[DoughtyOne]

All it takes is a few careless people, and it's over.

If someone gets around a lot, and they aren't feeling good, they
can infect a lot of people who in turn infect a lot of others.

Folks need to be on their toes and self-quarantine if there's any doubt.

[yesthatjallen]

All it takes is a few careless people, and it's over.

Even with our best efforts, one Typhoid Mary can render everything we do useless.

Just think of the Chinese woman who left China to have dinner in France and laughed about it.