Infector

 is a strong, passive skill which can be used to instantly infect a human with two spores in succession. This is very useful early on to gather some teammates.

, for example, is often around the rear of the ship on her own. If you and a fellow Mush go in and you spike her thrice, she can't inform her teammates because she is on your team already! (It would be up to or  to check on her and see this.)

Even after you have been confirmed as a, you can still spike people twice, setting someone up for your teammates to get later. Even without a partner, you can single handedly convert a human over day change!

The limiting factor with this skill is usually your ability to produce the spores for it, so it combines well with skills that facilitate this like and.