STUDIES OF ARTHROPOD‐BORNE VIRUS INFECTIONS IN QUEENSLAND

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Abstract
SUMMARY: Sixty strains of 11 viruses were isolated from 25,901 mosquitoes of 32 species collected at Mitchell River Mission, Cairns and Normanton in 1960 and 1961. The viruses, the local prototype strains and the mosquito species, geographical location and year of repeatable isolations, were:Group A: Sindbis (MRM39) from Culex annulirostris and Aedes normanensis at Mitchell River (1960) and Cairns (1961); AMM2021 (N544) from Anopheles amictus amictus and Culex bitaeniorhynchus at Normanton (1961).Group B: Murray Valley encephalitis virus from C. annulirostris at Mitchell River (1960 and 1961); Kunjin (MRM16) from C. annulirostris at Mitchell River (1960); Kokobera (MRM32) from C. annulirostris at Mitchell River (1960 and 1961); Edge Hill (C281) from Aedes vigilax and C. annulirostris at Cairns (1961); Stratford (C338) from Ae. vigilax at Cairns (1961).Koongol group: Koongol (MRM31) from C. anulirostris at Mitchell River (1960) and Normanton (1961); Wongal (MRM168) from C. anulirostris at Mitchell River (1960 and 1961).Ungrouped: MRM1 (found resistant to ether and sodium desoxycholate) from C. anulirostris at Mitchell River (1960); Mapputta (MRM186) from Anopheles meraukensis at Mitchell River (1960) (not reisolated).C. annulirostris was the commonest mosquito collected (12,124) and the source of 44 of the virus strains.Eight of the viruses appear to be new. One (Murray Valley encephalitis virus) has previously been isolated from man in Australia and two (Sindbis and AMM 2021) from mosquitoes elsewhere.

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