New York, United States. 24th Aug, 2020. Flu shot are offered at CVS pharmacy on 3rd Avenue in New York on August 24, 2020. According to the Centers for Disease Control and Prevention (CDC), there are many different flu viruses and they are constantly changing. The composition of U.S. flu vaccines is reviewed annually and updated as needed to match circulating flu viruses. Flu vaccines protect against the three or four viruses (depending on the vaccine) that research suggests will be most common. (Photo by Samuel Rigelhaupt/Sipa USA) Credit: Sipa USA/Alamy Live News

- Image ID: 2CDRBD4

New York, United States. 24th Aug, 2020. Flu shot are offered at CVS pharmacy on 3rd Avenue in New York on August 24, 2020. According to the Centers for Disease Control and Prevention (CDC), there are many different flu viruses and they are constantly changing. The composition of U.S. flu vaccines is reviewed annually and updated as needed to match circulating flu viruses. Flu vaccines protect against the three or four viruses (depending on the vaccine) that research suggests will be most common. (Photo by Samuel Rigelhaupt/Sipa USA) Credit: Sipa USA/Alamy Live News

Sipa USA / Alamy Stock Photo

Image ID: 2CDRBD4

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