History

In the 18th century a method of avoiding………1….. was introduced to Britain from …2…….. where it had been used for centuries. Chinese doctors had noticed that people who had suffered a mild form of smallpox often …3………….. during later epidemics. They developed a method of …………4………which involved spreading matter from a smallpox scab onto an open cut on the skin. This gave people a …5……..dose of the disease and protected them from the full force of a severe attack.