Serum Institute of India
 Serum Institute of India is a manufacturer of Immunobiological including vaccines in India. The company is managed by the Poonawalla group- fully owned by Cyrus Poonawalla. The company is the fifth biggest vaccinemaker by volume the top four being GlaxoSmithKline Sanofi-Aventis Merck and Novartis. Half the children in the world are immunized by vaccines made by the company which is the world's biggest maker of measles and DTP vaccines.