Download Advances in Parasitology, Vol. 66 by David Rollinson, S.I. Hay PDF

By David Rollinson, S.I. Hay

First released in 1963, Advances in Parasitology includes finished and up to date studies in all components of curiosity in modern parasitology. Advances in Parasitology contains scientific experiences on parasites of significant impression, akin to Plasmodium falciparum and trypanosomes. The sequence additionally comprises studies of extra conventional components, comparable to zoology, taxonomy, and existence historical past, which form present pondering and purposes. Eclectic volumes are supplemented by means of thematic volumes on a number of themes together with distant Sensing and Geographical details platforms in Epidemiology and The Evolution of Parasitism--A phylogenetic persepective.

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Extra info for Advances in Parasitology, Vol. 66

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Under conditions of high or hyperendemicity, or during epidemics, reinoculation may be experienced at shorter intervals . . [which] produces a protracted or continuous infection and clinical activity’ (Boyd, 1949). While the number of strains at a given site would be expected to correlate with basic entomologic and epidemiologic variables, the same strain might be present at different sites: ‘The immunity of persons living in regions where malaria is widespread is due to the fact that ever since birth they have been inoculated by an unpredictable number of strains of the different plasmodia, some of these strains having the same antigenic properties as those which they might contract in other endemic regions, even far removed from their original surroundings’ (Brumpt, 1949).

Most concluded that, since observations ‘do not suggest that extensive sexual reproduction has altered the antigenic composition of one strain . . the antigenic characteristics of the parasites upon which immunological differentiation of strains is based, are evidently firmly fixed and retained through an indefinite number of passages through the definitive and intermediate hosts’ (Boyd, 1940a). Huff, however, argued that with ‘parasites which are distinguishable only on immunological grounds .

We have no idea how many strains of each parasite there are in any one locality . . [but] any reduction in anopheline density begins by removing layer after layer of these superimposed infections before it cuts down the amount of malaria, or number of infected persons’ (Hackett, 1937). Because ‘each new strain, like a new species, finds the host defenceless and initiates a train of events culminating in an acute attack, and a period of gametocyte production . . chronic malaria, then, is due to overlapping infections of different species and heterologous strains of plasmodia.

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