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More than 10 percent of Americans have not returned to get their second COVID-19 vaccine shot.
The Centers for Disease Control and Prevention (CDC) reports that only 88 percent of people who received initial shot of the Pfizer-BioNTech or Moderna vaccine completed their series as of June 16, per CNN.
It is recommended that people get their second shot 21 days later for Pfizer and 28 days later for Moderna.
Of the remaining 12 percent, 11 have missed getting their second dose and 1.5 percent are within the 'allowable interval' to receive it - up to 42 days after their first dose.
While studies have found that people are safer with two doses of a COVID-19 vaccine instead of just one, recent research shows that many with only one shot still do have protection against the virus.
However, some experts worry that those who are not returning for their second shot will be left vulnerable to variants of the virus, especially with the Delta variant - a more contagious strain that originated in India - which is suspected to take over as the dominant strain in the U.S. in the coming weeks.
More than 10 percent of Americans are not returning to get their second dose of a COVID-19 vaccine, leaving them potentially vulnerable to the virus and its variants
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