The maximum density of anopheline mosquitoes that can be permitted in the absence of continuing transmission of filariasis |
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Authors: | RH Webber BA Southgate |
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Institution: | Ross Institute, London School of Hygiene and Tropical Medicine, Keppel St., London WC1E 7HT UK |
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Abstract: | Using two years of mosquito collections from two fixed stations on Guadalcanal it was possible to compare the average man-biting rate with the prevalence of microfilaraemia. One area was found to be free of infection while the other still had one positive case. The DDT residual spraying had caused a change in biting habits of A. farauti No. 1 allowing a greater density of mosquitoes to bite man at times when they had lower microfilaria densities. This difference was compared with the pre-spray density so that the maximum permissible number of mosquitoes biting man without transmission of filariasis taking place, could be calculated.A theoretical value for m of 19.84 had been worked out previously, this study gave a corrected observed value of m of approximately 20, very close to the calculated theoretical value. The situation studied here probably showed incomplete interruption of transmission, so it was considered preferable to recommend a figure of 0.66 average vector man-biting rate per hour indoors for the critical value. |
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Keywords: | Reprint requests to: Dr B A Southgate Ross Institute London School of Hygiene and Tropical Medicine Keppel St London WC1E 7HT |
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