Original article - Ethiopian Review

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Species identified Male Female TotalG. Tachinoides 3 1 4G. Pallidips 11 5 16G. Fuscipes 192 103 295Total 206 109 315It is known that establishments of settlement,state farms, development projects and refugeecamps temporarily preclude the tsetse fly from its natural habitat forcing it to retreat to areaswhere there is less human interference. Extensive changes in the vegetation result from forestclearing, which is an integral part of such projects. The impact of these activities on humantrypanosomiasis is significant.In this survey, we were able to testify that densification of thickets previously cleared forsettlement and other development projects had taken place to the extent that the original thicketblocks have now joined together to form continuous ones. This vegetation change has led to thecreation of new game habitats and with it new apartment for Glossina species. G. fuscipes werecaught within three kilometers of the state farm along the AluweroRiver.This is a focal point where the laborers take bath and the neighboring villages fetch drinkingwater. The reservoir host of sleeping sickness, (the bush pig, bush buck, dick dick and the warthog) were also observed in these localities. Hence, such areas need continuous surveillance andmonitoring of the situation regularly. This facilitates the control of peridomestic transmission ofsleeping sickness infection by G. fuscipes as depicted in other countries (9). In this survey trapswere set in all different biotopes where tsetse flies can occupy. However, during the dry seasonsites around springs, ponds and along the river banks were given more attention, as the flies takeshelter in such unfavourable times.The Glossina encountered were G. tachinoides and G. pallidipes both from open grassland andforest vegetation and G. fuscipes dominantly from riverain vegetation. More tsetse flies werecollected from riverain vegetation than the savannah and forest types. This might be attributed tothe prolonged drought, other climatic and ecological factors in relation to the feeding habit oftsetse flies. Moreover, the disappearance of the efficient vector G. morsitans observed during thisstudy needs further investigation.In a known endemic area, the current strategy for sleeping sickness control is regular active casefinding involving population screening and treatment of patients coupled with tsetse fly control(10). Regular surveillance either by a mobile team or trained personnel among the individuals inthe area could make it possible to identify the point of transmission and the source of infection.But, in the absence of active surveillance, epidemics may occur at any time. Once an epidemicoccurs it will have social and economic consequences which may far outweigh the cost ofmaintaining surveillance.Assessment of feasibility of technical, economic and social aspects are all important factors insleeping sickness and tsetse fly control operation, for which community participation would have asignificant impact (10,11 ).Investigation of community perception on the relationship of sleeping sickness and its vectortsetse fly, revealed that respondents in age groups below 16 years recognized this fly as a commonnotorious biting one and identified as "Meio", a vernacular name; but did not have any idea ofsleeping sickness. Those in age groups above 16 years, however, knew sleeping sickness,"Okellakai", the local name for the disease. So, the community as a whole could identify the tsetsefly, but did not see it as a vector for sleeping sickness. Respondents in age groups above 30 years,had noticed the seriousness of the disease. Villagers along the Gilo river area had goodknowledge about the seriousness of sleeping sickness, because the 1970's epidemic had highlyaffected the residents. They commented that a lot of tsetse flies were present in the area at thattime.The view forwarded by the majority of the respondents, specially the young age group in the
study, was that sleeping sickness is not a serious disease and should not be given too muchimportance. This obviously is a wrong impression about the disease. In addition, factors that ledto the decline of sleeping sickness in the Region, specially in Abobo and Gokna-Jor woredas, hadnot been well understood by most of the villagers. That is why they held the view that sleepingsickness is not a serious disease. However, the elders had a notion that during epidemics there hadbeen a lot of tsetse flies in the area and human interference with the ecology (flora and fauna) hadbeen minimum, eventhough they could not understand the role of the flies in the transmission ofsleeping sickness. Therefore, there is some background which could be used to explain thevectorial role of tsetse flies and hence introduce methods of control through communityparticipation. We recommend, regular active surveillance of the endemic region to control thedisease at an early stage before the appearance of epidemic which is more costly both financiallyas well as in human life. Secondly, strengthening of treatment centers, introducing effective andsensitive diagnostic methods and trained man- power should be adopted for monitoring the diseasein the area. Thirdly, specific ecological requirements and feeding habit of Glossina speciesespecially of G. morsitans needs further investigations. Inaddition, a comprehensive study onsocial awareness on sleeping sickness and its vector Glossina species is of importance to controlthe disease.AcknowledgementThis study received financial support from the <strong>Ethiopian</strong> Science and Technology Commission.We are very grateful to the National Research Institute of Health for supports in all logisticsincluding major supplies required for the study. The Regional Health Bureau of Gambella, theRegion 12administration Office, the Gilo clinic staff, the Abobo and Gokna-Jor Woreda administrationoffices are dully acknowledged for their cooperation throughout the study. We are also indebted tothe UNHCR Office at Pinyudo for the station they gave us in their camp during the study.References1. Hutchinson MP, Human Trypanosomiasis in Ethiopia. Ethiop Med J 1971;1:1-69.2. McConnell E, Hutchinson MP. Baker JR. Human trypanosomiasis in Ethiopia: The Gilo riverarea. Trans Roy Soc Trop Med Hyg 1970;64(5):683-691.3. Central Statistics Authority. Population and housing census of Ethiopia: Analytical report onresults for Illubabor; 1984.4. Woo PTK. Evaluation of haematocrit Centrifugation and other techniques for the fielddiagnosis of human trypanosomiasis and filariasis. Acta tropica 1971;28(3):289-303.5. World Health Organization. Trypanosomiasis Control Manual. Geneva. 1983:1-123.6. World Health Organization. Epidemiology and Control of African Trypanosomiasis. TechnicalReport Series 1986;739:PP127.7. World Health Organization. The African trypanosomiasis. Technical Report Series1979;635:87.8. Molyneux DH, Ashford RM. The Biology of Trypanosoma and Leishmania, Parasite of manand domestic animals. Taylor and Francis, London 1983:293.9. Okoth JO. Peridomestic breeding sites of G.fuscipes fuscipes Newst. in Bosoga, Uganda andepidemiological implications for trypanosomiasis. Acta Tropica 1986;43:283-286.10. Kuzoe FAS. Current situation of African trypanosomiasis. Acta Tropica 1993;54:153-162.11. Cattand P. Human African trypanosomiasis. Meeting of interested parties on management andfinancing of the control of tropical diseases other than malaria. CTD/ MIP/WP. 93.9. 1993,Gene
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Page 5 and 6: AcknowledgementThis work has receiv
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Page 11 and 12: Table 2: Distribution of knowledge
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Original articleNatural fermentatio
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The samples were analyzed for proxi
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to increased activity of native or
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Original articleMicrobial load and
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d.Flora assessment: After colony co
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Figure 1: Fate of S. typhimurium an
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to be caused by raw vegetables wher
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control of schistosomiasis in the A
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Figure 2: Close-up photograph of th
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future trends of research on Endod
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AnnouncementThe 8 th Annual confere
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