The year-long longitudinal cohort study started in January last year and continued till March this year. A total of 304 healthcare workers (HCWs) were included in the study.
Free doses are available at government hospitals only for people above 60 years, health care workers and front-line workers.
With the government offering precautionary doses free of cost at the government hospitals, there has been reported a spike in the number of booster doses.
The Delhi government had written to the Union Health Ministry, saying that the uptake of precaution doses at private COVID vaccination centres was not very promising.