C185 Is there such a thing

In fact, Zhan Chen knew that he was suffering from smallpox. In the modern era, people who received a vaccine or received it once wouldn't be able to get it again.

But how to tell these people?

"I don't know if you've seen such a medical case. In one of the records, it said that there was once a pimple in Anlin, but it didn't have such a large range."

A doctor exclaimed, "I've seen it before