While public health experts say that Covid-19 cases will increase in winters, they, however, stressed that there is no need to get another vaccine shot as the potential to cause severe illness from the latest variant of coronavirus is less than the previous variants. "Our best information is that the current Coronavirus vaccines, even those based on the ancestral strain such as those administered in India, should continue to work on JN.1. The disease severity associated with the sub variant JN.1 is expected to be comparable to the other circulating variants, not worse," said Gautam Menon, professor of physics and biology at Ashoka University.