Good news is that there are germ free humidifiers out there. Although they can't promise 100% germ free, they can at least kill 99% of them so they should be safe enough for everyone in the building.
I know a few humidifier brands out there, but I go with the Honeywell brand for the germ free type.

Honeywell UV Germ Free Warm Mist Humidifier 1 ea
