Union Health Secretary Rajesh Bhushan said 20 per cent of India's adult population have received both doses of COVID-19 vaccine and 62 per cent have got at least one dose.
The ICMR has been permitted to use drones up to a height of 3,000 metre to deliver vaccines.
According to an ICMR study, 95 per cent of deaths take place within 25 days of a person testing COVID-19 positive.
The results of serosurvey the ICMR had released in July found Kerala lagging behind others in the case of acquired immunity.
The state Health Minister said that despite a spike in cases in recent times, the occupancy of ICU and ventilator facilities remains low.
The country has achieved the milestone of the last ten crore tests in only 55 days.
Kerala has the largest proportion of population that is still vulnerable and not yet exposed to the virus.
The Centre has advised all states and Union territories to conduct seroprevalence surveys in consultation with the ICMR to generate district-level data.
The survey showed 67.6% of adults were seropositive in India, while more than 62% of adults were unvaccinated.
The education department has taken a stand that it would decide on the matter only after getting official communication from the central government.