NEET BIOLOGY

Detailed explanation-1: -Thanks to the success of vaccination, smallpox was eradicated, and no cases of naturally occurring smallpox have happened since 1977. The last natural outbreak of smallpox in the United States occurred in 1949.

Detailed explanation-2: -Smallpox Virus In 1980, the World Health Assembly declared smallpox eradicated (eliminated), and no cases of naturally occurring smallpox have happened since.

Detailed explanation-3: -The last naturally occurring case of smallpox was reported in 1977. In 1980, the World Health Organization declared that smallpox had been eradicated. Currently, there is no evidence of naturally occurring smallpox transmission anywhere in the world.

Detailed explanation-4: -So far, the world has eradicated two diseases-smallpox and rinderpest.

Detailed explanation-5: -Almost two centuries after Jenner hoped that vaccination could annihilate smallpox, the 33rd World Health Assembly declared the world free of this disease on May 8, 1980. Many people consider smallpox eradication to be the biggest achievement in international public health.