The Kerala High Court on Tuesday asked the Centre whether the 84-day gap between two doses of Covishield was based on availability of the vaccine or its efficacy.

The query to the Union government came from Justice P B Suresh Kumar while hearing a plea by Kitex Garments Ltd seeking permission to administer the second dose of Covishield vaccine to its workers. The judge also said that if the efficacy of the vaccine was the reason for the gap, then he was “worried” as he was administered the second dose within four to six weeks of the first dose.