A: Severe reactions, such as an allergic response, are rare, and typically occur within 15 minutes of receiving the shot, which is why patients are generally being observed for 15 minutes after being vaccinated, Prickett said. People, however, should seek medical attention if they’re experiencing high fevers after a shot, altered mental states, gastrointestinal issues with dehydration, or if they pass out, she said.
How do I schedule a second COVID-19 vaccine shot? Why hasn’t my health system contacted me yet? Common Illinois vaccine questions answered.
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