Unformatted text preview: eradication of the smallpox in the 1970s proves to be one of its most impressive global targets and thus its success prevented several millions of deaths. Moreover, the incidence of many other infectious diseases namely diphtheria, tetanus, poliomyelitis, measles, mumps, rubella, meningitis etc have experienced a drastic decrease owing to extensive vaccination programmes as it reduces the risk that non-immunised persons encounter the disease. Furthermore, vaccination provides herd immunity by ensuring the protection of a whole community from pathogens as it reduces the risk that non-immunised persons encounter the disease....
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- Fall '08
- Infectious Disease, Edward Jenner