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Weekly
August 30, 1985 / 34(34);531-2
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International Notes Influenza -- Southern Hemisphere, Asia, the Tropics, March-August 1985
Worldwide influenza surveillance from March to August 1985 indicates circulation of influenza virus types A(H3N2), A(H1N1), and B (Table 3). Type A(H3N2) viruses have been isolated most frequently, followed by type B. Influenza type A(H3N2) has often been associated with outbreak activity. Type A(H1N1) viruses have been isolated least frequently, often in association with sporadic cases. Reported by Virus Disease Unit, World Health Organization, Geneva, Switzerland; WHO Collaborating Center for Influenza, Influenza Br, Div of Viral Diseases, Center for Infectious Diseases, CDC.
Editorial Note
Editorial Note: Influenza generally occurs from about April through September in the Southern Hemisphere and often throughout the year in the tropics. Surveillance in these regions may, therefore, identify strains that subsequently appear in the Northern Hemisphere. During the 1984-1985 influenza season, the United States and several other countries in the Northern Hemisphere experienced extensive influenza A(H3N2) activity. It appears that the present activity in the world results from continual spread of those strains, rather than from emergence of a new variant of type A(H3N2) virus. Preliminary laboratory comparisons of viruses from around the world support this view.
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