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A healthy attitude is contagious but don't wait to catch it from others. Be a carrier.

It's your life. Live it with people who are alive. It tends to be contagious.

Everyday interactions we have with other people are definitely contagious, in terms of happiness.

Confidence is contagious. So is lack of confidence.

I was bringing my attitude as a regular person 'cause this is my attitude.

Nothing is so contagious as example; and we never do any great good or evil which does not produce its like.

Nothing is so contagious as enthusiasm.

Aggression unopposed becomes a contagious disease.

There is no passion so contagious as that of fear.