Volume 40, Issue 4
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645



In 1985–1987, a field trial of malaria control using deltamethrin impregnated mosquito nets was carried out with 4,450 people in the Buji district, Bao'an County, Guangdong Province, China. The vectors were exophilic (80%) and the endophilic and anthropophilic (20%). The first impregnation of the nets was in June 1985 and the second in April 1986. About 87% of the population slept under treated nets.

The indoor vector density decreased by 93% and remained at the same level during the second year. During the second year the average monthly malaria incidence was 1.3‰ for January–June, a decrease of 74.6% as compared with pretreatment data, and 0.85‰ from July to December, a decrease of 92.7%.

In April 1986 and April 1987, the treatment was extended to the whole Buji District, which has a total population of ∼40,000. The average monthly malaria incidence (April–December 1986 and 1987) was 0.54‰ and 0.17‰, a decrease of 64.7% and 89% respectively as compared with the same period for the previous year.


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