2009 H1N1 Influenza — The Pandemic Continues

Since the emergence of this virus in spring 2009, the number of infections has remained uncharacteristically high, presaging a bad winter for influenza.

The first cases of influenza A (H1N1) in the U.S. were identified in April 2009. By August 30, at least 1 million cases had occurred in this country; 9079 influenza-related hospitalizations and 593 deaths had been reported to the CDC. New cases appeared during the summer months, when influenza activity is usually rare, with incidence approaching winter levels in August in six states and Puerto Rico. Although the proportion of deaths attributed to influenza or pneumonia did not exceed epidemic thresholds for ≥2 consecutive weeks at any time during the summer, the number of pediatric deaths (47) was elevated.

The CDC and the WHO reported that since May 3, most influenza viruses identified from patients in the U.S. have been 2009 pandemic influ…

Reviewing Author

Stephen G. Baum, MD

Disclosures

Consultant/Advisory BoardClinical Infectious Diseases

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Editorial BoardsMedical Letter

Stephen G. Baum, MD

Disclosures

Consultant/Advisory BoardClinical Infectious Diseases

RoyaltiesUpToDate

Editorial BoardsMedical Letter

2009 H1N1 Influenza — The Pandemic Continues

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Reviewing Author