A global immunization program has eliminated smallpox ​ — the lethal disease that claimed more lives than all the wars of the 20th century combined — ​ and a similar campaign has almost eradicated polio.
આજે આખી દુનિયાએ રસી વાપરીને પોલિયોને પણ લગભગ મિટાવી દીધો છે.