H1N1 FLU AND SEASONAL FLU
Caring for Someone Sick at Home
Will you know what to do if someone in your home
gets the flu?
This flu season could be worse than most flu seasons with
more people than usual getting sick. Hospitals and clinics may be much busier
than normal. The good news is that most people with flu will be able to be
cared for at home and will feel better in about a week. Learn what you can do
to help your family this flu season
2009-2010 Influenza Season Week 47
ending November 28, 2009
Synopsis:
During week 47 (November 22-28, 2009), influenza
activity continued to decrease in the U.S.
956 (15.4%) specimens tested by U.S. World
Health Organization (WHO) and National Respiratory and Enteric Virus
Surveillance System (NREVSS) collaborating laboratories and reported to
CDC/Influenza Division were positive for influenza.
Over 99% of all subtyped
influenza A viruses being reported to CDC were 2009 influenza A (H1N1) viruses.
The proportion of deaths attributed to pneumonia and influenza (P&I) was above
the epidemic threshold for the ninth consecutive week.
Seventeen
influenza-associated pediatric deaths were reported. Twelve of these deaths
were associated with 2009 influenza A (H1N1) virus infection and five were
associated with an influenza A virus for which the subtype was undetermined.
The proportion of
outpatient visits for influenza-like illness (ILI)
was 3.7% which is above the national baseline of 2.3%. Eight of the 10 regions
reported ILI at or above region-specific
baseline levels. Regions 6 and 10 reported ILI
below their region specific baselines. Twenty-five states reported
geographically widespread influenza activity, 17 states reported regional
influenza activity, the District of Columbia,
Puerto Rico and six states reported local influenza activity, and Guam, the U.S. Virgin Islands and two states reported
sporadic influenza activity.
*Influenza season officially begins each year at week 40. This
season data from week 35 will be included to show the trend of influenza
activity before the official start of the 2009-10 influenza season.
WHO
and NREVSS collaborating laboratories located in all 50 states and Washington D.C.,
report to CDC the number of respiratory specimens tested for influenza and the
number positive by influenza type and subtype. The results of tests performed
during the current week are summarized in the table below.
|
|
Week
47
|
|
No.
of specimens tested
|
6,224
|
|
No.
of positive specimens (%)
|
956
(15.4%)
|
|
Positive
specimens by type/subtype
|
|
Influenza
A
|
950
(99.4%)
|
|
A (2009 H1N1)
|
708
(74.5%)
|
|
A (subtyping not performed)
|
233
(24.5%)
|
|
A (unable to subtype)*
|
8
(0.8%)
|
|
A (H3)
|
1
(0.1%)
|
|
A (H1)
|
0
(0.0%)
|
|
Influenza
B
|
6
(0.6%) |
|
|
*Subtyping
results for the majority of specimens in this category were inconclusive
because of low virus titers.
During week 47, seasonal influenza A (H3N2) and influenza
B viruses co-circulated at low levels with 2009 influenza A (H1N1) viruses.
Over 99% of all subtyped influenza A viruses reported to CDC this week were
2009 influenza A (H1N1) viruses
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