The Union Health Ministry has written to all states and UTs highlighting the need to significantly enhance the pace of COVID-19 vaccinations, noting that a large number of healthcare and frontline workers still remain to be covered. In a letter addressed to chief secretaries of all states and UTs, Union Health Secretary Rajesh Bhushan said the number of days of vaccination in a week should also be increased to a minimum of four days per week at the earliest to speed up the process of vaccination and gear up system to take up the vaccination of the 50+ population.