Vaccines have historically been considered to be the most cost-effective method for preventing communicable diseases. It was a vaccine that enabled global eradication of the dreaded disease smallpox. Mass immunization of children forms the anchor of the strategy of the World Health Organization (WHO) to attain "health for all" status by the year 2000. Vaccinology is undergoing a dimensional change with the advances that have taken place in immunology and genetic engineering. Vaccines that confer short or inadequate immunity or that have side effects are being replaced by better vaccines. New vaccines are being developed for a variety of maladies. Monoclonal antibodies and T cell clones have been employed to delineate the immunodeterminants on microbes, an approach elegantly complemented by computer graphics and molecular imaging techniques. Possibilities have opened for obtaining hitherto scarce antigens of parasites by the DNA recombinant route. Better appreciation of the idiotypic network has aroused research on anti idiotypic vaccines. Solid-phase synthesis of peptides is leading to an array of synthetic vaccines, an approach that is expected to attain its full potential once the sequences activating suppressor cells are discovered and the rules for presentation of antigens to T and B cells are better worked out. A new breed of vaccines is on the horizon that seeks to control fertility. Originally conceived to intercept a step in the reproductive process, they are conceptual models for developing approaches to regulate the body's internal processes."

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Narsapur Municipality was formed as a third grade municipality in the year 26/9/1956. Narsapur town is located on the bank of the placid waters of the river Vasista Godavari. The Narsapur town which is bounded by Krishna and East Godavari Districts and the Bay of Bengal. Narsapur Municipality area is about 11.32 sq.km. About 45.06 KM roads were constructed in the entire Narsapur town. Out of which, 23.197 KM cement road was laid. All the important roads are electrified in Narsapur town. Major roads in Narsapur town are equipped with 250 Watts mercury lights. In Narsapur town, there is 11 lakh gallons of drinking water consumption everyday. This drinking water is being supplied through various sources. About 350 taps were constructed for the public availability. About 272 have been working in Narsapur municipality. As per census of India 2001, Narsapur had a population of 58,508. Males constitute 49% of population and females 51% Narsapur has an average literacy rate of 75%, higher than the National average of 59.5%, Male literacy is 78% and female literacy 71%. In Narsapur, 11% of population is under 6 years of age.Dutch people landed in Narsapur in 1626.