'Rare autoimmune hepatitis in people vaccinated with Covishield a concern' The study presented two such cases where the Covishield vaccine showed a temporal correlation and hence, most likely acted as a trigger for the development of AIH. Share Via Email | A+A A- A health worker prepares to administer Covid vaccine to a beneficiary in Delhi. (Photo | Shekhar Yadav, EPS) NEW DELHI: Even though a majority of adverse reactions of Covid vaccines have been mild events like fever and myalgia so far, a recent study claims that Covishield vaccine has more serious side-effects in the form of thromboembolic events and autoimmune hepatitis (AIH) in individuals.