COVID survivors had more side effects after shot

In a study posted online Monday, researchers found that people who had previously been infected with COVID-19 reported fatigue, headache, chills, fever, and muscle and joint pain after the first shot more frequently than those who had never been infected. COVID survivors also had far higher antibody levels after both the first and second doses of the vaccine.

Based on these results, the researchers say, people who have had COVID-19 may need only one shot.