India is struggling with the second wave of Coronavirus. Vaccination is the biggest weapon to fight the deadly virus. India has formally approved three coronavirus vaccines, Covishield, Sputnik and Covaxin as it prepares for one of the world's biggest inoculation drive. But only Covishield has been approved by the World Health Organization. In such a situation, if a country makes a vaccine certificate mandatory for its journey, then only those who are vaccinated with Covishield will be allowed. Watch this video.