Complex sentence: The virus is excreted in the feces of the healthy carrier, this transmission route can be detected by Polymerase Chain Reaction or "PCR" of feces or by PCR testing of rectal samples.
Split into simpler sentences: The virus is excreted in the feces of the healthy carrier. This transmission route can be detected by Polymerase Chain Reaction or "PCR" of feces or by PCR testing of rectal samples.