Influenza type A(H1N1) virus has now been reported from
sporadic
cases or outbreaks in all regions of the country except the
northwest
Pacific states (Figure 3). In contrast, influenza B virus has been
isolated primarily in the western half of the country, as well as
in
parts of the northeast (Figure 4). As previously indicated (1), in
those regions where circulation of both viruses is occurring, mixed
outbreaks have now been confirmed. In Texas, types A(H1N1) and B
viruses have been isolated from students at four colleges where
outbreaks have been occurring, and similar results have been
reported
from at least one school outbreak each in Illinois and Wyoming.
Other
locations where approximately equivalent numbers of influenza types
A(H1N1) and B viruses have been isolated from recent community
activity include Honolulu, Hawaii, and Houston, Texas.
The elderly have been infrequently reported in this season's
influenza outbreaks. In Utah County, Utah, a single influenza type
B
virus was isolated from an outbreak affecting eight of 79 residents
in
one nursing home late in January. Further laboratory studies are
pending. In addition, no consistent elevation of deaths attributed
to
pneumonia and influenza in the 121 reporting cities has been seen
through the end of January. Influenza A(H3N2) virus remains
generally
dormant; however, during January, sporadic isolates were reported
in
Alaska, Arizona, Massachusetts, Minnesota, New Mexico,
Pennsylvania,
Tennessee, and Texas.
Reported by P Glezen, MD, Baylor University School of Medicine,
Houston, J Taylor, MPH, Texas Dept of Health; J Miner, MD, Utah
County
Health Dept, B Haslam, CR Nichols, Utah Dept of Health; State
Epidemiologists and Laboratory Directors; Statistical Svcs
Activity,
Influenza Br, Div of Viral Diseases, Center for Infectious
Diseases,
CDC.
Reference
CDC. Update: influenza activity--United States. MMWR
1984;33:51-2.
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