Manufacturing to supply of Covid-19 vaccine Covaxin involves four months of lag time depending on technology and regulatory approvals, Bharat Biotech said on Friday.

"The timeline for manufacturing, testing and release for a batch of Covaxin is approximately 120 days, depending on the technology framework and regulatory guidelines to be met. Thus, production batches of Covaxin that were initiated during March this year will be ready for supply only during the month of June," the vaccine maker said in a press release.