The material needed for stool screening is taken from a donor’s regular donations. Easy! COVID-19 screening is required for participating, and is scheduled for donors approximately every 2 weeks. The donor must be able to visit the Rebiotix facility at the regularly scheduled COVID-19 test date. The test is a nasopharyngeal swab. Blood screening is scheduled for donors approximately every 6 weeks. The donor must be able to visit the Rebiotix facility at the regularly scheduled blood screening date. A small amount of blood is drawn by a professional phlebotomist for screening purposes.