Vaccines against Viral & Bacterial Diseases

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Viral vaccines contain either inactivated viruses or attenuated (alive but not capable of causing disease) viruses. Inactivated or killed viral vaccines contain viruses, which have lost their ability to replicate and in order for it to bring about a response it contains more antigen than live vaccines. Attenuated or live vaccines contain the live form of the virus. These viruses are not pathogenic but are able to induce an immune response.

Viral vaccines prevent or modify the severity of illness in the individual and interrupt or reduce the transmission of the pathogens to other susceptible people. Through these mechanisms, vaccines against smallpox, polio, measles and hepatitis B have had an enormous impact on world health over the last 50 years.