Fig. 4.

Data on the number of adult female Schistosoma mansoni extracted at autopsy from 96 individuals and fitted negative binomial distribution. Of the 103 cases described in the autopsy study [40], only 96 were used in the analysis. One was excluded for lack of female worm counts, 5 cases were excluded due to treatment with antimonials before investigation, and one case was excluded for being an extreme case of schistosomal colitis, with 1608 worm pairs. The negative binomial distribution was fitted by maximum likelihood, estimating the mean W = 45.51 and overdispersion parameter k = 0.47