"I don't know yet." Jimie said, "After our vaccine was produced, the number of people infected significantly decreased. However, not long ago, more and more people became infected again. We have just studied it and found that there are some changes in the virus."
"Have you found out the reason?" Jacob asked.
"Not for the time being, but the virus' mutation broke out at a certain point. Most of the residents of several villages were infected. We found that there was something wrong with the water source."
"Let's go. Take me there to have a look." Jacob stood up and said.
"Okay, I'll arrange it now." Jimie nodded. He went out and arranged an off-road vehicle, on which there were several members of the peacekeeping force following them, and they headed north.
Half an hour later, they arrived at a village. Jacob got out of the car and went in with Jimie.