Abstract
Transmission of the strongylid nematodes of domestic ruminants involves the interaction of a number of factors. First are those factors in the initial host, which significantly influence the biological processes of the parasite involved in the production of infective stages. Secondly, since transmission involves a period when the infective stages are external to the host, environmental factors exert an important influence on the free-living phase of their development. Thirdly, when the infective stages gain access to a new host, parasite-host interactions influence establishment and reproduction of the parasite.These interrelationships influence the seasonal parasite distribution and ensure the persistence of infection in the host.
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