Further Isolations of Arboviruses from Mosquitoes Collected in Tongaland, South Africa, 1960–19681

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Abstract
Over a period of 8.5 years 168,231 mosquitoes, including at least 52 species, were collected in a Game Reserve and tested for infection with arboviruses. Fifty-two isolations, including strains of Sindbis, Middelburg, Ndumu, Wesselsbron, Spondweni, Bunyamwera, Shokwe, Germiston, Pongola, Mossuril, Lebombo, Ingwavuma and Simbu viruses were made from 5 species of mosquito. The most frequently infected species, Aedes (Neomelaniconion) circumluteolus (Theobald), yielded 37 strains which included strains of 11 arboviruses. The appearance of particular viruses was intermittent and it was not possible to incriminate any single species fundamentally in the survival of these viruses. Seven species comprised 96% of the total number of mosquitoes tested and it seemed possible that unidentified vectors may be among species collected in small numbers.

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