King James Version
Then the priest shall come and look, and, behold, if the plague be spread in the house, it is a fretting leprosy in the house: it is unclean.English Standard Version
then the priest shall go and look. And if the disease has spread in the house, it is a persistent leprous disease in the house; it is unclean.New International Version
the priest is to go and examine it and, if the mildew has spread in the house, it is a destructive mildew; the house is unclean.