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An Outbreak of Mayaro Virus Disease in Belterra, Brazil

II. Epidemiology^*

James W. LeDuc, Francisco P. Pinheiro AND Amelia P. A. Travassos da Rosa

Epidemiological investigations of an outbreak of Mayaro (MAY) virus which occurred in the rural village of Belterra, Pará, Brazil are reported. Human cases were first recorded in December 1977 and continued through June 1978. Approximately 20% of the more than 4,000 persons resident in Belterra were infected, and a very high proportion of those infected suffered overt clinical illness. Cases were identified in all areas of Belterra and among all age groups; however, the greatest number of cases was seen among those who resided in close proximity to the forests. Yellow fever (YF) virus was also active in Belterra concurrently with the MAY virus outbreak. Six human cases of YF were identified, of which five were fatal. The YF outbreak ended following YF vaccination of the human population.

Accepted for publication July 12, 1980.

^* This project was conducted under the auspices of the Ministerio da Saúde Pública do Brasil. The research was conducted at the Instituto Evandro Chagas, Belém, Pará, Brazil, under PAHO Project BPA 4311 and supported by Research Contract Number DAMD 17-74-G-9378 from the U.S. Army Medical Reserch and Development Command, Office of the Surgeon General, Washington, D.C. The opinions contained herein are those of the authors and should not be construed as official or reflecting the views of the Department of the Army.

Address reprint requests to: Reprints Section, Division of Academic Affairs, Walter Reed Army Institute of Research, Washington, D.C. 20012.

Present address: Gorgas Memorial Laboratory, APO Miami 34002.

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