заразан 用英语:

Enthusiasm is contagious.

cold sores are at their most contagious when they burst (rupture)

Colds are contagious.

I have chicken pox and it's probably contagious, so you'd better not come near me.

A contagious disease descended on the town.

contagious disease

Influenza, measles, pox and chicken-pox are infectious and contagious diseases.

The Ebola virus is deadly and highly contagious.

Laughter is contagious. It's hard not to laught when someone else is!

Her condition could also prove to be contagious," said the doctor.

A contagious disease is one that you can get if you touch someone who has it. Her excitement was contagious.

Definition if an illness is contagious, it can spread from person to person through physical contact. You can also say that a feeling or attitude is contagious if you think it is spreading through a group of people

The Ebola virus is deadly and highly contagious. A highly contagious strain of bird flu has been discovered at a poultry farm in Germany.

I have found that silent videos of yawning people trigger contagious yawns in about 55 per cent of observers

Cholera is extremely contagious, hence the quarantine.