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-Eight weeks has left many senior residents confused. Those who took the second dose after six weeks are actually involved about its efficacy.
“We took the second dose in 6-8 weeks but the latest advisory suggesting an interval of 12-16 weeks has left us confused,” mentioned Sridhar MS, 61, from Bengaluru.
Dr T Jacob John, retired professor and head of medical virology and microbiology at Christian Medical College, Vellore, mentioned 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 examine has been performed to check efficacy past a 12-week window. “What is known so far with all vaccines is that even if you delay the second dose by a year, the first dose is still effective. Given the situation, a four-week interval is ideal. But if there is a problem with supply, is it better to delay it so more people get the first dose,” he mentioned. “If somebody has missed the second dose of Covaxin, it may be taken inside a 12 months as effectively,” he mentioned.