You can spread the infection to anyone else who uses them.

While at the market it spread the infection to other animals.

"Don't spring this on anybody until you've already spread the infection for a few hours."

You are buying into it and then spreading the infection.

It is also able to spread the infection and persist.

Contact with an infected individual may also spread the infection.

When the local health board canceled public meetings, people still met each other and spread the infection.

It contains living bacteria, and so can spread the infection.

This phase can rapidly spread the infection over a wide area.

You may still be able to spread the infection.