21 January 2021 - 12:43 By Reuters A fire has broken out at a plant being built for the Serum Institute of India (SII), the world's biggest vaccine maker. File photo. Image: REUTERS/Amit Dave 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 production of coronavirus vaccines, a source close to the firm said. SII is manufacturing a vaccine developed by Oxford University and AstraZeneca for India and many other low- and middle-income countries. The company is also getting ready to produce a vaccine being developed by the US company Novavax Inc.