Wed, 3rd Feb 2021 14:06 (Adding details) GENEVA/LONDON, Feb 3 (Reuters) - India's Serum Institute will supply 1.1 billion doses of COVID-19 vaccines developed by AstraZeneca and Novavax to the COVAX vaccine scheme as part of a new long-term deal, the head of the U.N. Children's Fund said on Wednesday. UNICEF chief Henrietta Fore said the shots would be delivered over a number of years at the cost of about $3 per dose for low- and middle-income countries. They would be produced by Serum under a technology transfer agreement, she said in a briefing. The deal is on top of the goal of distributing 2 billion