Dhaka, April 15 -- The unrelenting spread of measles in Bangladesh will take time to come under control despite ongoing vaccination efforts, Information and Broadcasting Advisor Zahed Ur Rahman has said.

Explaining the delay, he said immunity does not develop immediately after vaccination, particularly among children.

Speaking at a press briefing organised by the information ministry at the Secretariat on Wednesday, Zahed said the nationwide vaccination campaign began on Apr 5 and is continuing, but immediate improvement should not be expected.

"A section of children was previously outside vaccination coverage. This reflects a past failure. Even so, we cannot accept the tragic deaths of children under any circumstances," he said.

He a...