contagious

Then he gazed up at Penelope and croaked, “Highly contagious! Plague, perhaps?”

The admiral’s sense of adventure was as contagious as a bad pun, and Penelope was starting to feel the effects herself.

No one is immune to holiday fatigue, and it is contagious: One grumpy traveler can make the rest of his or her party miserable before the station wagon has left the driveway.

Measles is highly contagious, and a drop in childhood vaccination rates in Canada and in other countries has left many children unprotected from the disease.

A wave of the highly contagious respiratory syncytial virus is beginning to wash over the United States — sending greater numbers of babies and toddlers to the hospital, recent data show.