Happiness can be just as contagious as misery.
Our built-in human system for mimicry explains why we humans can transfer our good and bad moods to each other - if we aren't careful!
Both hope and pessimism are deeply contagious. And no one is more infectious than a leader.
It is a fair, even-handed, noble adjustment of things, that while there is infection in disease and sorrow, there is nothing in the world so irresistibly contagious as laughter and good humour.
If an employee told you he had the flu, you'd send him home. If an employee told you he was feeling anxious, you'd probably tell him to get back to work. But the emotion is just as contagious as a flu virus.
The crowd may be influenced easily, largely because it is a crowd.
Sometimes pessimism or optimism gets popular, and it's contagious.
If you see one negative person a lot of people start to get negative, and that's not good for any time.
Sure there's contagion in the tears of friends.
If there is any form of contagion that is adaptive, it is the immediate response to the fear of others. If others are fearful, there may be good reason for you to be fearful too.