Green light for Covaxin likely in 4-6 weeks: WHO expert A WHO pre-qualification, or Emergency Use Listing, is necessary for a vaccine manufacturer to supply vaccines to global entities such as COVAX or even internationally. Share Via Email | A+A A- A health worker shows the vials fo Covaxin dose, at a vaccination centre in Kolkata. (Photo | PTI) Express News Service BENGALURU: The World Health Organisation (WHO) is likely to take a decision on including Bharat Biotech’s Covaxin in its list of vaccines approved for emergency use, in four to six weeks, the world body’s Chief Scientist Dr Soumya Swaminathan has said. A WHO pre-qualification, or Emergency Use Listing, is necessary for a vaccine manufacturer to supply vaccines to global entities such as COVAX or even internationally.