Volume 72, Issue 3
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645


We monitored diel-landing periodicity (biting activity/cycle) of and the infection/infectivity pattern through human-landing collections on Teressa Island, which is remotely located in the Nicobar district of the Andaman and Nicobar group of Islands of India, for a period of one year. The biting activity was seen throughout the day, exhibiting a bimodal peak, the first at dawn (4:00–6:00 ) and the other towards dusk (5:00–6:00 ). This pattern was similar during all the seasons of the year. Peak biting hours of coincides with the peak appearance of microfilariae. Overall infection and infectivity rates were 2.65% and 0.5%, respectively. Perennial transmission is evident from the records of vectors with parasites (infection), including infective larvae in all months of the year, although no infective mosquitoes were recorded at a few points. The risk of transmission of filariasis based on parity status of was maximal at dusk (5:00–6:00 ) in this region. The issue of control with respect to reducing human-vector contact is discussed.


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  • Received : 12 Jun 2004
  • Accepted : 01 Sep 2004

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