| introduced schistosomiasis. evaluation as a public health hazard. | schistosomiasis was found in many agricultural workers from yemen who are residing in the san joaquin valley, and a study was done to evaluate the public health hazard of this imported disease. if the necessary intermediate hosts are present, a local focus of infection could be established. numerous biomphalaria obstructa snails collected in the vicinity of the avenue 82 irrigation canal near oasis, riverside county, showed no evidence of natural schistosome infection. laboratory-reared offsprin ... | 1975 | 1114799 |
| schistosomiasis mansoni in yemeni in california: duration of infection, presence of disease, therapeutic management. | investigations of schistosomiasis mansoni in 218 yemeni agricultural workers in the san joaquin valley of california revealed a prevalence of 56%. in those infected, quantitative egg counts performed by the kato thick smear method revealed that 57% had light infections (1-100 eggs/g), 27% moderate infections (101-400 eggs/g), and 16% heavy infections (greater than 400 eggs/g; mean--918 eggs/g). the yemeni had been migrating to the usa for the past 20 years, a period in which the prevalence of sc ... | 1974 | 4451230 |