coronavirus vaccine candidates.Britain will buy potential Covid-19 vaccines from US drugmakers Johnson & Johnson and Novavax Inc, the companies confirmed on Friday, August 14, bringing the total number of deals by the UK government to six as the race for shots heats up.Johnson & Johnson said its Janssen Pharmaceutica unit will supply the UK Government with its candidate known as Ad26.COV2.S with an initial sale of 30million doses on a not-for-profit basis for emergency pandemic use.The advance purchase agreement will also provide an option for an additional purchase of up to a 22million doses, it said.In a separate statement, Novavax said the UK would buy 60million doses of its coronavirus vaccine candidate, NVX-CoV2373, for a phase 3.