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[Study of HIV seroprevalence in patients with pulmonary tuberculosis in 1999 in Chad].

Tuberculosis is the most common opportunistic disease occurring in the course of human immunodeficiency virus (HIV) infection. With the development of HIV infection in Chad, tuberculosis has quickly become a major public health concern. The purpose of this cross-sectional study in two tuberculosis centres (Moundou and Ndjamena) was to evaluate HIV seroprevalence, epidemiological characteristics and risk factors in patients with tuberculosis. All patients with positive sputum-smears who had never been treated for tuberculosis previously were eligible. A total of 466 patients (sex ratio M/F: 1.96) were included during the six-month period between January and June 99. Each subject was asked to fill out an anonymous standardized questionnaire with detailed information on demographic characteristics, sexual behavior and other risk factors for HIV infection. Data were compared using the Chi-square test, Student's T test and multivariate analysis (logistic regression). One third (33.2%) of patients was seropositive for HIV-1. Mean age was 31.1 years in HIV-positive group and 33.6 years in the HIV-negative group (p = 0.02). The age groups with the highest risk for HIV were 20-29 years and 30-39 years (p < 0.01). Women were more often seropositive that men (39.5% versus 30.1%; p = 0.04). Seropositive patients were more likely to have multiple sexual partners (mean: 1.76; p < 0.01) and a history of sexually transmitted disease (19.9% versus 8.1%; p = 0.01). The mean age at the time of first sexual relations was 16.3 years in the HIV group and 17.1 years in the control (p < 0.01). The percentage of seropositive patients was 39.6% at Moundou and 29.8% at N'djamena (p > 0.01). Multivariate analysis showed that early age of first sex relation (OR = 0.85; 95% IC: 0.74-0.97), higher number of sexual partners (OR = 1.8; 95% CI: 1.4-2.4) and level of education were strongly correlated with HIV infection. The prevalence of HIV in tuberculosis patients is a good indicator of HIV-infection in developing countries. Prevalence of HIV infection is high in tuberculosis patients in Chad. Surveillance for tuberculosis and AIDS must be strengthened in Chad. Mores cooperation is needed between tuberculosis and AIDS control programs. Emphasis should be placed on screening for tuberculosis, early tuberculosis treatment and diagnosis of HIV in tuberculosis patients.

Adolescent↗

[History of the public health policy in Chad 1900-1995].

Public health policy in Chad began after colonization in 1899 and remained under the control of French Army Medical Corps for a long time. Military doctors shared their time between treating service personnel and indigenous people entitled Medical Assistance and making rounds in their sector. Since independence public health in the country has been based on a two-pronged association including fixed facilities (hospitals and dispensaries) and mobile services such as the Endemic Disease Unit whose most notable success was control of sleeping sickness in the southern part of the country. Over the years Chad has built up a national medical staff comprising 150 physicians. A medical school was opened in N'Djamena in 1990 and paramedical personnel are now trained at the National School for Public Health. War and lack of funds interrupted mobile services and there is presently a recrudescence of sleeping sickness. Since 1990 the World Health Organization has imposed its views and primary care is now available for all. However, it is now too early to judge the efficacity of this program in Chad.

Chad↗

Fishing and farming at Lake Chad: institutions for access to natural resources.

Lake Chad is a vitally important wetland in the semi-arid Sahel corridor. It provides the basis of many thousands of livelihoods which depend on its seasonal fluctuations to renew fish stocks, farmland and rangeland. This paper describes how access to farmland and fishing rights has evolved on the Nigerian shore of the lake. The paper aims to assess the applicability of different institutional approaches to natural resource management on the lake shore. Although many recent approaches to natural resource management have reflected a 'Tragedy of the Commons' approach, a growing literature both in support and critical of Hardin's (1968) thesis has followed. Four distinct approaches are considered: (1) institutional intervention to prevent 'tragedy'; (2) institution erosion brought about by such interventions; (3) models of institutional adaptation to resource scarcity; and (4) approaches which perceive institutions as a crucial determinant of social and economic development. In examining which institutional approaches may be relevant at Lake Chad, it is anticipated that this paper will provide insights which will be relevant to policy-makers, resource managers and students working in environments where resource fluctuation inhibits stable property rights and state resource management has proved neither feasible nor successful. The western shore of Lake Chad has been under the jurisdiction of Borno State in its various guises since the end of the fourteenth century and is currently one of 36 states in the Federal Republic of Nigeria. Although the administrative status of Borno itself has varied, it has been dominated by a Kanuri aristocracy for most of its existence. The Kanuri administration has continued to operate in a remarkably similar way over the past 150 years. Traditionally, it has played a crucial role in allocating access to farm land. In recent years, the 'Kanuri administration' has not only maintained its pre-colonial authority over farming on the lake shore, but has expanded it to cover new areas of the lake floor and the increasingly lucrative fishing opportunities which federal government has been unable to regulate. This success suggests that collaboration with the organisations which operate such institutions could be beneficial, if not essential, to the success of natural resource management.

Agriculture↗

The CHAD and HAD regimens in advanced ovarian cancer: combination chemotherapy including cyclophosphamide, hexamethylmelamine, adriamycin, and cis-dichlorodiammineplatinum(II).

Combination chemotherapy consisting of hexamethylmelamine, adriamycin, and cis-dichlorodiammineplatinum(II) was given to 27 patients with advanced epithelial ovarian cancer whose disease had progressed while receiving therapy including alkylating agents. Eighteen patients (67%) had objective partial or complete remissions for a projected median duration of 7 months. Based on this high level of activity in this poor-risk group, the three drugs were combined with cyclophosphamide in a four-drug regimen (CHAD) for initial therapy suitable for outpatient administration. Nineteen of 21 evaluable patients (90.4%) receiving CHAD responded. Complete clinical remissions were noted in ten patients (47.6%) and were confirmed at "second-look" laparotomy in two of these. An additional five patients without evaluable disease after initial surgery are free from relapse at 4--15 months. Toxicity was only moderately severe; 28% of the patients had wbc counts less than 2000/microliters at some point. Nephrotoxicity from cis-dichlorodiammineplatinum(II) was almost completely prevented by a 2-hour outpatient regimen of hydration and diuresis. A prospective randomized trial is planned comparing CHAD to melphalan in previously untreated women with advanced ovarian cancer.

Adult↗

Pliocene large-mammal assemblages from Northern Chad: sampling and ecological structure.

Numerous Pliocene large-mammal assemblages have been discovered in Chad over the last decade. They offer a unique opportunity to understand the settings in which important chapters of Hominid evolution took place in Central Africa. However, it is crucial to first investigate both sampling and taxonomic homogeneity for these Chadian assemblages because they occur over large sectors in a sandy desert that offers virtually no stratigraphic section. Using cluster analysis and ordination techniques, we show that the three Pliocene sectors from Chad are homogeneous and adequate sampling units. Previous stable isotope analyses on these assemblages have indicated that the environment became richer in C(4) plants between approximately 5.3 and 3.5-3 Ma. To test whether this environmental change has affected the structure of palaeo-communities, we assigned body mass, trophic and locomotor eco-variables to mammal species from the three sectors. Statistical analysis shows that the overall ecological structure of the assemblages is not linked with the opening of the plant cover, and eco-variables show no temporal trend from the oldest sector to the youngest. For example, there is no significant change in the relative diversity of grazing and browsing taxa, although mixed feeders are less diversified in the youngest sector than in the preceding one. This pattern apparently does not result from potential biases such as methodological artefacts or taphonomic imprint. Instead, it seems that local heterogeneous environmental factors have played a major role in shaping the ecological spectrum of Chadian mammal palaeo-communities during the Pliocene.

Animals↗

Morbidity and nutrition patterns of three nomadic pastoralist communities of Chad.

As a part of an interdisciplinary research and action programme, morbidity and nutritional patterns were assessed in three nomadic communities: Fulani and Arab cattle breeders and Arab camel breeders, of two prefectures in Chad. The predominant morbidity pattern of Chadian nomadic pastoralists (representing approximately 10% of the total population of the country) had not been documented so far. A total of 1092 women, men and children was examined by a physician and interviewed during two surveys in the dry season and one in the wet season (1999--2000). Participants with no complaint were rare. Pulmonary disorders (e.g. bronchitis) were most often diagnosed for children under 5 years of age. Of the adult participants, 4.6% were suspected of tuberculosis. Febrile diarrhoea occurred more often during the wet season when access to clean drinking water was precarious. Malaria was only rarely clinically diagnosed among Arabs during the dry season, whereas Fulani, who stayed in the vicinity of Lake Chad, were also affected during this period. A 24-h dietary recall showed that less Arab women than men consumed milk during the dry season (66% versus 92%). Malnutrition was only documented for 3 out of 328 children (0--14 years). Arab women in childbearing age had a higher proportion of children not surviving when compared to Fulani women (0.2 versus 0.07). This study identified several implications for reseach and interventions in nomadic settings. Innovative and integrated health services for nomads can possibly be extended to many settings as nomadic pastoralists have in common a similar way of life driven by the needs of their animals.

Adolescent↗

Community health outreach program of the Chad-Cameroon petroleum development and pipeline project.

A critical appraisal has been presented of the CHOP for a large-scale energy infrastructure development project that was implemented in two of the world's poorest countries. The project is under close scrutiny from various independent monitoring groups, civil society organizations, and human rights groups. Reviewing the achievements and shortcomings permits the extraction of important lessons that will be critical for the future adoption of the CHOP in the current setting and for the implementation of additional CHOPs elsewhere in the developing world. The authors believe that the design must be flexible, efficient, and innovative so that a CHOP promptly can address pressing public health issues as they arise (eg, epidemic outbreak) and include the needs and demands of the concerned communities. An innovative feature of the current project is the high degree and mix of public-private partnerships. The project's CHOP also relies on partnerships. As elaborated elsewhere, public-private partnerships should be seen as a social experiment--they reveal promise but are not the solution for every problem. For this CHOP, the focus is on partnerships between a multinational consortium, government agencies, and international organizations. The partnerships also include civil society organizations for monitoring and evaluation and local NGOs designated for the implementation of the selected public health interventions within the CHOP. The governments and their respective health policies often form the umbrella under which the partnerships operate. With the increase in globalization, however, the importance and capacities of governments have diminished, and there is growing private-sector involvement. Private enterprise is seen as an efficient, innovative, pragmatic, and powerful means to achieve environmental and social sustainability. Experiences with the partnership configurations in the current CHOP are of importance for tackling grand challenges in global health by applying a systemic approach. Other innovations of the project in general, and the CHOP in particular, are the strong emphases on institutional-capacity building, integration, and sustainability. In countries like Chad and Cameroon, there are serious shortages of well-qualified health personnel. The CHOP described in this article provides leverage for initiating better healthcare that will reduce the high burden of disease in the developing world. Reducing mortality rates for infants and children younger than 5 years in sub-Saharan Africa requires massive scaling-up of malaria-control interventions (eg, large-scale distribution of ITNs to protect millions of African children), thereby approaching the Abuja targets (see Armstrong Schellenberg et al). The local NGOs that took a lead within the framework of the CHOP in the distribution of ITNs and accompanying health education messages can extend these activities to communities living outside the vicinity of the project area. Serious shortcomings of the current CHOP, consistently identified by the external monitoring groups, include the lack of a regional health plan, cumulative impact assessment, and provision of clean water and sanitation outside the narrowly defined project area. This point is of central importance, particularly for Chad, where access to clean water and improved sanitation facilities is low. Another limitation of the current CHOP is the insufficient amount of significance addressed to tuberculosis and the apparent lack of concerted control efforts against HIV infection, AIDS, and tuberculosis. These criticisms, however, must be balanced against the lack of clarity in international discourse about the proper extent of responsibility of the corporate sector for dealing with the health problems of countries in which they do business. In an elegant analysis, the environmental risk factor "unsafe water, sanitation and hygiene" was shown to be one of the major contributors to loss of healthy life, particularly in the developing world. Provision of clean water and sanitation is a key factor for sustainable control of schistosomiasis and soil-transmitted helminths. Reduction of helminth infections might have a beneficial effect on the HIV and AIDS pandemic. The question still remains: What is, or should be, the scope and limits of responsibility of the corporate sector in solving these problems? There is a critical need for the monitoring and evaluation of the long-term impact of a CHOP that develops in parallel with a large development project, emphasizing the broadest possible determinants of health and well-being. To become operational, it requires the establishment and running of a longitudinal demographic surveillance system in the area and in adjacent areas that are unlikely to be affected by the project. This approach, coupled with regular household surveys for in-depth appraisal of health-seeking and asset indices, is the most promising source of data for impact measurement of health, poverty, and equity-related issues. It will facilitate subtle monitoring and surveillance activities, fostering a truly systemic approach by inclusion of all stake holders on the basis of the existing but constantly evolving system.

Cameroon↗

Where there is no state: household strategies for the management of illness in Chad.

The current structure of the health care system in Chad, which is characterized by a weak public health system and a nascent and largely unaffordable private sector, raises questions about how low-income households manage illnesses. These questions are also compelling because of claims about the potential of oil-related investments to restructure the current landscape of care over the next 25-30 years. This paper focuses on household strategies for treating episodes of malaria reported in an on-going, longitudinal study of household health and access to care in Chad. Treatment of malaria outside the health care system is widespread in endemic areas, therefore it is not surprising that low-income households in this study rely heavily on unregulated drug markets for care. However, the paper shows how self-medication and the use of these drug markets are shaped by the current organization and delivery of care, and are not simply the outcome of a lack of information about the dangers associated with such practices. The paper also shows the consequences of this particular constellation of services for health in low-income households. We see, for example, the emergence of regimes for managing illness that consist of keeping debilitating symptoms at bay through the use of intermittent, sub-optimal therapies that provide a temporary reprieve but not a 'cure.' We also see that households ignore health problems--absorbing them into the experience of everyday life--that might elsewhere demand attention. When illnesses appear as crises it is often because cash-strapped households are unable to sustain this type of management regime, and easily treatable problems spiral out of control. Whether and how the experiences of the low-income households described in this paper will be impacted by the public investment of oil revenues in the health sector is the question our longitudinal study is designed to address.

Chad↗

New material of the earliest hominid from the Upper Miocene of Chad.

Discoveries in Chad by the Mission Paleoanthropologique Franco-Tchadienne have substantially changed our understanding of early human evolution in Africa. In particular, the TM 266 locality in the Toros-Menalla fossiliferous area yielded a nearly complete cranium (TM 266-01-60-1), a mandible, and several isolated teeth assigned to Sahelanthropus tchadensis and biochronologically dated to the late Miocene epoch (about 7 million years ago). Despite the relative completeness of the TM 266 cranium, there has been some controversy about its morphology and its status in the hominid clade. Here we describe new dental and mandibular specimens from three Toros-Menalla (Chad) fossiliferous localities (TM 247, TM 266 and TM 292) of the same age. This new material, including a lower canine consistent with a non-honing C/P3 complex, post-canine teeth with primitive root morphology and intermediate radial enamel thickness, is attributed to S. tchadensis. It expands the hypodigm of the species and provides additional anatomical characters that confirm the morphological differences between S. tchadensis and African apes. S. tchadensis presents several key derived features consistent with its position in the hominid clade close to the last common ancestor of chimpanzees and humans.

Animals↗

First nationwide survey of the health of schoolchildren in Chad.

Survey data are presented from a nationwide survey of the health of schoolchildren in Chad. The country was stratified into distinct ecological zones based on satellite sensor environmental data. Twenty schools were visited and 1024 children aged between 6 and 15 years were included in the study. The overall prevalence of stunting, underweight, anaemia and goitre was 18.7, 16.5, 25.1 and 23.3%, respectively. Schistosoma haematobium, Schistosoma mansoni and hookworm were the only helminth species found with prevalences of 13.2, 1 and 32.7%, respectively. A greater proportion of boys were stunted, underweight, anaemic and infected with S. haematobium and hookworm than girls. Older children were more stunted, underweight and infected with S. haematobium and hookworm than younger children, but less anaemic. The prevalence of infection showed marked geographical heterogeneity, with hookworm prevalence being highest in the Sudanian and tropical zone, and S. haematobium being most prevalent in the Sahelian zone and the Logone and Chari basins in the west of the country. These data show that there is a high prevalence of helminth infection in Chad, but that treatment for S. haematobium and hookworm should be targeted to different geographical areas.

Adolescent↗

"Looking for children": the search for fertility among the Sara of southern Chad.

Despite the long history of infertility and childlessness in Central Africa, and the ongoing demand for treatment of fertility-related problems, the interpretations and experiences of the men and women living in the region vis-à vis the inability to have children remain largely unrecorded. In this paper I examine what the Sara, one of Chad's largest ethnic groups, have to say about fertility problems, and how these views are linked to changes in the social, cultural, and economic landscape of southern Chad in the 20th century. I describe the iterative and inductive process, commonly referred to by the Sara as "doing research," that the Sara use to explore the reasons for the inability to conceive or bear children in the face of multiple reproductive threats. The Sara's causal constructions convey a holistic and multifaceted perspective on this demographic anomaly--a perspective that is missing from most demo graphic and epidemiologic accounts and that has important implications for public health policy and practice.

Adolescent↗

Prevalence of iodine deficiency disorders and goitre in Chad.

A nationwide sample survey was conducted in Chad to establish the prevalence of iodine deficiency disorders (IDD). The country was stratified into the Sahel zone and the Sudan zone, the latter including the city of N'Djamena. The analysis followed a stratification whereby the city of N'Djamena was also separately analysed. A total of 1171 people between 10 and 20 years of age were included in the survey. The overall weighted prevalence of goitre, evaluated by a clinical examination, was 63%. In the Sudan zone the prevalence was 70%, in the Sahel zone 64% and for the capital, N'Djamena, 25%. There were significant differences in the frequency of goitre between the three zones. Females-as established in surveys from other areas and countries-had goitre significantly more often. The prevalence of cretinism varied between 0 and 1.2%, and was highest in the Sahel zone. Amongst the sampled population of the Sudan zone, 33% had less than 20 micrograms/l of urinary iodine, indicating severe iodine deficiency. In the Sahel zone and in N'Djamena the figures reached 8 and 1%. There were high levels of thiocyanate anions in urine reaching medians between 21 and 27 mg/l in the geographical stratas. This probably decreases the bio-availability of iodine. These data show that there is a high endemicity of goitre in Chad and provide a basis for interventions as part of a national action plan against IDD, which will be adapted to the social, cultural and economic situation of the country and to available health services.

Adolescent↗

Community level risk factors for numbers of landmine victims in Chad and Thailand.

STUDY OBJECTIVE: To determine commonalities of landmine victim risk factors in two very different countries. DESIGN AND SETTING: Data on 249 communities in Chad and 530 in Thailand were collected during 2000-2001 as part of the Global Landmine Survey. Community level variables were analysed in a series of Poisson mixture models with number of landmine victims as the dependent variable. Models developed for each country were tested on the other to investigate similarities and robustness of identification of risk factors. MAIN RESULTS: Increased community level risk was associated with population size, closeness to another community with victims, emplacement in the previous two years, blocked water or pasture, and the proximity of unexploded ordnance or anti-tank mines. In Chad, risk factors tended to be more related to identifying communities that had crossed a threshold between near zero and moderate risk; Thailand, factors were more related to increases in victim rates. CONCLUSIONS: Current systems of collecting data on community characteristics and landmine victims can provide meaningful risk factor information. Remediation approaches that focus on blockage of important resources and areas of recent, high intensity conflicts may be the most beneficial in reducing the numbers of victims.

Blast Injuries↗

Unacceptably high mortality related to measles epidemics in Niger, Nigeria, and Chad.

BACKGROUND: Despite the comprehensive World Health Organization (WHO)/United Nations Children's Fund (UNICEF) measles mortality-reduction strategy and the Measles Initiative, a partnership of international organizations supporting measles mortality reduction in Africa, certain high-burden countries continue to face recurrent epidemics. To our knowledge, few recent studies have documented measles mortality in sub-Saharan Africa. The objective of our study was to investigate measles mortality in three recent epidemics in Niamey (Niger), N'Djamena (Chad), and Adamawa State (Nigeria). METHODS AND FINDINGS: We conducted three exhaustive household retrospective mortality surveys in one neighbourhood of each of the three affected areas: Boukoki, Niamey, Niger (April 2004, n = 26,795); Moursal, N'Djamena, Chad (June 2005, n = 21,812); and Dong District, Adamawa State, Nigeria (April 2005, n = 16,249), where n is the total surveyed population in each of the respective areas. Study populations included all persons resident for at least 2 wk prior to the study, a duration encompassing the measles incubation period. Heads of households provided information on measles cases, clinical outcomes up to 30 d after rash onset, and health-seeking behaviour during the epidemic. Measles cases and deaths were ascertained using standard WHO surveillance-case definitions. Our main outcome measures were measles attack rates (ARs) and case fatality ratios (CFRs) by age group, and descriptions of measles complications and health-seeking behaviour. Measles ARs were the highest in children under 5 y old (under 5 y): 17.1% in Boukoki, 17.2% in Moursal, and 24.3% in Dong District. CFRs in under 5-y-olds were 4.6%, 4.0%, and 10.8% in Boukoki, Moursal, and Dong District, respectively. In all sites, more than half of measles cases in children aged under 5 y experienced acute respiratory infection and/or diarrhoea in the 30 d following rash onset. Of measles cases, it was reported that 85.7% (979/1,142) of patients visited a health-care facility within 30 d after rash onset in Boukoki, 73.5% (519/706) in Moursal, and 52.8% (603/1,142) in Dong District. CONCLUSIONS: Children in these countries still face unacceptably high mortality from a completely preventable disease. While the successes of measles mortality-reduction strategies and progress observed in measles control in other countries of the region are laudable and evident, they should not overshadow the need for intensive efforts in countries that have just begun implementation of the WHO/UNICEF comprehensive strategy.

Adolescent↗

Leprosy and disability control in the Guéra prefecture of Chad, Africa: do women have access to leprosy control services?

In a retrospective study, data from the Guéra Leprosy and Disability Control Project in Chad, covering the years from 1992 to 1996, were analysed in order to determine whether there was any indication that the quality of care provided to female leprosy sufferers is inferior to the care provided for male patients. Data from a total of 741 patient registered for MDT, of whom 351 were newly diagnosed cases, are presented and discussed. The data indicate that women have access to diagnosis and treatment and health education. They do not present for treatment later than men, disability rates are lower and they have slightly higher treatment completion rates. Both women and men benefit from footwear and loan programs. More women than men are involved in patient self-help groups. The study shows that in this part of central Chad, there is no evidence of disadvantage for women with leprosy in either diagnosis, treatment or follow-up, but more qualitative data is needed to confirm these findings.

Adolescent↗

Possible illnesses: assessing the health impacts of the Chad Pipeline Project.

Health impact assessments associated with large-scale infrastructure projects, such as the Chad-Cameroon Petroleum Development and Pipeline Project, monitor pre-existing conditions and new diseases associated with particular industries or changes in social organization. This paper suggests that illness self-reports constitute a complementary set of benchmarks to measure the health impacts of these projects, and presents data gathered in ongoing household and health service surveys in Ngalaba, a village near a major oilfield in Chad. In an initial 16-week period of weekly data collection, 363 people reported few of the clinically chronic or asymptomatic conditions expected according to health transition theory, and the overall level of illness reporting was low. Illnesses often were described by symptoms or lay diagnoses. Health care practitioners were consulted rarely; when they were, resources for diagnosis and treatment were limited. Clinically acute, short-duration illnesses (e.g. parasitic infections, toothaches, or hernias) were experienced as chronic conditions and were reported week after week. The low levels of illness reporting and lack of clinically chronic conditions are not taken to mean that rural Chadians are healthy. Rather, the patterns of morbidity reflect a particular local ecology in which health services are organized and care dispensed in ways that limit the possibilities for illness in terms of types of illnesses that can be diagnosed and reported, forms illnesses take, and ways in which illnesses are experienced. Illness self-reports are useful adjuncts to "harder" biological measures in HIAs, particularly in the context of large-scale infrastructure projects with explicit development goals. Rather than providing data on the extent to which harm has been mitigated by corporate, state, and donor activities, self-reports show the possibilities of illness in local contexts.

Cameroon↗

[Trachoma in Chad: results of an epidemiological survey].

A regional survey was carried out in Chad in 2000 and 2001 to estimate the prevalence and severity of trachoma. The main objectives were to describe the epidemiological pattern in terms of prevalence of inflammatory trachoma and blinding complications in two sub-samples of the population: children under 10 years of age and women over 14. Two strata were identified based on geographical criteria: two regions [Ouaddaï-Biltine, North-East] and [Lac-Kanem-Chari Baguirmi, North-West]. Random samples of thirty clusters were selected in each stratum with probability proportional to size. The simplified grading system proposed by the World Health Organisation (WHO) was used. A total of 3,952 children and 2,492 women were examined. The participation in the survey was 95% for the children sample, 92% for the women sample and the representativity of the samples was fairly good. In children under 10 years of age, the prevalence of follicular trachoma (TF) was estimated at 31.5% (IC(95%): 28.6-34.5) and that of intense inflammatory trachoma (TI) at 16.7% (IC(95%) : 14.4-19.2). The severity of the disease is high, as shown by the prevalence of trichiasis-entropion of 1.5% (IC(95%): 0.9-2.2), of central corneal opacity of 1% (IC(95%) :0.6-1.6) and of trachoma-related blindness of 0.5% (IC(95%) : 0.2-1) in women over 14. The epidemiological pattern of trachoma deserves particular attention in the field of public health in Northern Chad, where all indicators are consistently high. The national program for prevention of blindness has prepared a 3-year work plan to implement the SAFE strategy as soon as possible in these areas.

Adolescent↗

[Morbidity patterns in three nomadic communities in Chari-Baguirmi and Kanem, Chad].

Within the framework of an multidisciplinary research and action program, morbidity patterns were assessed in three nomadic communities, i.e., Fulani, Arab cattle breeders and Arab camel breeders, living in Chari-Baguirmi and Kanem, Chad. This is the first data about the health of Chadian nomadic pastoralists who account for approximately 6% of the total population. A total of 1092 women, men and children were interviewed and examined in the course of three surveys carried out by a physician during the dry and rainy season. Nomads reporting no health problems were rare. Tuberculosis was suspected in 4.6% of adults after clinical examination and bronchopulmonary disorders in children less than five years of age. Febrile diarrhea was more prevalent during the wet season when access to clean drinking water was more difficult. Simple malaria was rarely diagnosed in Arabs during the dry season. In contrast simple malaria was frequent in Fulani who stay in the vicinity of Lake Chad during the dry period. Protein-energy malnutrition was observed in only 3 of 328 children younger than 15 years of age.

Adolescent↗