Malaria in the Pare area of Tanzania. V. Malaria 20 years after the end of residual insecticide spraying

Abstract

A malariometric survey, including serology, was done in the South Pare area of the former Pare-Taveta Malaria Scheme, Tanzania, 10 years after the previous survey and 20 years after the end of residual insecticide spraying. Although the densities of the vectors and their infectivity rates have for 10 years equalled those found before malaria control, malaria in the human population is still significantly less. The chief factor in this delayed resurgence is thought to be the increasing use of antimalaria drugs by the population.