The world record so far is a 6 chain transmission among humans. It's very hard to spread. That's why no one is worried. The thing you are missing that no one i

The world record so far is a 6 chain transmission among humans. It's very hard to spread. That's why no one is worried. The thing you are missing that no one is saying out loud is that this time it is spreading as an STD, and there is only a finite amount of time between infectiousness and presentation of symptoms. It's not applicable to most people, especially in the west where we have very few daily intimate interactions with the people around us.