A contagious disease, common among children, symptoms are rashes on skin, which has been eradicated from the whole world is?

Smallpox is the only human disease successfully eradicated globally through vaccination. The World Health Organization declared it eradicated in 1980 after an intensive worldwide immunization campaign. Polio is nearly eradicated but still exists in a few countries, while plague is an endemic bacterial disease and goitre results from iodine deficiency rather than infection.