Any medical professionals or microbiologists on here?

Did some research and I’m fairly certain that my apartment seems to be a Serratia Marcescens hotspot. More or less just want to know if it’s something that I should actually be concerned about.

Back story: I first noticed some pink funk in my yogurt quite a few months ago. Tossed it, whatever. Then I noticed that there was pink stuff building up in my humidifier. Began regularly cleaning it with Clorox wipes. Then I noticed it showing up in my sinks and now I just noticed it in my toilet (which seems to have some other bacterial stuff going on with it, so I’ve already been treating it with bleach). I’m a pretty clean person (actually have OCD and regularly wipe everything down with bleach), so I highly doubt it’s a cleanliness factor here. Anywho, so I assumed that it was something in the water, as it’s only showing up in areas that are moist. Google turned this out, which seems to point to the bacteria being abundant and airborne. The information from the water companies is saying don’t worry about it, but the hospitals and microbiologists are saying otherwise. I can’t seem to get a clear answer as to how people actually become infected by it. I noticed it said that the infection can cause respiratory issues which raises a red flag because I’ve had a couple colds since I moved into this place less than a year ago, which is unusual for me. Obviously those could be brought on by a plethora of reasons, though.

TLDR; Does anyone here know how the bacteria infects people?