New Delhi: India's research and manufacturing will be critical to fighting COVID-19 especially for making vaccines on a large scale, billionaire philanthropist Bill Gates said on Monday.Addressing the Grand Challenges Annual Meeting 2020, Gates delved upon the difficulties in vaccine development and diagnostics of COVID-19.The American business magnate said India is "very inspiring" as it has made huge strides in improving the health of its people in the last two decades."And now, India's research and manufacturing will be critical to fighting COVID-19 especially when it comes to making vaccines at large scale," he said.Gates said scientists all over the world are involved in a particular 'grand challenge' -- ending the current pandemic.He.