She has 'infected' everyone 'with' her enthusiasm. [=her enthusiasm has made other people feel enthusiastic too]
All the computers in the office were 'infected' by/with the same virus.
The virus has 'infected' many computers.
(..) little chieftain. But the fel is born of death, must have a price. Like his father, a born leader. If Gul'dan can infect born as innocent as he. What chance do the rest of us have? This gate, who showed it to Gul'dan? (..)2016 Warcraft