Impact of national immunization schedule on vaccine preventable diseases: a hospital based study.

An analysis of vaccine preventable diseases (VPD) in two block years, i.e., 1972-1975 and 1986-1989 showed an overall decline in morbidity and mortality. Improvement in morbidity was most noticeable in typhoid fever followed by polio and tetanus. However, in tuberculosis and measles with compilations, there was a significant increase in admission rates 3.8 vs 4.4% and 1.8 vs 2.2%, respectively. Mortality in vaccine preventable diseases except polio has declined significantly.