Originally Posted by djr76
My question is do you think the beer has become infected do to the exposure of oxygen?
Oxygen wouldn't infect your beer. Your beer could become oxidized from exposure to oxygen, but that's not an infection. The concern when you blow the top off is any randomly floating particles that could possibly land in there.
You are 99% most likely fine on both cases. When your fermentation is that active, it is pushing out a ton of CO2 which will prevent oxygen from hitting the surface, and it will also keep anything airborn out by the same method.