The disease can be fatal to animals and is extremely contagious, the doctor said.

Easy sentimentality is nowhere to be found here; in its place: the kind of organized chaos that leads to sheer, extremely contagious high spirits.

There is no vaccine nor medical treatment against this extremely contagious disease.

They are extremely contagious, and fewer than twenty virus particles can cause an infection.

Cold and flu can be extremely contagious and are usually more common at certain times of the year.

Norovirus is extremely contagious and can be lethal to the elderly, very young or very sick patients.

I always find yawning extremely contagious; even seeing the word in print will do it.

Instead, Toxoplasma has evolved to be extremely contagious, but not very harmful.

Until the rash has developed crusts, a person is extremely contagious.

The answer was ominous: a resurgence of measles, an extremely contagious disease.