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Hmmm. Is it true that if you've had cowpox you wont get smallpox?
Hey boy! Would you like to help me with an experiment?
James Phipps is then infected with cow pox from Edward Jenner collecting pus from a 'pock' on a milkmaid with cowpox and spreading it on a scratch he made on James' arm.
James got cowpox but soon recovered.
Jenner then gave James smallpox using pus from a smallpox victim. James did not get smallpox.
Oh wow! The boy hasn't got smallpox. This must be because James' body has learned how to stop cowpox which is similar to smallpox.
Yay I'm alive!
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