Night blood surveys for filariasis were carried out in two camps of repatriates from Bangladesh. The sample consisted of 1,101 Biharis above one year of age of whom 9.0% were found infected with Wuchereria bancrofti. The infection rate was significantly higher in males (10.2%) than in females (6.7%). Of the three mosquito species (Anopheles stephensi, Culex pipiens fatigans and C. tritaeniorhynchus) collected in and around the camps, 4.1 and 2.5% of C. p. fatigans were found positive for W. bancrofti from the urban and rural camps, respectively. Infective stage larvae were found in the head, thorax and abdomen of C. p. fatigans in the months of May, June and July, suggesting that transmission could have been occurring in May, the hottest and driest month of the year.
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