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Isolation of Yellow Fever Virus from Haemagogus Mesodentatus, H. Equinus and Sabethes Chloropterus Captured in Guatemala in 1956

A wave of sylvan yellow fever has been progressing steadily northward in Central America in recent years. The first cases since 1905 were identified in Panama in the late fall of 1948 (Herrera et al., 1949). Since that time, outbreaks have appeared successively in Costa Rica, Nicaragua and Honduras. Data concerning these outbreaks have been reviewed by Soper (1955). Near the beginning of the year 1956 the northward sweep reached Guatemala, and arrangements were made by the Pan American Sanitary Bureau with the Gorgas Memorial Laboratory to attempt virus isolations from mosquitoes captured in areas showing yellow fever activity. The staff of the Gorgas Memorial Laboratory has been interested in the problem of the Central American vectors of the disease for a number of years. Trapido and Galindo (1955) and Galindo and Trapido (1956) have shown that the principal South American vectors, Haemagogus spegazzinii together with its subspecies falco, and Aedes leucocelaenus, are scarce or do not occur at all in certain areas of Central America where sylvan yellow fever outbreaks have appeared.