File Photo NEW DELHI: Taking up the suo moto case on Covid-19 that caused former Chief Justice of India Sharad Bobde some embarrassment, the Supreme Court on Tuesday frowned at the Centre for allowing manufacturers to charge different vaccine prices and asked it to invoke the Patent Act to regulate them. It regretted that the Centre, which has the authority to regulate prices in the health sector, was watching a national crisis from the sidelines like a silent spectator. The Bench, headed by Dr Justice D Y Chandrachud, further asked the Centre to clarify the basis and the rationale for pricing of Covid-19 vaccines