COURTESY BY: https://www.dawn.com/ A fire broke out on Thursday at India’s Serum Institute, the world’s largest maker of vaccines, but a company source said production of drugs to prevent coronavirus was not affected. The Serum Institute is producing millions of doses of the Covishield coronavirus vaccine, developed by AstraZeneca and Oxford University, for India and many other countries. Local TV channels showed thick clouds of grey smoke billowing from the sprawling site in Pune, in western India. “It is not going to affect production of the Covid-19 vaccine,” a source…