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American Journal of Epidemiology Vol. 113, No. 6: 703-710
Copyright © 1981 by The Johns Hopkins University School of Hygiene and Public Health

other

AN OUTBREAK OF ROTAVIRUS DIARRHEA AMONG A NONIMMUNE, ISOLATED SOUTH AMERICAN INDIAN COMMUNITY

ALEXANDRE C. LINIARES1,, FRANCISCO P. PINHEIRO1, RONALDO B. FREITAS1, YVONE B. GABBAY1, JANE A. SHIRLEY2 and GRAHAM M. BEARDS2

1Instituto Evandro Chagas, fundacáo Servicos de Saóde Pública, Ministério da Saúde, Av. Almirante Barroso 492, Belém, Pará, Brasil.
2Regional Virus Laboratory, East Birmingham Hospital Bordesley Green East, Birmingham B9 5ST

Reprint requests to Dr. Linhares.

Linhares A. C. (Institute Evandro Chagas, Fundaçäo Serviços de Saüde Publica, Ministério da Saüde, Belém, Pará, Brasil), F. P. Pinhelro, R. B. Freitas, Y. B. Gabbay, J. A. Shirley and G. M. Beards. An outbreak of rotavirus diarrhea among a nonimmune, isolated South American Indian community. Am J Epidemiol 1981; 113: 703-10.

During July-August 1977, an outbreak of acute diarrhea occurred in an unusually isolated population, the Tiriyo indians, who live in the north of Para, Brazil, near the border with Surinam. Diarrhea was reported by 157 (70%) of the 224 Indians living in the village during the epidemic. There was one fatal case in a one year old child. Rotavirus was detected by electron microscopy in one fecal specimen collected from an acute case of diarrhea. Seroconver-sions were noted in 127 out of 168 (75.6%) paired serum samples tested for rotavirus antibody by counter-immunoelectrophoresls. With immunofluores-cence based neutralization tests, rotavirus serotype 1 (Birmingham) was shown to be associated with the outbreak. The Infection also boosted type 3 antibodies but this was most apparent in persons with pre-existing type 3 titers and the boost was not as great as with type 1. All age groups were affected. The proportion symptomatic was greatest in young children.

diarrhea; disease outbreaks; Indians, South American; rotavirus


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