Scientists are concerned that vaccines may be less effective against the Indian variant, which could become dominant in the UK by June. The double mutation Covid-19 variant is thought to be behind a sudden surge in cases in India which has overwhelmed hospitals. A total of 182 cases have been detected in the UK, 162 in the five weeks up to 16 April, forcing Boris Johnson to postpone his trip to India and the government to add India to its travel ‘red list’. Viruses regularly mutate but most are insignificant, however, some mutations can make the virus more infectious, deadly or resistant to vaccines. The Indian virus may be one of those - especially because two mutations have come together to help infect cells and evade the immune system.