Sanofi Aventis is acquiring the 80% stake that Merieux Alliance held in Indian vaccine company Shantha Biotech. The Hyderabad-based 90mn euro (Rs 620 crore) turnover company makes vaccines and its flagship product, a hepatitis-B vaccine Shanvac-B brought it fame. The company says this is India’s first WHO-Geneva pre-qualified vaccine. It also makes other vaccines including those used in inoculation of infants.