Abstract
Malaria and its local vector, Anopheles darlingi, were eradicated from the coastlands and near interior of Guyana by DDT house-spraying in 1945-51. In the remote interior, where 10% of the population live, only partial control could be achieved, owing to the semi-silvatic habits of A. darlingi and the considerable movement of the sparse population; low malaria endemicity persisted in these areas with occasional localized outbreaks. In the south-west the problem was further complicated by the presence of malaria across the frontier.
During the years 1961-65, the use of chloroquinized salt was made compulsory over an area of some 109 000 km2, covering a population of 48 500. Satisfactory results were obtained over 84% of this area within 6 months of the start of the campaign; only four cases of malaria were seen in four years. In the south-west, however, an initially favourable trend was reversed in 1962 with the introduction of a chloroquine-resistant strain of Plasmodium falciparum from Brazil. The situation was brought under control by house-spraying with DDT and interruption of transmission is expected.
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