Abstract
Since helmenthic parasites must enter the human host from an external environment and cannot multiply within the definitive host, the parasite population at a given moment in the host may be characterized by an immigration-death process. The arrival (input) of worms may be of either a random or a contagious nature. A general model is developed and specific relevant discrete distributions are considered. The equilibrium distributions are regarded as the appropriate form to characterize worm populations in hosts inhabiting endemic regions. An application of the model to an epidemiological problem is discussed.
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