Effects of Allium Sativum Ethanolic Extract on Trypanosoma brucei brucei Parasites' Morphometric Parameters and Clinical Outcome in White Albino Laboratory Rats

BACKGROUND Trypanosomosis affects humans as well as wild and domestic vertebrates, yet has no successful prophylaxis, chemotherapy nor cure. OBJECTIVES The study was to investigate the effects of Allium sativum extract on Trypanosoma brucei brucei parasites' morphometric parameters, parasitemia and the clinical outcome in white infected Albino laboratory rats in order to determine its trypanocidal effects. METHODOLOGY The study was conducted at the department of Biological Sciences Laboratory of the Moi University Eldoret. Thirty two (32) mature rats randomly divided into four groups (M, N, P and Q) were kept in four (4) cages in a well ventilated room, with adequate light supply in the day. Sixteen (16) rats were infected with T. b. brucei (1.0 x 104 parasites per rat); eight (8) of which (Group N) were treated with the A. sativum ethanolic extract on day 5 and day 9 after infection, while the other eight (8)rats (Group Q) received saline treatment on the same days. Sixteen (16) non-infected rats (controls) were also divided into two groups of eight rats each (P and M) and treated as in group N and Q, respectively. The rats were obtained from University of Nairobi, Chiromo Campus. RESULTS All infected rats became parasitemic two days after infection and reached peak levels on day 4 and 5 post infection. Parasitemia in saline treated infected rats fluctuated between 4025.5 ± 0.05 - 5544.4 ± 0.05 parasites per 200WBC whereas in the extract treated rats parasitemia declined from 6976.6 ± 0.05 - 311.0 ± 0.05 parasites per 200WBC after the first treatment. Uninfected saline treated rats maintained normal Hb level (10.6g/L to 11.8g/L) as compared to the uninfected extract treated rats' whose Hb levels was at 13.41g/L to 14.36g/L. The haemoglobin level changed to 8.0g/L four days after the infection in the group N rats before rising to 10.2g/L on day 8 post-infection following the extract treatments. Group Q rats' Hb declined to 6.43g/L by the end of the study. RBC count of the infected saline treated rats declined to 3.38 x 106/µL as compared to 4.93-7.61 x 106/µL in the normal rats by 11 days postinfection.There was however no significant change in WBC, temperature and weight between the saline extract treated rats. The extract produced a shrinking effect on the parasite's body with some of the morphometric parameters appearing significantly (P<0.05) reduced as observed under a microscope with ocular and stage micrometer scale. The mean nucleus, posterior ends to nucleus centre, the nucleus centre to the anterior end and the body length were reduced from 2.41µm to 1.42µm(P=0.00), 4.42µm to 3.68µm(P=0.017) , 4.65µm to 4.18µm(P=0.001) and 8.58µm to 7.19µm(P=0.001) respectively. CONCLUSION In conclusion it was evident that, A. sativum ethanolic extract exhibited Trypanocidal effects that can be exploited to control clinical progression of Trypanosomosis in rats. In addition, the data presented demonstrates the plant extract had the potential to improve the red and white blood cell indices reducing parasitaemia following T. b. brucei infection. These findings suggest that, the garlic extract affected the plasma membrane of the parasites since shrinking was only possible with disrupted membrane biochemistry

Anti-trypanosomal Activity of Potential Inhibitors of Trypanosoma brucei Glycolytic Pathway Enzymes Selected by Docking Studies

Human African trypanosomiasis (HAT); a potentially fatal protozoan infection caused by tsetse-fl mediated transmission of Trypanosoma brucei (T. Brucei); is largely recognized as a neglected disease. The repertoire of drugs that is effective against the infection is limited and all drugs have several drawbacks including high level of toxicity; difficult administration regimens; and the resurgence of resistance. At present the biology of the parasite is well studied and a number of technologies are now available which can aid in the identifiation of potential drug targets. This review identifis putative inhibitors of trypanosomal glycolytic enzymes

Transmission of Human African Trypanosomiasis in the Komo-Mondah focus; Gabon

Knowledge about transmission of sleeping sickness in a given focus is of a great importance since it governs the efficacy and the cost-effectiveness of control strategy. The Komo-Mondah focus is the most endemic sleeping sickness focus of Gabon. This focus has hardly been investigated and available publications are more than thirty years old. In order to update transmission features of sleeping sickness in that focus; we have conducted epidemiological and entomological surveys in March-April 2008. Methods: Epidemiological investigation relied on a case-control study using a quantitative and qualitative methodology (a structured questionnaire). Cases were affected people (parasitological positive) diagnosed by the national control program from 2004 to 2007; controls were those found disease-free after clinical examination and biological tests in the same period. They were asked to respond to a standard questionnaire concerning their activities after having signed a written consent. An unvaried analysis was first performed and then a multivariate analysis using the conditional logistic regression for matching method. Traps were then set out for four days in areas where people were working. Tsetse flies captured were identified and dissected; their density and human-fly contact points were determined. Results: A risk of infection was associated with fishing activities (Odds-ratio: 5.69; CI95: 3.38-9.57). Three species of Glossina were captured: Glossina palpalis palpalis; Glossina fuscipes fuscipes and G. Caliginea. Human-fly contact points were mainly landing stages. Conclusion: A combined strategy of case-detection and vector control targeted at landing stages should be efficient against the disease

Histoire du foyer de la trypanosomes humaine africaine de nola en republique Centrafricaine; de 1971 a 2004

La trypanosomiase humaine africaine (THA) ou maladie du sommeil; affection redoutable qui fit jadis beaucoup de ravages au sein des populations dans differentes regions d'Afrique dont celle de Nola en Republique Centrafricaine (RCA); reste un probleme de sante publique en Afrique sub-saharienne. La cinquante sixieme assemblee mondiale de la sante; tenue le 26/03/2003; reconnaissait que les douleurs; les souffrances et la mortalite dues a la trypanosomiase menacent quotidiennement plus de 60 millions d'habitants dans plus de 37 pays d'Afrique sub-saharienne dont 22 comptent parmi les moins avances. Nous rapportons ici; l'histoire du foyer de THA de Nola en RCA; de 1971 a 2004. Sur le plan methodologique; il s'agit d'une etude retrospective couvrant la periode de 1971 a 2004. Sur des fiches d'enquete etablies; nous avons collecte des donnees a Nola a partir des registres des trypanosomes et a Bangui la capitale; a partir des rapports des missions de prospection de depistage actif. L'analyse des donnees a ete faite a l'aide du logiciel EPI INFO 6 version 2000. De 1971 a 2004; 3348 patients ont ete recenses parmi lesquels 1814 anciens malades et 1534 nouveaux cas. Les femmes etaient plus atteintes (54) que les hommes avec un sex-ratio de 1;2. La tranche d'age la plus touchee est celle de 20 a 29 ans (67;0). L'indice de morbidite nouvelle (IMN) est passe de 0;01en 1971 a 1;7en 1991 et a 0;05en 2004. L'indice de contamination totale (ICT) est passe de 0;05en 1971 a 2;3en 1989 et a 0;05en 2004. Les cas de rechutes et de reinfections representaient 54;2entre 1992 et 2004. La majorite des malades depistes etaient en 2eme phase (64). La lutte anti-vectorielle avec pose de pieges coniques impregnes d'insecticides a ete primordiale dans la maitrise de l'epidemie dans cette region

Factors Influencing Individual and Community Participation in the Control of Tetse Flies and Human African Trypanosomiasis in Urambo District; Tanzania

This study was carried out to assess the knowledge and level of individual and community participation in the control of Human African trypanosomiasis in Urambo District; western Tanzania. Semi structured questionnaires were used to collect information from individuals at house hold level. Retrospective data of HAT was sought from the medicalofficers in-charge of health facilities. The results indicate that; 191 (90.5 ; n = 211) individuals knew tsetse flies and 187(88.6; n=211) knew HAT. All nine key informants reported that; the communities were aware of HAT while seven key informants reported that; the communities were aware of health risks associated with tsetse bites in human. There was poor knowledge about the role played by animals in the transmission of HAT (26.7; n=187). Majority of those who knew HAT (n = 187) were willing to contribute labour (70.1) and money (64.2) to tsetse and HAT control whereas amongst those who knew tsetse flies; 66.5 and 60.7 were willing to contribute labour and money; respectively. Amongst those who knew any HAT control technique (n = 108); 78.7 and 82.4were willing to contribute money and labour respectively. A total of 454 cases of HAT were reported in the area from 1999 to 2006. It is concluded that; the factors influencing individual and community participation include the knowledge of tsetse; HAT and control measures

Anti-Trypanosomal potential of momordica balsamina Linn Fruit Pulp extract against Trypanosoma brucei brucei Infection

The search for new trypanocides has not been keenly pursued due to high cost of design and development with no promise of financial returns. Momordica balsamina fruit pulp extract was screened for antitrypanosomal activity in experimental T. brucei brucei infection in rabbits. The extract was administered prior to parasite inoculation; 24 hours post parasite inoculation and on establishment of infection. The treatment was by oral administration of the extract at 500 mg/kg body weight for 14 consecutive days. Parasitaemia was monitored daily while body weight and packed cell volume (PCV) were determined before commencement of studies and subsequently at weekly intervals for 28 days. TThe result showed a significant (P0.05) delay in the establishment of T. b. brucei infection in rabbits treated at 24 hours post parasite inoculation. Packed cell volume also increased significantly (P0.05) in all treated groups when compared to the untreated group (control). This was less in the group treated on establishment of infection. Administration of the extract to the curative group resulted in body weight gain. The other groups suffered weight loss. The infected but not treated group died at day 39 post infection while those treated before parasite inoculation; 24 hours post parasite inoculation; and on the establishment of infection survived for 45 days;53 days; and 61 days respectively. We conclude that M. balsamina pulp extract reduces anaemia in experimentally infected rabbits

Bovine Trypanosomosis in three districts of East Gojjam Zone bordering the Blue Nile River in Ethiopia

Background: Bovine trypanosomosis is a serious constraint to agricultural production in extensive areas of Ethiopia. Methodology: A cross-sectional study was conducted to determine the prevalence of bovine infection with trypanosomes and to identify the prevailed trypanosome species in three districts of the East Gojjam zone bordering the Blue Nile River from March 2005 to February 2006. Cattle from 9 different localities were checked using microscopical examination of wet blood smears; thin and stained bloodsmears; and by blood centrifugation followed by the examination of the resultant buffy coats. Result: Of the total 3;360 cattle investigated; 8.2(3.5; 11.6and 9.4from Dejen; Machakel and Baso-Liben districts respectively) were found to be infected with trypanosomes. Of the total 275 positive animals; 249 (90.5) appeared to be infected with Trypanosoma vivax; 11 (4) were infected with T. congolense; and 15 (5.5) were infected with mixed infection of T. vivax and T. congolense. The prevalence of infection with T. vivax was significantly higher than that of T. congolense (P 0.001). Taking 24-46as normal PCV value; the mean PCV for the trypanosome-infected cattle (22.09) was lower than those for the trypanosome-negative animals (26.03). Conclusion: Trypanosomosis is a disease of considerable importance to the major economic districts bordering the Blue Nile River of the East Gojjam zone; Ethiopia; given the disease's potential to threaten the health and productivity of cattle in this region

Human African Trypanosomiasis and challenges to its control in Urambo; Kasulu and Kibondo Districts; western Tanzania

A study was carried out to determine the prevalence and management of Human African Trypanosomiasis (HAT) in Urambo; Kasulu and Kibondo districts of western Tanzania. Parasitological surveys for trypanosome and other blood parasites were conducted in selected villages. Interviews with health workers were conducted to explore facility capacity to diagnose and manage HAT. Community knowledge on tsetse and availability of trypanocidal drugs was explored. Results showed that; although health facility records showed HAT is an important public health problem in the three districts; typanosomes were found in 0.6of the examined individuals in Urambo district only. Malaria parasites with a prevalence of 12.1; 19.7and 9.7; in Urambo; Kibondo and Kasulu; respectively were detected in blood samples from the same individuals examined for trypanosomes. There was poor capacity for most of the health facilities in the diagnosis; treatment and control of HAT. In both districts; communities were knowledgeable of the tsetse identity (82.4) and had experienced tsetse bites (94). The majority (91.4) of the community members knew that they were at risk of acquiring HAT. However; only 29of the respondents knew that anti-trypanocidal drugs were readily available free of charge from health care facilities. Late treatment seeking behaviour was common in Kasulu and Urambo districts. In conclusion; health facilities in western Tanzania are faced with problems of poor capacity to diagnose and manage HAT and that treatment seeking behaviour among the communities at risk is poor. Efforts should be made to strengthen the capacity of the health facility to handle HAT cases and health education to the population at risk

Realite de la trypanosomiase humaine africaine sur la base des diagnostics biologiques

La trypanosomiase humaine africaine constitue un probleme majeur de sante publique en Afrique et particulierement au Mali. Notre etude qui a porte sur la sensibilite; la specificite et la faisabilite des techniques du diagnostic biologique de la THA nous a permis d'evaluer leurs limites de detection au travers des differentes enquetes menees

Paediatric Sleeping Sickness in Kenya : A Case Report

Sleeping sickness is often considered a disease of adults rather than children due to their reduced exposure to the vector. Presumptive diagnosis of sleeping sickness was however difficult since the clinical signs observed were non-specific. This makes clinical diagnosis difficult. Often the disease in children masquerades as a pulmonary infection that is undetectable on x-ray or auscultation. A male child aged two years and eight months was diagnosed with the disease in western Kenya. The patient presented with severe respiratory distress; hepatosplenomegay and neurological symptoms. The disease transmission was associated with the socio-cultural habit of placing children under bushes whilst farming. The implications of delayed diagnosis on response to treatment are discussed