```
Chen Yu had no other choice after he got a basic understanding of the situation here.
The small mountain village had been completely sealed off, and some of the people who were cured couldn't wait to leave after ensuring they didn't have any abnormal symptoms, which resulted in fewer and fewer people remaining.
But, solutions to plague problems like this had been found decades ago, so how come this small mountain village couldn't solve it after seven or eight years?
Chen Yu didn't think too much about it and simply used the basic medical equipment available to conduct a sampling survey of the villagers.
He discovered that these residents had many kinds of plague antibodies in their bodies!
Moreover, the plague affecting them was constantly changing.
In other words, for the past seven or eight years, it was essentially a battle between the antibodies and the mutating plague.
