How do we know the COVID-19 vaccines are safe?
Scientists look for safety issues during the testing phase and continue their monitoring as shots roll out around the world. So far, the only serious warning to emerge is a rare risk of severe allergic reactions.
Different types of COVID-19 vaccines have been authorized and it’s possible side effects will differ for each — although there’s more public data on the vaccines being rolled out in Western countries than elsewhere. Countries also vary in their vaccine standards, with some allowing the use of shots before final-stage testing involving large numbers of volunteers.
But in the U.S., Britain and European Union, regulators required any vaccine to be tested in tens of thousands of people before distribution. So far, the U.S. is using shots from Pfizer and Moderna, while Britain and Europe have cleared those plus the AstraZeneca vaccine.
FAUCI CAUTIONS AGAINST DINING OUT, EVEN WHEN VACCINATED
Those companies’ large studies found that common side effects were minor and typical of the immune system revving up: soreness in the arm, fever and flu-like symptoms including fatigue, chills and headache.
But since extremely rare problems might not turn up even in large tests, the vaccines still are being monitored…