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For more information about Avian Influenza (H7N9), please click here: Avian Influenza (Bird Flu)
Influenza, or flu, is a respiratory infection caused by a variety of flu viruses. The "flu" is a common catch-all term used for a variety of illnesses, but it correctly applies only to the upper respiratory disease caused by the influenza virus.
Estimates are that between 15% and 40% of the population will develop illness from influenza every year. An average of about 36,000 people per year in the United States die from influenza, and 114,000 per year have to be admitted to the hospital as a result of influenza infection. Anyone can get the flu (even healthy people), and serious problems from influenza can happen at any age. People age 65 years and older, people of any age with chronic medical conditions, and very young children are more likely to get complications from influenza.
For the most current information about influenza in Florida, please see Florida's weekly surveillance report, the Florida Flu Review, included below under the Influenza Surveillance section on this page.
Week 49, 2013 Florida Flu Review Surveillance Summary
- Most Florida counties reported mild influenza activity. In week 49 nineteen counties reported increasing influenza activity.
- Emergency department (ED) and urgent care center (UCC) ILI visits have increased overall in recent weeks and the statewide percent of ED visits for ILI is at typical levels for this time of year.
- In week 49, ED and UCC visits decreased in all regions.
- In Florida, the most common influenza subtype detected at the Bureau of Public Health Laboratories (BPHL) in recent weeks has been influenza A (2009 H1N1).
- In week 49, 16 of 54 specimens submitted for influenza testing at BPHL tested PCR positive for influenza. Eleven tested PCR positive for influenza A (2009 H1N1), four tested PCR positive for influenza A unspecified and one tested PCR positive for influenza B. All of these are seasonal strains of influenza.
- Nationally (including Florida), almost all circulating influenza is a good match for the vaccine.
- No influenza or ILI outbreaks (epidemiologically-linked cases of influenza in a single setting) were reported in week 49.
- No pediatric influenza-associated deaths were reported in week 47. One pediatric influenza-associated death has been reported in the 2013-2014 season.
- The preliminary estimated number of Florida deaths due to pneumonia or influenza in week 48 is lower than the seasonal baseline, based on previous years’ data. Estimated deaths due to pneumonia and influenza are identified using preliminary death certificate data.
- Because of moderate influenza activity in some regions of the state, Florida reported regional influenza activity to CDC in week 49. This activity level represents the geographic spread of influenza in Florida.