So far, 81% of India's adults have received at least one dose while 43% have had two doses. Vaccination for people under 18 has not yet begun.
"The priority is to fully immunise the adult population," said one of the sources. The sources declined to be named as the matter was still being discussed by policy makers.
"A big majority has been naturally infected, and for them two doses are enough. That's why we are seeing that even after recent festivals, cases are not rising." The source said that once most adults have had two vaccine doses, the government could make boosters optional.