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Influenza -- Southern Hemisphere, Asia, the Tropics, 1984

Influenza usually occurs from about April through September in the Southern Hemisphere and often occurs throughout the year in the tropics. Surveillance in these regions may, therefore, identify strains that subsequently appear in the Northern Hemisphere.

Thus far in 1984, circulation of influenza types A(H1N1), A(H3N2), and B has been detected, with no clear pattern of large increases in one virus type or subtype compared to the others. Recent isolates have most often been associated with sporadic cases or localized outbreaks. Table 1 illustrates the reported influenza virus isolates in the Southern Hemisphere, the tropics, and Asia from April to July 1984. Reported by Virus Diseases Unit, World Health Organization, Geneva, Switzerland; WHO Collaborating Center for Influenza, Influenza Br, Div of Viral Diseases, Center for Infectious Diseases, CDC.

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