New Delhi: The latest health ministry data released on Monday has shown that India's vaccination campaign has slowed despite amassing record stockpiles of vaccine.
The findings come at a time authorities are maintaining a wider-than-usual gap between doses in a strategy that has boosted coverage.
As per the health ministry data, domestic production of the AstraZeneca vaccine, which accounts for nearly 90% of administered doses, has more than tripled since May, when a supply shortage prompted India to double the period between doses to between 12 and 16 weeks.
That gap, exceeding the 8 to 12 weeks recommended by the World Health Organization, has allowed India to give at least one vaccine dose to 74% of its 944 million adults, with just 30% getting the full complement of two.
The report comes amid World Bank Group President David Malpass hailing union finance minister Nirmala Sitharaman on Sunday for India's successful Covid-19 vaccination campaign.
Meanwhile, over the last few days, daily stocks of all COVID-19 vaccines have exceeded 100 million doses, the health ministry figures show, for states and federally controlled territories taken together.
In contrast, daily vaccinations have dropped to an average of 5 million doses this month and even less in the past week, off a daily peak of 25 million last month.
The ministry said it followed recommendations from a group of experts in making any changes to dosage, arrived at by weighing up "scientific and empirical" evidence.
"NTAGI is actively considering the matter of dose interval between Covishield doses," its spokesperson told Reuters, referring to the ministry's National Technical Advisory Group on Immunisation (NTAGI).
However, vaccine supply alone should not determine the gap, said Chandrakant Lahariya, a physician and epidemiologist in New Delhi.
"There is no scientific rationale for reducing the gap," he added. "In fact, retaining this gap has the possibility of giving stronger protection and longer-lasting immunity."
Government officials have said they are trying to encourage more of those who are still unvaccinated to get inoculated.
A 12-week gap was more logical and scientific for vaccinations drives such as those in India, where some studies have shown many people already had antibodies against COVID-19, Lahariya said.