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Influenza, or the flu, is a contagious respiratory illness caused by the influenza virus that infects the nose, throat and/or lungs. Symptoms include fever, cough, sore throat, runny nose, body aches, headache and fatigue. The virus spreads via droplets when an infected person coughs, sneezes or talks, or, less commonly, by touching a contaminated surface, then touching one's face. According to the U.S. Centers for Disease Control and Prevention, an average of 3-11% of the U.S. population gets sick with the flu each year, and 4,900-52,000 people die. Getting vaccinated for the flu each year is the best way to prevent infection. 

COVID-19 and the Flu

Comparison of influenza virus, which causes the flu, with SARS-CoV-2, which causes COVID-19.
Comparison of influenza virus, which causes the flu, with SARS-CoV-2, which causes COVID-19.
Source: American Society for 棉花糖直播

Weekly percentage of positive tests (antigen and PCR) for COVID-19, influenza virus and RSV from Nov. 2021 through Nov. 2023.
Weekly percentage of positive tests (antigen and PCR) for COVID-19, influenza virus and RSV from Nov. 2021 through Nov. 2023.
Source: CDC

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Inadequate Flu Vaccination Rates

Annual vaccination is the best way to protect oneself against the flu. Although the seasonal flu vaccine is widely available, less than 50% of the total U.S. population got vaccinated for the latest season on record. This is a public health concern. Improved funding and education is needed to facilitate widespread coverage.


Influenza vaccination rates for children 6 mos. to 17 years of age by U.S. state for the 2020-2021 flu season.
Influenza vaccination rates for children 6 mos. to 17 years of age by U.S. state for the 2020-2021 flu season.
Source: American Society for 棉花糖直播
Influenza vaccination rates for adults 18 years old and older by U.S. state for the 2020-2021 flu season.
Influenza vaccination rates for adults 18 years old and older by U.S. state for the 2020-2021 flu season.
Source: American Society for 棉花糖直播

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