Mattioli R C, Faye J A, Bah M, Jabang B
International Trypanotolerance Centre, Banjul, The Gambia.
Parassitologia. 1994 Dec;36(3):305-11.
The effects of experimental Trypanosoma congolense infection in Gambian N'dama and Gobra zebu cattle on number of naturally-occurring adult ticks attaching were studied. An indirect fluorescent antibody test was performed to detect serological prevalence of Cowdria ruminantium antibody. The intravenously imposed trypanosome infection did not result in significant (P > 0.05) differences in Amblyomma variegatum and Hyalomma spp. infestations between control and infected N'dama cattle. Control N'damas carried significantly (P < 0.001) lower numbers of A. variegatum and Hyalomma spp. than the control zebus. Serological frequency of C. ruminantium antibody was similar in both control or infected N'dama and in control or infected zebu cattle. No deaths occurred among N'dama cattle, while all six trypanosome infected zebus progressively died within nine weeks post-infection but trypanosomosis was excluded as the primary cause of death. Examined Giemsa-stained blood smears were negative for the presence of tick-borne micro-organisms. Four positive cases of cowdriosis were identified during post-mortem examination. It was concluded that N'damas, even when submitted to trypanosome infection, react consistently better than Gobra zebus to tick attachment. These results emphasize the benefits of rearing disease resistant cattle breeds, such as N'dama, in areas where risks of trypanosomosis and cowdriosis coexist.
研究了冈比亚恩达马牛和戈布拉瘤牛实验性感染刚果锥虫对自然附着的成年蜱数量的影响。进行了间接荧光抗体试验以检测反刍动物考德里氏体抗体的血清学流行率。静脉注射锥虫感染后，对照恩达马牛和感染恩达马牛之间的杂色花蜱和璃眼蜱属蜱虫侵袭情况没有显著差异（P>0.05）。对照恩达马牛携带的杂色花蜱和璃眼蜱属蜱虫数量显著低于对照瘤牛（P<0.001）。反刍动物考德里氏体抗体的血清学频率在对照或感染的恩达马牛以及对照或感染的瘤牛中相似。恩达马牛没有死亡，而所有六头感染锥虫的瘤牛在感染后九周内逐渐死亡，但锥虫病被排除为主要死因。检查的吉姆萨染色血涂片未发现蜱传播微生物。死后检查发现四例考德里氏体病阳性病例。得出的结论是，恩达马牛即使感染锥虫，对蜱附着的反应也始终比戈布拉瘤牛更好。这些结果强调了在锥虫病和考德里氏体病风险并存的地区饲养抗病牛品种（如恩达马牛）的好处。
