"contagious effect" is correct and usable in written English.
You can use this phrase to describe a situation in which a single event or idea spreads and influences other events or ideas. For example, "The new policy had a contagious effect, and similar policies were soon adopted in other offices."
But both her tactful socialization of the idea and its contagious effect were self-validating.
It will be useful if his recent comments on two themes, religion and community, have a contagious effect.
Similarly, the contagious effect of the region's financial turmoil has shown how vulnerable members are to their neighbours' policy mistakes.
"Everyone is wondering whether this will have a contagious effect on the industry," said Tim Ghriskey, a senior portfolio manager at the Dreyfus Corporation.
"He has a contagious effect". Four Spartans scored in double figures, debunking the theory that they are a one-man team.
Consider the contagious effect, the way the softish Nets have become, in a short time, more Reggie-like in their persona: sturdy, combative, unyielding.
"Given the political history of Africa, events in one country have had contagious effects elsewhere.
"We always overshoot the upside and, because of the same contagious effects, we overshoot the downside.
But it also means that we cannot insulate ourselves from the contagious effects of the financial crisis in the United States, and the sharp increase in world commodity prices.
Taxpayers and governments alike are tired of bailing out creditors for fear of the destructive contagious effects of failure – even as bailouts encourage excessive risk-taking.
To some degree, Mr. Rajgopal said, the study confirms other behavioral research showing the contagious effects of leaving bad behavior unchecked.
