Since the “virus” is written to be platform independent, it COULD infect a Linux or Mac computer, but since you need SUDO or the admin password to perform installations on those respective platforms, the incidence is very low if non-existent.
This is a police department. I’ve yet to consult or work for a government agency that uses anything but Windows.
Yup. I allow sudo on my desktop, but make sure to require authentication. You can allow sudo to be passwordless, but I don't think it's a good idea.