#004 - 'The Thing' (1982) Ending Theory - Was Childs Infected?

The horror classic, The Thing (1982), is one of the crowning achievements of director John Carpenter's career, but the ending has had people arguing for decades. In a movie where anyone can be the monster, you can have a cut and dried finale. So how 'bout it? Was Childs infected after the arctic research station is destroyed? Could MacReady be infected? Both?