A big fire has broken out at a plant being built for the Serum Institute of India (SII), the world’s biggest vaccine maker, but it will not affect the production of coronavirus vaccines, a source close to the firm said. The company is also getting ready to produce a vaccine being developed by the United States company, Novavax Inc. Reports said the blaze was at a new plant under construction at the large facility. Television channels showed a huge cloud of grey smoke above the site in Pune in the western Indian state of Maharashtra on Thursday. The SII is manufacturing millions of doses of a vaccine developed by Oxford University and AstraZeneca for India and many other low- and middle-income countries. Pune’s fire office told.