What are the chances?

[PirateBrewer]

So stupid me brewed up a batch of AHS Agave Wit on Saturday night. I put it down in my basement to let it ferment and didn't check it out until today. Well, it turns out the stopper and airlock blew off the carboy. I have NO idea when this happened...it could have happened an hour after I put it in my basement (meaning being completely exposed for nearly 4 days) or it could have happened today. What are the chances this beer will end up being infected?

 

[edb23]

If it's fermenting that strong the co2 being produced is probably keeping everything else out of the carboy

 

[beninan]

slim. I would say its fine. most likely, there's a blanket of CO2 on top.
Just reinstall the airlock and let it finish and find out for yourself.

 

[PirateBrewer]

Yeah, I think it'll be all right but just wanted outside opinions. It certainly didn't look infected but I wanted to see if possibly leaving it uncovered for a few days might have had an impact. Thanks for the responses!