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Am. J. Trop. Med. Hyg., 13(5), 1964, pp. 723-727
Copyright © 1964 by The American Society of Tropical Medicine and Hygiene

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The Venezuelan Equine Encephalomyelitis Complex of Group a Arthropod-Borne Viruses, Including Mucambo and Pixuna from the Amazon Region of Brazil*

Robert E. Shope, Ottis R. Causey, Amelia Homobono Paes De Andrade AND Max Theiler
The Belém Virus Laboratory, Belém, Pará, Brazil, and The Rockefeller Foundation Virus Laboratories, New York

Mucambo virus (BeAn 8), previously described as a strain of Venesuelan equine encephalomyelitis (VEE) virus from the Amazon region of Brazil, can be differentiated from VEE virus by hemagglutination - inhibition, complement - fixation and neutralization testing. Pixuna virus, a hitherto undescribed agent isolated in the same region of Brazil in 1961, is related to both VEE and Mucambo, and the three viruses form an antigenic complex in arbovirus group A. VEE and Mucambo are more closely related to each other by all three tests than either is to Pixuna.

A horse inoculated with Mucambo virus developed fever, leukopenia and viremia. Inoculation of Pixuna virus in another horse failed to produce fever or circulating virus, and the horse did not develop viremia after challenge with Mucambo.


* These studies were carried out with the support and under the auspices of the Fundação Serviço Especial de Saúde Pública of Brazil, the Oswaldo Crus Institute and The Rockefeller Foundation, and with the support of the Conselho Nacional de Pesquisas.






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Copyright © 1964 by the American Society of Tropical Medicine and Hygiene.