Covid-19' (NEGVAC) set up by the Centre to consider the issue of introducing the door-to-door vaccination drive.On Wednesday, Additional Solicitor General Anil Singh, appearing for the Centre, sought further time following which the court posted the matter for the next hearing on June 8.Singh told the HC that by July-end, the availability of vaccines, both Covishield and Covaxin, will increase."Currently, there are 90 lakh Covaxin doses available.