The Calcutta Municipal Corporation has decided to administer second doses of Covid vaccines only on Wednesdays and Saturdays, modifying an earlier arrangement that kept three days in a week reserved for the second shot.

“We will administer only second doses on Wednesdays and Saturdays. First doses will be administered on Mondays, Tuesdays, Thursdays and Fridays,” said a deputy chief municipal health officer of the CMC.

CMC officials said Monday’s experience had prompted them to further tweak the vaccination schedule.

“We administered only the second dose yesterday. But at almost all CMC vaccination centres, the number of recipients were too few compared with the number of doses,” said an official.

The picture changed on Tuesday. At a health centre in Ward 82 (Chetla), only 41 people took second doses on Monday. On Tuesday, 419 people were given the first dose.

A vaccination centre at Chetla’a Ahindra Mancha administered 750 first doses till 5.30pm on Tuesday. The day before, only 110 people took the second dose.