Persons in the 18-45 age group eligible for anti-Covid vaccines from May 1 will need to mandatorily register online on the Co-Win platform and seek an appointment to get vaccinated as walk-ins will not be permissible, at least in the beginning of the new inoculation drive. Registration can be done from April 28. Walk-in facility, which got a good response in the 60-plus and 45-plus groups, is not being provided as the government expects a big jump in the number of vaccinations in phase 3 of the drive at a time when supplies are limited, official sources said. The measure is also expected to prevent crowding at vaccination centres. “Phase 3 means a large number of people and it cannot be implemented without planning, otherwise it will result in chaos. Online registration will help vaccination centres plan sessions in advance, manage crowds as well as supply of vaccines,” a senior official told TOI. While India administered over 14 crore doses of Covid-19 vaccines till Saturday 8pm, daily vaccinations are on a decline for nearly three weeks now. On Saturday, 24.22 lakh doses were given till 8pm. Apart from fear of infection amid the current surge, vaccines supplies have been reported to be erratic. So far, vaccination numbers were largely driven by walk-in beneficiaries. Of the total 12.21 crore registrations till Saturday, over 68% were by walk-ins and merely 11.6% were registered prior vaccination. Apart from these two categories, 2.43 crore health and frontline workers have also been registered by governments and their data pre-populated into the Co-Win system.