The mRNA vaccines by Pfizer and Moderna contain genetic instructions for our cells to make the spike protein of the SARS-CoV-2, which the virus uses to infect and enter the human cells.
With the delta variant, a study by British researchers found people were well protected when they got both doses of either the AstraZeneca or Pfizer-BioNTech vaccines.
The vaccination drive, with focus on people over the age of 45 years and mothers with children under five years, began at 6 AM in more than 2,000 locations in all 13 districts of the State.
The chief minister said there are around 650 cases of the black fungus in Delhi government hospitals but there is a shortage of drugs used to treat the disease.
In a statement, the ministry said the allocation of supplies to states and union territories is decided on the consumption pattern, population and vaccine wastage.
Sputnik V was registered in India under the emergency use authorization procedure on April 12, and vaccination against coronavirus with the Russian vaccine started on May 14.
The Chief Minister gave a set of directions to the officials including resolving the confusion over vaccine availability, oxygen supply in districts and ICU beds, according to an official release.