Hi
We encountered a strange event several times.
City at about 650 Population, Hospital, Medicals and so on working well.
Suddenly there are more than 70 Settlers sick (icon shows, no information message), running to their homes. After about less than one Minute later the message displays that they are already cured again and the workers go back to the workplace.
Rgds
Kevin
If a soldier gets a flu, he doesn’t care. He will pass it to 23 other folks in the fort. Then 1 by 1 they will start running to the doctor with pneumonia 
THis is a common occurance. It is a plague for all intents and purposes.
here is a thread dedicated to them 
The reason it seems so quick is that a minute is roughly a month in game
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