Volume 42, Issue 4
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645



Parasitological and entomological parameters of malaria transmission were monitored for 17 months in 3,625 residents in a malaria endemic region in southern Sri Lanka; the study area consisted of 7 contiguous villages where routine national malaria control operations were being conducted. Malaria was monitored in every resident; fever patients were screened and 4 periodical mass blood surveys were conducted. An annual malaria incidence rate of 23.1% was reported during the period: 9.3% was due to and 13.8% was due to there had been a recent epidemic of the latter in this region, whereas the incidence rate in the previous 10 years had been negligible. There was a wide seasonal fluctuation in the malaria incidence, with the peak incidence closely following the monsoon rains. The prevalence of malaria due to both species detected at the 4 mass blood surveys ranged from 0.98% (at low transmission) to 2.35% (at peak transmission periods). Adults and children developed acute clinical manifestations of malaria. Entomological measurements confirmed a low degree of endemicity with estimated inoculation rates of 0.0029 and 0.0109 (infectious bites/man/night) for and , respectively. Several anopheline species contributed to the transmission, and the overall man biting rates (MBR) showed a marked seasonal variation. Malaria at Kataragama, typical of endemic areas of Sri Lanka, thus presents characteristics of “unstable” transmission. Malaria was clustered in the population. There was a low clinical tolerance to malaria, to which most had only recently been at risk, compared to , to which most had had a life-long exposure.


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