Don't Spread The Plague, or Anything Else You May Have.

The bottom line of this report is simple...

"Our study suggests that to prevent future spread hygiene is most important," said Prof Stenseth.
"It also suggests that if you're ill, you shouldn't come into contact with too many people. So if you're sick, stay at home."

That's something I have always done and always wished others would do.
It never ceases to amaze me how selfish other people are when they are ill, they go in to work showing all the symptoms of disease and infection and joke about giving it away for free.
These days I am much less tolerant of this, I now consider it tantamount to assault. Fortunately I am in a position where I can just walk away, not everyone in employment can do that.

"Black Death 'spread by humans not rats'"

Probably Human Rats