Antibiotics, vaccines, and aggressive public health campaigns had resulted in a string of victories over old epidemic diseases, e.g., pneumonia, polio, Whooping cough, small pox, dengue fever, yellow fever but, due to obvious reasons, many of the old diseases are reemerging globally. In addition, since last 20 years, the world has seen the global emergence of new diseases, e.g., AIDS, hantavirus pulmonary syndrome, hepatitis C and E, Ebola virus, lyme disease, cryptosporidiosis, and the deadly E. coli O157 : H7. Some of the most recent, dramatic examples of emerging (new diseases) and reemerging diseases are being given in respectively.
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