USA : The US Food and Drug Administration plans to release guidance on Tuesday outlining its conditions for approving a vaccine for the coronavirus, the Wall Street Journal reported, citing a summary of the guidance.The agency would require drugmakers to show "clearly demonstrated" proof of a vaccine's safety and effectiveness through a clinical study, and at least 50% more effectiveness than a placebo, the report https://www.wsj.com/articles/fda-to-issue-guidance-on-covid-19-vaccine-approval-11593516090 said.There is currently no US approved treatment or vaccine for the respiratory illness that has claimed over 126,100 lives in the country, according to a Reuters tally.More than 100 vaccines are being tested worldwide against the virus,.