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Posts Tagged ‘influenza A’

Flu hits epidemic levels in U.S.

Posted by feww on January 2, 2015

Influenza Activity Continues to Increase in U.S.

Mortality due to influenza and pneumonia has reached “epidemic” levels in the U.S. as flu activity spreads in 36 states, reported the Centers for Disease Control and Prevention (CDC).

Pneumonia and Influenza (P&I) Mortality Surveillance:

During week 51 (December 14-20, 2014), 6.8% of all deaths reported through the 122 Cities Mortality Reporting System were due to P&I. This percentage was at the epidemic threshold of 6.8% for the week.

Between October 1, 2014 and December 20, 2014, 2,643 laboratory-confirmed influenza-associated hospitalizations were reported. The overall hospitalization rate was 9.7 per 100,000 population. The highest rate of hospitalization was among adults aged ≥65 years (38.3 per 100,000 population), followed by children aged 0-4 years (13.4 per 100,000 population). Among all hospitalizations, 2,529 (95.7%) were associated with influenza A, 100 (3.8%) with influenza B, nine (0.3%) with influenza A and B co-infection, and five (0.2%) had no virus type information. Among those with influenza A subtype information, 760 (99.9%) were H3N2 virus and one (0.1%) was 2009 H1N1.

Synopsis for week 51 [Mirrored from CDC]

  • Viral Surveillance: Of 21,858 specimens tested and reported by U.S. World Health Organization (WHO) and National Respiratory and Enteric Virus Surveillance System (NREVSS) collaborating laboratories during week 51, 6,152 (28.1%) were positive for influenza.
  • Pneumonia and Influenza Mortality: The proportion of deaths attributed to pneumonia and influenza (P&I) was at the epidemic threshold.
  • Influenza-associated Pediatric Deaths: Four influenza-associated pediatric deaths were reported.
  • Influenza-associated Hospitalizations: A cumulative rate for the season of 9.7 laboratory-confirmed influenza-associated hospitalizations per 100,000 population was reported.
  • Outpatient Illness Surveillance: The proportion of outpatient visits for influenza-like illness (ILI) was 5.5%, above the national baseline of 2.0%. All 10 regions reported ILI at or above region-specific baseline levels. Puerto Rico and 22 states experienced high ILI activity; six states experienced moderate ILI activity; New York City and eight states experienced low ILI activity; 14 states experienced minimal ILI activity; and the District of Columbia had insufficient data.
  • Geographic Spread of Influenza: The geographic spread of influenza in 36 states was reported as widespread; Guam, Puerto Rico, and 10 states reported regional activity; the District of Columbia, the U.S. Virgin Islands, and two states reported local activity; and two states reported sporadic activity.

Influenza activity was “widespread” in 36 states during week 51, according to the CDC’s latest FluView report. The states included Arkansas, Colorado, Connecticut, Delaware, Florida, Georgia, Illinois, Indiana, Iowa, Kansas, Kentucky, Louisiana, Maryland, Massachusetts, Michigan, Minnesota, Mississippi, Missouri, Montana, Nebraska, New Hampshire, New Jersey, New York, North Carolina, North Dakota, Ohio, Oklahoma, Pennsylvania, South Carolina, South Dakota, Tennessee, Texas, Virginia, Washington, Wisconsin and Wyoming.

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