Yeah, it's pretty common. Just giving your cat a bath at home can do it if you get unlucky and they're already fighting somthing. It just requires a lot of caution, especially if their health is already iffy from other issues. It's usually started by a virus but can worsen easily.
Don't worry, it's completely treatable with more antibiotics (yes, dosing them is SO FUN) if it's the bacteria-related kind which is most common. Just need to be warm, dry and quiet. Plus medicine.