'Unfounded and without basis': Harsh Vardhan on Chhattisgarh CM's concerns on Covaxin Chhattisgarh CM had raised two primary concerns regarding Covaxin -- inhibitions on incomplete trials and absence of "expiration date". Dr Vardhan says vaccine approved after due evaluation of pre-clinical and clinical trial data and that expiry date is mentioned on its label BusinessToday.In | February 12, 2021 | Updated 09:48 IST Union health minister Harsh Vardhan Union health minister Harsh Vardhan has written to Chhattisgarh health minister TS Singh Deo, who earlier went public with his government's concerns regarding Bharat Biotech's Covid-19 vaccine, Covaxin. Vardhan said Deo's concerns regarding Covaxin are completely "unfounded" and "without basis".