| predictors of optional immunization uptake in an urban south indian population. | in tamil nadu, india, bacille calmette-guérin, diphtheria-tetanus-pertussis, oral poliomyelitis, hepatitis b, and measles vaccines are part of the routine immunization schedule and are available free from government health centers. all other vaccines are optional and available in the private sector at a cost to families. this study assesses immunization rates of routine and optional vaccines and examines parental attitudes toward vaccines in pallavapuram, tamil nadu. | 2014 | 24736005 |