Snail population in running water

Mathematical Models of Schistosomiasis

“…Coutinho & Coutinho [(12); see (13) for errata] explain two generalizations from previous empirical work. The fi rst generalization is that D = A /(B + p), where D is an index of the size of B. glabrata snails in a lake and p is the prevalence rate among those snails of infection with S. mansoni.…”