Fern Mete
Edward Jenner was the first person to develop a smallpox vaccine using the milder but still protective cowpox virus in 1798 . However, the practice of immunization dates back a great deal further. Variolation was first introduced to Europe in the 18th century, but it was used in non-Western cultures as early as 1000 B.C. Variolation involves blowing dried smallpox scabs into the nostrils of a healthy person to inoculate them with the infectious material from an infected person's "pox." People who had been inoculated would typically contract a mild form of the disease but would recover and develop immunity to smallpox Only 2% of people who were variolated died from smallpox, compared to a natural death rate of 14% . However, there were risks associated with this method; some people did pass away from variolation, and because it caused real infections, people who were inoculated could spread the disease.
इस लेख का हिस्सा
English 
Spanish 
Chinese 
Russian 
German 
French 
Japanese 
Portuguese 
Telugu 