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Population studies on oncomelania quadrasi the snail intermediate host of schistosoma japonicum in the philippines 1. distribution pattern of the snail in the field



Population studies on oncomelania quadrasi the snail intermediate host of schistosoma japonicum in the philippines 1. distribution pattern of the snail in the field



Japanese Journal of Experimental Medicine 51(3): 179-186



Distribution of O. quadrasi, the snail intermediate host of S. japonicum, was studied in Leyte, Philippines, for the type of distribution based upon a large number of survey data. Among 4 distribution models examined, 3 uneven distribution models, i.e., the double Poisson, Neyman type A and negative binomial, fit well in this order but the Poisson model showed the poorest fitness. The snails appear distributed unevenly over the field with the population mostly consisting of small clusters of individual snails. Elucidation of the snail distribution pattern is necessary for determination of sample size in a snail survey, and for data transformation in a signficance test of the snail density comparison. [This study has implications for humans and vector control.].

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Accession: 006146556

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PMID: 7300032


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