"We thought that was interesting because there was a lot of research coming out about sex-specific differences and COVID-19 illness severity but less about responsiveness and side effects to vaccines," Andersen says.
"It just got us thinking more about personalized health and whether certain characteristics could be playing a role here," Andersen says.
The researchers found a significant correlation between stress and the perception of vaccine side effects, indicating that psychological factors can influence physical health outcomes.
Concerns about potential side effects were a major barrier for some people to getting the vaccine at all, yet little research had been done on what could make someone more vulnerable.
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