ANSWER: 201
Explanation:
According to the health Ministry, these districts have been selected under the programme, keeping in view that nearly 50 percent of all un-vaccinated or partially vaccinated children are in these 201 districts. It said, of them 82 districts are concentrated in the four states of Uttar Pradesh, Bihar, Madhya Pradesh and Rajasthan. The immunisation programme aims at covering all children below two years of age who have either not been vaccinated or partially vaccinated against seven diseases which can be prevented through vaccines. The diseases are Diphtheria, Tetanus, Polio, Measles, Whooping Cough, Hepatitis B and Tuberculosis.