Actor Shreyas Talpade, who suffered heart attack last year, said he won't negate the theory that it might be related to COVID-19 vaccine's side effects. "It can be COVID-19 or the vaccine...but it's associated (with my condition)," said Shreyas, adding, "We genuinely don't know what we've taken inside our bodies." Recently, AstraZeneca admitted that Covishield can cause rare side effect.