The Child Rights and You (CRY) sample survey found that though the scenario had improved in the past few years, still 40 per cent of slum children were yet to be brought under the immunisation cover.
The CRY works for the underprivileged children and for the protection of child rights.
The study report said, "Immunisation being one of the most critical components for children's survival in the first six years, vaccination status in the slums of Kolkata falls short of expectation."
The sample survey was conducted in 18 slums of Mumbai, Bangalore, Chennai, New Delhi and Kolkata.
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"There is also a slight gender imbalance evident in the collected data with 61.2 per cent boys within one to three years age-group being fully vaccinated, while in the case of girls, it is about 56.5 per cent," the study revealed.
Delhi fares much worse than Kolkata in this regard, with less than one-third of the children fully vaccinated (about 31 per cent) under the age of three years, CRY CEO Puja Marwaha said.
"But more than 45 per cent of parents reported that they do not get regular and pro-active feedback from the centres," it said.