The context of the following conversation is Kai worked in a laboratory where they tested vaccines on mice, and they ended up improving the health of the mice.:
Kai says We had success with our vaccination trial in the mice today..
The friend responds That's good news..
Kai responds It improves their health overall so I think we'll try to get higher level test subjects next..
The friend responds I hope it works on people..
Kai responds It'll be a while before we know but at least we know it has potential..
The friend responds Congrats on almost finding a cure!.