Download e-book for iPad: Advances in Parasitology, Vol. 3 by Ben Dawes (ed.)

By Ben Dawes (ed.)

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1959). The course of the infections with T. brucei and T. rhodesiense did not differ. g. Phacochoerus (warthog), Potamochoerus (bushpig), Sylvicapra (duiker), Redunca (reedbuck), Aepyceros (impala), Taurotragus (eland), and Tragelaphus (bushbuck), typically survived. In most of the latter group of animals evidence was obtained that parasites may persist in the blood in populations too scanty for detection by microscopy but sufficient to infect subinoculated animals or Glossina, for long periods, up to at least 20 months.

Brevipalpis showed much lower proportions of young flies during the waves of activity near sunrise and sunset and during the night than in the middle of the day. No differences in the age constitution of the catch related to time of day were detected in the case of G. palpalis fuscipes (Harley, in EATRO, 1962-63). Glover and his co-workers (Kenya, 1957; Power, 1964) found G. longipennis to be active just before sunset and at dawn, particularly the former, largely inactive during the day. Thus catches confined to the day are unlikely to indicate the true prevalence of the species.

In further studies, these workers (Willett and Gordon, 1957; Gordon and Willett, 1958) have considered this result in relation to the establishment of T. brucei subgroup infections in man, monkeys, guinea-pigs, rabbits and rats. The main point at issue was whether or not metacyclic trypanosomes inoculated by the bite of Glossina went through a special cycle of development leading to the appearance of blood forms in the peripheral blood of the host at the end of the prepatent period. In the rabbit, but not in the monkey, guinea-pig or rat, there is a local multiplication of trypanosomes at the site of inoculation, the trypanosome chancre, whether the inoculation is of metacyclic trypanosomes by Glossina bite or of blood forms by intradermal injection.

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