If you read how the virus writes then you understand why it the Jewish community so hard.
The probability clause.. if 100 have it.. not every single person they encounter will get it.
If you are one person what you encounter somebody who has it you may not get it But if you encounter five people have it.. your chances are much higher
I think just how the community is so interwind. Schools, stores, celebrations, Purim between Megila reading, shalach Manos , seuda etc.