Pakistan, Nigeria and Indonesia will be among the biggest recipients of free Covid-19 vaccines before June -- more than 10 million doses each -- the Covax scheme announced Tuesday.Some 238.2 million doses will be distributed around the world by the end of May through the programme aimed at boosting access to coronavirus jabs in poorer nations.Though vaccination campaigns have gathered pace globally, the majority of injections have been administered in wealthier countries while many nations have yet to receive a single dose.The Covax scheme, aimed ensuring equitable access to Covid-19 vaccines, on Tuesday outlined plans to deliver to 142 countries and territories by May 31, in its first wave of distribution.The five biggest confirmed.