Washington, DC (AP)  As COVID-19 vaccinations roll out, health authorities are keeping close watch for any unexpected side effects. Doctors already knew to be on the lookout for severe allergic reactions like an Alaska health worker suffered after receiving the Pfizer vaccine Tuesday. She was treated promptly and has recovered, a reminder to follow U.S. advice to hang around after the injection just in case of such reactions. More common are flu-like reactions as the immune system revs up. But the government is tracking how recipients fare in several ways, including checkups-by-text in the days after a shot.