British Prime Minister Boris Johnson's India visit - he is to be the chief guest at the Republic Day parade in Delhi next month - may not take place because of concerns over the rapidly-spreading mutated version of the novel coronavirus in that country, Dr Chaand Nagpaul, the Chair of the Council of the British Medical Association, told NDTV Tuesday. He said that while it was still too early for the British government to decide on Mr Johnson's visit, the trip "may not be possible, particularly if this level of infection and spread continues".