Survival estimates for adult Culex pipiens in the Nile Delta.

In an endemic area for Wuchereria bancrofti filariasis in the Nile Delta, survival of adult female Culex pipiens was estimated by parity rate, mosquito infection and infectivity rates. Infection rates and 4th instar larval populations, as well as infection and parity rates, were linearly correlated. Infectivity correlated only with parity rates. These associations corresponded to parallel changes in ambient temperature. Although survival calculated from parity rates measured longevity of both infected and non-infected Cx. pipiens, survival based on infection and infectivity was a more reliable indicator for parasite transmission.