NEW DELHI - India has administered 1 billion doses of COVID-19 vaccine, officials said Thursday, passing a milestone for the South Asian country where the delta variant fueled its first crushing surge earlier this year.Ībout 75% of India's total eligible adult population have received at least one dose, while around 30% are fully immunized. India reached a milestone of administering a total of one billion doses against COVID-19. A woman reacts as a health worker inoculates her during a vaccination drive against coronavirus inside a school in New Delhi Wednesday.