His mood was so lighthearted that it proved contagious.

The attitude proved contagious; it infected musicians and audiences alike.

And on Tuesday, because they really were having a good time, it proved contagious in the extreme.

And I believe my enthusiasm might just prove contagious.

Miss Liu's behavior proved contagious, and at one point 69 delegates voted against the composition of a congress working committee.

Such a shock might prove contagious to other Latin American countries.

As the months passed, the bribery proved contagious.

Colleagues stopped talking to me, afraid no doubt that being on the wrong side of the new Director might prove contagious.

And he understood humans well enough to know it could prove contagious.

His vision proved contagious, and when Wilson sailed to Europe after the war, more people acclaimed him than any politician, before or since.