I got bit just after sundown of day 10. I finally found (after a lot of searching) a first aid kit just after 10am on day 16. At no point did my bite develop into an infection, or naturally heal. At that point I realised: If I had a bite I used to try to cauterize it and treat it with antibiotics, or disinfect it, depending on my medical equipment. I haven’t actually let a deep bite naturally turn into an infection for quite some time. Maybe some version broke that functionality? I definitely know that the infection used to develop within 6 hours, and I was lucky if it didn’t advance after 12 hours, so 132 hours seems unusually long with that in mind.
I haven’t used the first aid kit yet, so I still have the save game with the bitten character if anyone is interested.