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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