Norovirus vs. Cyclosporiasis The two illnesses are easy to confuse, but they behave differently. Both norovirus and cyclosporiasis cause infections through the fecal-to-oral route and can cause gastrointestinal symptoms including diarrhea, nausea, and vomiting. However, norovirus is caused by a virus that spreads directly from person to person. Its symptoms develop quickly, cause more severe […]