vaccinations will be opened to all above 18 from 1 May.States can take help from agencies like the Defence Research and Development Organisation (DRDO) and the Council of Scientific and Industrial Research (CSIR) and similar agencies in the private sector to build field hospitals, the government said.The Centre today released a strategy guide to take India's Phase 3 vaccination drive forward.Along with Rajesh Bhushan, Dr RS Sharma, chairman of the empowered group on technology and data management on Covid-19, also chaired a high-level meeting to guide the States/UTs on effective implementation of the New Vaccination Strategy (Phase-3).Dr Sharma noted that the CoWIN platform has now stabilised and is working at scale flawlessly.