Trypanosome infection rate in the tsetse species, Glossina pallidipes Austen, in a rural situation in Kenya

1981 ◽  
Vol 1 (04) ◽  
pp. 411-416
Author(s):  
Mary L. A. Owaga
1962 ◽  
Vol 53 (3) ◽  
pp. 541-550 ◽  
Author(s):  
R. D. Pilson ◽  
B. M. Leggate

In a continuation of studies of diurnal and seasonal feeding activity of Glossina pallidipes Aust. in thick riverine vegetation at Rekomitjie, in the Zambezi Valley, Southern Rhodesia, flies attracted to a stationary black ox were allowed to become engorged, then caught, marked and released. More flies fed per day in the late dry season (November), and fewer during the rainy season (February), than at other times of the year. The proportions of females amongst flies feeding, and of marked flies recaptured, were greatest in May (77·6 and 20·0 per cent., respectively) and least in November (59·2 and 7·7 per cent., respectively). The diurnal pattern of feeding activity was similar in all seasons, there being a well-marked peak of activity at or shortly before sunset.The trypanosome infection rate was obtained by dissecting flies caught near the experimental site and was combined with figures for the number of flies attacking the ox to give an estimate of the seasonal trypanosome risk (mean number of infected flies that fed on the ox per day); this was greatest in November and smallest in February.From comparison of catches off a moving and a stationary ox, two stationary oxen standing together, and two standing out of sight of one another, in each case one being red and the other black, it appears that colour of the bait-animal is not of great importance as an attractant to G. pallidipes unless a definite choice is presented, when flies show preference for feeding on a dark surface.


1972 ◽  
Vol 62 (2) ◽  
pp. 183-193 ◽  
Author(s):  
Frank L. Lambrecht

Epidemiological studies of Rhodesian sleeping sickness and its vector Glossina morsitans Westw. were made near Motsowi in the western floodplains of the Okovango Swamps, Botswana, during 1967–68. The low apparent densities of the fly (12–27 in three fly rounds compared with 124 in a fourth located in a more densely forested area to the east) and low recapture rates (1·3–3·9%) indicated the Motsowi area to be a feeding ground. Peak densities in January and troughs in October reflected seasonal movements of the fly to and from their dry-season retreats to the east. Most bloodmeals (61%) were on warthog, but 5·5% were on reedbuck in which the Trypanosoma brucei infection rate was 33%. In the Motsowi area the total trypanosome infection rate in G. morsitans was 5·7%,, with T. brucei 0·6%, but the rate varied between localities elsewhere in the Okovango. Man's movements into the fly areas to the east offer the main pathway for transmission of T. brucei, perhaps aided by seasonal movements of reedbuck closer to the settlements. The incidence of human trypanosomiasis is therefore unlikely to be reduced by insecticide campaigns in the farming areas, but livestock will benefit from a reduction in cattle trypanosomiasis.


1999 ◽  
Vol 81 (2) ◽  
pp. 107-117 ◽  
Author(s):  
R.A. Tarimo-Nesbitt ◽  
T.K. Golder ◽  
R.D. Dransfield ◽  
M.F. Chaudhury ◽  
R. Brightwell

2020 ◽  
Author(s):  
behablom meharenet ◽  
Dereje Alemu

Abstract Objective : Trypanosomosis is a disease of domestic animals and humans resulting from infection with parasitaemic protozoa of the genus Trypanosoma transmitted primarily by tsetse flies. A cross-sectional study was conducted from January-March 2018, to estimate the infection rate of trypanosome in Glossina tachinoides , their distribution, magnitude and involved trypanosome species in Limmu Kosa District of Jimma zone. Methodology and result : Study methodology involved entomological survey using monoconical traps to study the magnitude of Fly density Flay/Trap/Day (FTD) and tsetse fly dissection to estimate infection rate of trypanosome in vector flies. The study result indicated that there was only one species of Tsetse fly Glossina tachinoides detected with FTD=4.45. From total of (n=284) dissected Glossina tachinoides flies only (n= 5) positive for Trypanosome resulting in 1.76% Infection Rate. Peak trypanosome infections were observed in female tsetse 2.04%, n=4 and 1.14%, n=1 in males. Furthermore, 1.06% Glossina tachinoides were infected by Trypanosome vivax and the remaining 0.70% was Trypanosome congolense . Keywords : Limmu Kosa District, Trypanosome, Infection Rate, Glossina tachinoides


2019 ◽  
Author(s):  
Behablom Meharenet ◽  
Dereje Alemu

Abstract Objective: Trypanosomosis is a disease of domestic animals and humans resulting from infection with parasitaemic protozoa of the genus Trypanosoma transmitted primarily by tsetse flies and other hematophagous flies. The study was conducted to estimate the infection rate of trypanosome in vector flies and involved parasite species. Result: The study result indicated that there was only one species of Tsetse fly Glossinatachinoides detected with high Flay/Trap/Day = 4.45. Total of n=284 tsetse flies were dissected and n= 5 positive for Glossinatachinoidesresulting in 1.76% infection rate. Higher trypanosome infections were observed in female tsetse with significant infection rate of 1.41%, n=4 and 0.35%, n=1 in males. Furthermore, 1.06% of the trypanosome infections carried by Glossinatachinoides were classified as Trypanosomavivax and the remaining 0.70% was Trypanosomacongolense.The study confirmed the absence of human trypanosomosis in study area with only identified trypanosome parasites were Trypanosomavivax and Trypanosomacongolense. However, the resulted FTD= 4.45 recommend control and suppression of the vector and parasite is mandatory due to Pathogenic Animal Trypanosomosis.


Sign in / Sign up

Export Citation Format

Share Document