Two months later he inoculated the boy with smallpox and the disease did not develop.
He gave a young boy the cowpox virus to protect him from smallpox.Six weeks later, he scratched smallpox into the boy's skin.The boy did not get sick from smallpox.
He gave a young boy the cowpox virus to protect him from smallpox.Six weeks later, he scratched smallpox into the boy's skin.The boy did not get sick from smallpox.
これをもっとわかりやすくしてください: Two months later he inoculated the boy with smallpox and the disease did not develop. 出力: