So I brewed up my long planned Baltic porter, dropped it in the keezer to ferment at 58F and promptly left town the next day for Florida for five days. Came home and found the airlock top sitting on the floor of the keezer- I suspect the fermentation activity and foam blew it off but there was no significant mess to suggest all that much of an overflow of fermentation activity. Anyways, the carboy sat open to the air of the keezer x 5 days at the most. There is an internal small fan in the keezer circulating air. The SG has dropped from 1.085 to 1.050, it tastes fine, and no horrendous odor. I replaced the airlock and fermentation continues, albeit, slowly. What are the chances this is infected? How do I tell? Is this worth following thru to the end of my planned 3-6 months aging. I was really excited on this beer and pretty pissed this happened especially since I genuinely considered a blow off tube but then decided against it.