The percentage of people who failed to get the second dose of Pfizer or Moderna COVID-19 vaccines is growing, according to recent CDC data. Some five million people, or almost 8% of people who got the first vaccine dose, missed getting the second.
In mid-March, 3% of people were overdue for their second dose.
People who missed getting their second vaccine dose provided several explanations. Some wanted to avoid adverse events, which are more common after the second dose. Others believed a single dose offered sufficient protection.
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