A "warm" vaccine in the works: Most vaccines need to be transported and distributed between 2 degrees Celsius and 8 degrees celsius in the so-called cold chain. A heat-tolerant Covid-19 vaccine can be transported to remote villages for millions of doses without reliance on the cold chain. Such vaccines are rare, but a team of scientists at the Indian Institute of Science (IISc) is working on one for Covid-19. A group of researchers headed by Raghavan Varadarajan, a professor at IISc and

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