The importance of the carrier state of Theileria parva in the epidemiology of theileriosis and its control by immunization

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Date
1973
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Kenya Trypanosomiasis Research Institute
Abstract
A full understanding of the carrier state of theilerial parasites in their mammalian hosts is central for a description of the epidemiology of the disease and for assessing the implications of immunization with live parasites. The carrier state of Theileria has been defined as the ability of an infected and recovered host to infect t~cks which are then able to transmit the parasite to susceptible animals (Leviuc, 1973; Schwabe et al., 1977; Young et a1., 1986). It is possible for an infected host to develop a priGlary parasitosis and parasitacmia that are eventually cleared, leaving the host \vi th n s terile immunity. However, it is recognized that in some Theileria-infected animals, infection persists after recovery and is probably maintained by two phases of the life cycle: first, by the slow proliferation of macroschizon!-infcctcd lymphocytes, some of which develop into microschizonts and give rise to mcrozoites infective to erytk ·ocytes, and, second, by the regular division of intra-ery throcyte piroplasms.
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