Volume 47, Issue 5
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645



Malaria transmission was studied in a newly irrigated area of the Mahaweli project in the dry zone of Sri Lanka. Observations were performed for a three-month period following the northeast monsoon. Parasitemia in the population varied from 20.2% in February to 7% in May, and infection was due to both and . Night catches of mosquitoes collected with human bait included a high proportion of . Mosquitoes containing sporozoites in the salivary glands were identified by an enzyme-linked immunosorbent assay. , and were all implicated as vectors in the area. The highest entomologic inoculation rate, 0.12 infected bites/hr, was observed with and in March. We suggest that a change in the ecosystem from dry zone forest to irrigated cultivated land is the cause of the increased prevalence of in this area and its emergence as a major vector of malaria.


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