Acquired immunity of a schistosomiasis transmission model--analysis of the stabilizing effects.

A semi-stochastic model for schistosomiasis was developed based on the immune response built up by human host after elapsing a fixed period of time L from the first infection, and on the parasite infection with multiple occurrences. Both acquired immunity and multiple parasite infections reproduced a great endemic stability for the disease and a high value for the basic reproduction ratio. Copyright 1999 Academic Press.