Epidemiologic Notes and Reports Influenza Update -- United
States
Influenza A(H1N1) virus has been isolated from 1 of 2 patients
surveyed in a focal outbreak of influenza at a juvenile correction
institution in Sacramento, California. An estimated 40%-50% of the
100 inmates were affected. An additional 4 isolates of influenza
A(H1N1) virus and 3 of type B virus, all associated with
geographically scattered cases, were reported from California. Two
influenza A(H1N1) viruses and 1 type B virus have been isolated in
Oregon, the first for that state this season. The isolations were
associated with sporadic influenza cases occurring in late January
or
early February. Influenza activity in Tucson, Arizona, has
declined.
School absenteeism in Tucson has returned to normal levels, and
influenza virus was not isolated there during the first 2 weeks of
February. The largest number of virus isolations continues to be
reported from Houston, Texas, where the Influenza Research Center
has
identified a total of 159 type B and 21 type A(H1N1) influenza
viruses
this season through active clinical surveillance. Despite the
large
number of isolations, no outbreaks of influenza have been
documented
in Houston.
Reported by P Hom, MD, Sacramento County Health Dept, J Chin, MD,
State Epidemiologist, California State Dept of Health Svcs; W
Murphy,
PhD, J Googins, MD, State Epidemiologist, Oregon Dept of Human
Resources; R Worrell, RN, P Noland, MD, Pima County Health Dept, L
Minnich, G Ray, MD, University Hospital, Tucson, J Sacks, MD,
Acting
State Epidemiologist, Arizona Dept of Health Svcs; P Glezen, MD,
Influenza Research Center, Baylor College of Medicine, Houston, C
Webb
Jr, MD, State Epidemiologist, Texas Dept of Health; WHO
Collaborating
Center for Influenza, Center for Infectious Diseases, CDC.
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