BENGALURU: The Centre’s advisory to states to increase the interval between the primary and second doses of Covishield vaccine to 12-16 weeks from the sooner 6-8 weeks has left many senior residents confused. Those who took the second dose after six weeks are actually involved about its efficacy.
(*4*) stated Sridhar MS, 61, from Bengaluru.
Dr T Jacob John, retired professor and head of scientific virology and microbiology at Christian Medical College, Vellore, stated there isabsolutely no drawback if the second dose of Covishield is delayed.
“The protection it offers after a four-week interval is nearly 100% against a severe form of the disease,” he defined. “But it is not 100% against mild and moderate Covid. If you increase the interval up to 12 weeks, the efficacy against mild to moderate disease increases.”
Dr John conceded no research has been performed to check efficacy past a 12-week window. (*1*) he stated. “If someone has missed the second dose of Covaxin, it can be taken within a year as well,” he stated.