By Ben Dawes (ed.)

ISBN-10: 0120317036

ISBN-13: 9780120317035

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Sample text

Cunningham and Harley (1962) allowed wild G . pallidipes to feed on a lake of defibrinated bovine blood through a membrane. Immediately after they had fed the blood was shown to be infective to mice (T. brucei subgroup) by intraperitoneal inoculation and was, therefore, presumed to contain metacyclic forms derived from the flies. Part of the same lake, - 80” C frozen for 21 days, tested in the same way, was found to be infective. 4. Trypanosome Culture Lehmann (1960, 1961, 1962) indicated which culture media are most suitable for the several species of African pathogenic trypanosomes and drew attention to culture as a possible method for distinguishing 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.

1. In the Laboratory a. Physiology. The process of feeding in Glossina morsitans has been studied by Gordon et al. (1956) by direct observation of the behaviour of the haustellum in the ear of the mouse and by histological study of the host tissues at the site of the bite. Essentially, the insertion of the haustellum (labrum, hypopharynx and labium) is mediated by the rapid eversion and inversion of the labial labella and their attached rasps, though the action of this cutting tool may be assisted by thrusts of the head of the fly, particularly during the stage of penetration of the stratum corneum.

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Advances in Parasitology, Vol. 3 by Ben Dawes (ed.)


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