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Factors affecting variation in the prevalence of Nippostrongylus brasiliensis. The effect of 3 seasonal cycles (A) and seasonal cycles combined with both seasons in each cycle (B). The overall model fit of the minimum sufficient model incorporating both hosts was χ2213 =113.9, P = 1.0, confined to R. norvegicus χ2100 =43.4, P = 1.0 and confined to R. rattus χ2108 =81.7, P = 0.97. See text for significance of individual factors and their interactions.
