Only 56% of healthcare workers and less than 50% of frontline workers have been fully vaccinated so far and the coverage is worse in many states, the Centre said on Thursday while expressing concern over the poor coverage almost five months after the vaccination drive began on January 16. Only 56% of healthcare workers and less than 50% of frontline workers have been fully vaccinated so far and the coverage is worse in many states, the Centre said on Thursday while expressing concern over the poor coverage almost five months after the vaccination drive began on January 16.