infectious
adjective /ɪnˈfekʃəs/
  /ɪnˈfekʃəs/
 - an infectious disease can be passed easily from one person to another, especially through air or water- Flu is highly infectious.
- (figurative) infectious laughter
 Oxford Collocations Dictionaryverbs- be
 - highly
- very
- potentially
- …
 
- [not usually before noun] if a person or an animal is infectious, they have a disease that can be spread to others- I'm still infectious.
 Oxford Collocations Dictionaryverbs- be
 - highly
- very
- potentially
- …
 compare contagious
Word Originmid 16th cent.: from infection + -ous.