Indians older than 18 can register themselves for vaccination against Covid-19 from 4 pm today, the central government has said. A tweet from the official handle of Aarogya Setu, the central government's mobile application for contact-tracing and dissemination of medical advisories, read: "Registration for 18 plus to begin on http://cowin.gov.in, Aarogya Setu App & UMANG App at 4 PM on 28th April. Appointments at State Govt centers & Private centers depending on how many vaccination centers are ready on 1st May for Vaccination of 18 plus."