Ingwavuma Virus in Thailand

Infection of Domestic Pigs

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  • Departments of Virology, Epidemiology, Veterinary Medicine, and Medical Entomology, U. S. Army Medical Component, SEATO, Department of Microbiology, School of Public Health, Mahidol University, APO San Francisco, California 96346, Thailand
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Ingwavuma virus (ING), a Simbu group arbovirus, was isolated from a pool of Culex vishnui complex mosquitoes in the Chiangmai Valley, Thailand in 1970. ING neutralizing (N) antibody was found in 32% of pigs and 20% of dogs indigenous to the valley, but not in domestic fowl, cattle, or human sera. N antibody was also found in pigs from western, central and northeastern Thailand. From 22 pigs lacking ING N antibody studied in central Thailand from March through June 1972, ING was isolated from the blood of 11 of the 16 with serologically confirmed infections. These findings extend the range of Ingwavuma virus eastward from Africa and India and define the important role of the domestic pig as a host of ING in Thailand.

Author Notes

Formerly School of Public Health. Present address: Faculty of Dentistry, Mahidol University, Yodhi Road, Bangkok, Thailand.

Formerly Department of Epidemiology. Present address: Faculty of Tropical Medicine, Mahidol University, Rajvithi Road, Bangkok, Thailand.