undertake humanitarian action in the name of human dignity. Adopting a code of conduct, respecting minimal standards, and evaluating the outcome are now universally accepted principles, but the modalities of applying these principles are still subject to discussion especially with regard to standards and accreditation. The importance of adequate training and preparation for humanitarian action has also been established. Currently most humanitarian operations involve numerous actors from different organizations that may be national or international as well as governmental, intergovernmental, or non-governmental. A major portion of this issue is devoted to the relationship between military forces and humanitarian organizations. The need to coordinate action in the field is emphasized. Humanitarian actions are increasingly complex operations carried out in fast-changing situations by numerous players. As a result it has become more and more important that actors in the field know each other in order to work together efficiently and thus better reach their common goal of relieving and preventing human suffering in accordance with ethical principles.

[Antimalarial chemoprophylaxis in the French army: development from 1986 to 2001]. / La chimioprophylaxie antipaludique dans les armées françaises: évolution de 1986 à 2001.

In 1999, almost 25,000 French soldiers were deployed in malaria transmission areas. With an incidence of 4.5 p. 100 men.year, malaria infection remains a serious problem requiring priority status for control in military personnel. Epidemiological surveillance provides data necessary to assess morbidity due to malaria, monitor changing patterns of Plasmodium falciparum drug-sensitivity, and evaluate the efficacy of malaria control measures. In 1990, the French army replaced chemoprophylaxis using chloroquine alone with combination treatment using a single capsule containing 100 mg of chloroquine base and 200 mg of proguanil chlorhydrate. This measure in association with the use deltamethrine impregnated bed-nets led to a significant decrease in incidence. However a comeback was observed from 1993 to 1997. Since 1995, the effectiveness of the chloroquine-proguanil combination has diminished mainly in the stable malaria areas. In response to increasing Plasmodium falciparum resistance to chloroquine-proguanil chemoprophylaxis, it was necessary to find an alternative. Two studies carried out among French soldiers in Sub-Saharian Africa between 1996 and 1998 demonstrated that a daily dose 100 mg doxycycline was more effective than the chloroquine-proguanil combination. In addition the 1998 study showed that doxycycline monohydrate in the form of a multiparticle tablet was better tolerated. In 2001 four drugs are used for malaria chemoprophylaxis in the army personnel, i.e., chloroquine and proguanil in combination, mefloquine, and doxycycline, depending on location and duration of mission. The chloroquine-proguanil combination is used in countries with chloroquine-resistant strains, e.g., Chad and Senegal. Mefloquine and doxycycline are used in countries with chloroquine-resistant strains. Due to increasing resistance, it will be necessary to evaluate other drugs or antipaludian combinations.

Malaria prophylaxis in the French armed forces: evolution of concepts.

Malaria is still a serious public health problem in the world and control remains a major priority for the approximately 25.000 French troops deployed, mostly on permanent assignment, in malaria transmission regions. Epidemiological surveillance of malaria provides data necessary to assess morbidity, monitor changing patterns of Plasmodium falciparum drug-sensitivity, and evaluate the efficacy of malaria control measures. About 540 cases were observed in 1999 for an incidence of 4.1 p. 100 men. year. Since 1991, strong emphasis has been placed on prophylaxis. In addition to vector control measures and individual protection against mosquito bites (impregnated bednets, protective clothing, application of repellents, and indoor insecticide spraying), drug prophylaxis has been recommended using a combination of 100 mg of chloroquine and 200 mg of proguanil chlorhydrate (CQ + PG) in a single capsule manufactured by the French Health Army Service. Initially this policy led to a significant decrease in malaria cases among French soldiers. However the incidence of malaria rose in 1995 and 1996. This recrudescence was attributed to poor compliance with chemoprophylaxis and to the declining efficacy of the CQ + PG combination. In response to these problems, a new policy was implemented especially in countries where cycloguanil-resistant Plasmodium falciparum incidence rate is increasing. The new chemoprophylactic regimen calls for a personal prescription of mefloquine. Doxycycline monohydrate is used in case of mefloquine contra-indication or intolerance. Combination of CQ + PG delivered in a single capsule remains a suitable chemoprophylactic regimen in Sahel countries as well as Horn of Africa.

[Disease vector control strategy in the French army]. / La stratégie de lutte antivectorielle dans les armées françaises.

Disease vector control is a major priority for the Medical Health Corps of the French Armed Forces which maintains around 23,000 troops in tropical areas and is involved in numerous military and humanitarian missions throughout the world. Control strategy includes both general and personal control measures. Personal control measures include wearing permetherin-impregnated combat uniforms, application of repellents to the skin, and use of deltamethrin-impregnated bednets. General measures are implemented in facilities and in the environment. Measures in facilities include not only physical deterrents such as screens on openings and air-conditioning but also application of chemical insecticides to walls, curtains, and screening. Environmental measures include control of larval deposits and elimination of potential breeding areas. Low-volume wide-area spraying of imagocides is a supplemental option used in case of disease outbreak. For units stationed in tropical areas, command and surveillance of vector control operations is under the responsibility of the mosquito control committee which includes personnel from the affected field unit. Strategies are chosen in function of local climate and operational conditions. The efficacy of vector control programs is assessed annually by reviewing the incidence in armed forces personnel of the main vector-transmitted diseases: malaria, dengue fever, and leishmaniasis. Documentation and training are dispensed to all units stationed in tropical areas. To ensure that knowledge of military physicians remains current, three courses on malaria control are offered each year at the Tropical Medicine Institute of the Armed Forces Health Corps (Le Pharo) in Marseille. Field research conducted in collaboration with military or civilian organizations independent of the Armed Services Health Corps makes it possible to keep chiefs of staff informed of state-of-the art vector control measures adapted to use by personnel on assignment or mission in tropical areas.

[Epidemiologic surveillance of dengue fever in the French army from 1996 to 1999]. / Surveillance epidemiologique de la dengue dans les armées françaises de 1996 à 1999.

Dengue fever is a widespread disease that can occur outside tropical areas. Several thousand French military personnel are exposed to this infectious risk each year and exposure is expected to rise with the creation of a professional army and the increasing number of foreign missions. As a result, dengue fever has become a major priority for the Armed Services Health Corps (ASHC). A system of epidemiological surveillance based on the active participation of all military physicians has been designed by the ASHC to collect and analyze all data relevant to cases of dengue fever involving French military personnel stationed overseas or at home. The purpose of this study is to present data compiled for the period from 1996 to 1999. Analysis of these data demonstrated that the incidence of dengue fever peaked in 1997 due to epidemic outbreaks occurring in French Polynesia and Martinique. In response to these outbreaks control measures were adapted especially in regard to vector control. This study shows that the system of surveillance implemented by the ASHC is an effective but still perfectible tool.

Jail fever (epidemic typhus) outbreak in Burundi.

We recently investigated a suspected outbreak of epidemic typhus in a jail in Burundi. We tested sera of nine patients by microimmunofluorescence for antibodies to Rickettsia prowazekii and Rickettsia typhi. We also amplified and sequenced from lice gene portions specific for two R. prowazekii proteins: the gene encoding for citrate synthase and the gene encoding for the rickettsial outer membrane protein. All patients exhibited antibodies specific for R. prowazekii. Specific gene sequences were amplified in two lice from one patient. The patients had typical clinical manifestations, and two died. Molecular techniques provided a convenient and reliable means of examining lice and confirming this outbreak. The jail-associated outbreak predates an extensive ongoing outbreak of louse-borne typhus in central eastern Africa after civil war and in refugee camps in Rwanda, Burundi (1), and Zaire.

[Evaluation of the completeness of the epidemiological surveillance systems for malaria by the Capture-recapture system in the French armies in l994]. / Evaluation de l'exhaustivité des systèmes de surveillance épidémiologique du paludisme dans les armées françaises en 1994 par la méthode de Capture-recapture.

The Capture-recapture method has been utilized to evaluate the annual incidence of malaria in the French armies in 1994 on the basis of the incidence derived from two regulatory systems, passive and exhaustive, of epidemiological surveillance: the Recueil et l'Exploitation des Données Epidémiologiques des Armées (REDEA) and the Surveillance Epidémiologique du Paladisme (SESP) system. Cases of malaria found by REDEA and SESP in 1994 rose to 480 and 424 respectively. Two hundred and thirty-eight cases were found by both systems. After validating the conditions for the application of the Capture-recapture method (in particular, having verified that the results from REDEA and SESP were probably independent), its utilization allowed us to evaluate the incidence of malaria in the French army in 1994 at 854 cases. The calculated exhaustivity values for REDEA and SESP were 56.2 and 49.6% respectively; 22% of cases were missed by both systems. The exhaustivity values of SESP and REDEA estimated in our study were comparable to those obtained by the Capture-recapture method applied in another legal inquiry into the passive and exhaustive epidemiological surveillance of meningitis and meningococcosis in France in 1989 and 1990. These results show that it is difficult to evaluate the epidemiological importance of a sickness on the results of passive and exhaustive surveillance alone. In 1995, a new system of surveillance was established in the army: a better conducted and more motivated retro-informative system, linked to a better education of medical officers in epidemiological surveillance permitted an improvement in the completeness of the results in the armies.

[Malaria epidemic during a military-humanitarian mission in Africa]. / Epidémie de paludisme au cours d'une intervention militaro-humanitaire en Afrique.

A malaria epidemic broke out among French servicemen during a humanitarian military mission carried out in Central Africa in 1996. The purpose of this study was to determine compliance with drug prophylaxis for malaria by measuring blood levels of antimalarial drugs (combination treatment using chloroquine-proguanil or treatment with doxycycline) as well as to assess the conditions of vector control. The incidence density rate of malaria over a 60-day period was 3.1 cases per month per 100 men. Only reinforcement troops were affected. The risk of developing malaria was 5 times higher among new arrivals than in servicemen who had been in the zone for several months (95% CI relative risk = [2.9-7.8]). Type of prophylactic treatment had no effect on the incidence density rate. Study data showed that 40.2% of those treated for malaria were not in compliance with prophylactic treatment at the time of the malarial attack and that those who were in compliance with prophylaxis, i.e. the remaining 59.8%, presented a strain of plasmodium that was resistant to the prophylactic drugs at doses used. Findings also indicated the epidemic occurred mainly because operating conditions prevented implementation of proper vectorial control. The risk of epidemic could probably have been reduced by improving compliance with prophylactic treatment and changing standard vectorial control techniques, e.g. by using insecticide-treated uniforms.

[Current status of dengue virus infections. Epidemiologic and pathogenetic aspects]. / Actualités des infections à virus dengue. Aspects épidémiologiques et pathogéniques.

The epidemiology of dengue fever is changing dramatically. The worldwide incidence is rising and clinical symptoms are worsening. Reports describing forms associated with hemorrhage or shock syndrome involving both children and adults are increasingly frequent in regions beyond Southeast Asia where the first cases were observed. Many mechanisms could be implicated in these changes including modifications of the virus, host, vector, or socioeconomic factors. Since no current model allows laboratory analysis of these mechanisms, observation of epidemics is still a major source of data. The findings of well conducted epidemiological studies allow not only assessment of morbidity and mortality in endemic areas and early detection of epidemic outbreaks but also evaluation of socioeconomic impact and effectiveness of control measures. Surveillance techniques must be chosen in function of prevailing local conditions. To ensure reliable results studies should be carried out in collaboration with an international network and a simple and accurate method of disease identification should be used.