The CDC report analyzed over 124,000 respiratory specimens and found that 10.9% tested positive for influenza. The majority (89.3%) were influenza A viruses, with most (99.1%) being influenza A (H3). All influenza viruses tested showed sensitivity to the antiviral drugs oseltamivir and zanamivir. Widespread influenza activity was reported in 14 states with regional activity in an additional 25 states and territories. Hospitalization rates were highest among adults aged 65 and older and children aged 0-4.

1. 139 influenza viruses have been assessed for
sensitivity to anti-virals:
5 pH1N1 106 influenza A (H3N2) 28 influenza B
All showed sensitivity to oseltamivir and zanamivir.
Source CDC Report: Morbidity and Mortality Weekly Report (MMWR)
Update: Influenza Activity — United States, September 28–December 6, 2014
Weekly, December 19, 2014 / 63(50);1189-1194
• Approximately 250 labs tested 124,618 respiratory specimens
• 13,641 (10.9%) were positive
• 12,175 (89.3%) were influenza A viruses
• 122 (42.1%) of A were subtyped:
5,077 (99.1%) of these were influenza A (H3)
45 (0.9%) were influenza A (H1N1)pdm09 (pH1N1) viruses
• 1,466 (10.7%) were influenza B viruses
Widespread influenza cases
reported in 14 states:
Colorado, Delaware, Florida,
Georgia, Illinois, Kentucky,
Louisiana, Maryland, Minnesota,
New York, North Carolina, Ohio,
Pennsylvania, and Texas.
Regional cases reported in
25 states, Puerto Rico, and
Guam.
The current Northern Hemisphere trivalent and quadrivalent
influenza vaccines are showing below the expected rate of
effectiveness.
About 50% of influenza A (H3N2) viruses tested have been
reactive.
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Hospitalization rates October 1 - December 6:
1,028 laboratory-confirmed influenza-associated
hospitalizations were reported
(rate of 3.8 per 100,000 population).
The highest rate was among adults aged ≥65 years
(13.4 per 100,000 population)
and young children 0–4 years
(6.2 per 100,000 population).
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