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The article discusses the influenza cases in the U.S. during October 3, 2010-February 5, 2011. It claims that during the period, around 140 World Health Organization (WHO) and National Respiratory and Enteric Virus Surveillance System (NREVSS) have tested respiratory specimens for influenza viruses, of which 19.5% were tested positive. Seventy-three percent of the positive cases were influenza A viruses and 27% were influenza B viruses.

This article presents an update on influenza activity in the U.S. from October 3 to December 11, 2010. Data showed low influenza activity in most regions of the country. World Health Organization (WHO) and National Respiratory and Enteric Virus Surveillance System collaborating laboratories reported 2,807 cases of influenza, with 57 percent were identified as cases of influenza A viruses.

The article offers updates on the influenza endemic activity during the 2009-2010 influenza season in the U.S. It notes that the detected second wave of the H1N1 influenza A which peaked in late-October 2009 resulted in higher pediatric mortality and higher hospitalization rates in children and young adults in various U.S. states. It also accounts the highest proportion of outpatient visits to healthcare providers and clinics for influenza-like illness (ILI) in the U.S. during the 2009-2010 influenza season.

The article discusses influenza activity in the U.S. from October 3 to December 11, 2010. A total of 2,807 respiratory specimens were found to be positive for influenza viruses. Most of the cases have been reported from Region 4, the region where influenza B viruses have been reported more frequently. During the 2010-2011 season, the Centers for Disease Control and Prevention (CDC) has antigenically characterized 89 influenza viruses collected by laboratories. For 6.9% of all deaths reported to the Cities Mortality Reporting System, pneumonia and influenza was blamed as an underlying cause of death.