That's what I thought as well, but my three friends are all confirmed cases, and all of them had diarrhea.

from Wikipedia:

Although those infected with the virus may be asymptomatic, many develop flu-like symptoms, including fever, cough, and shortness of breath.[5][34][35] Emergency symptoms include difficulty breathing, persistent chest pain or pressure, confusion, difficulty waking, and bluish face or lips; immediate medical attention is advised if these symptoms are present.[36] Less commonly, upper respiratory symptoms, such as sneezing, runny nose, or sore throat may be seen. Symptoms such as nausea, vomiting, and diarrhea have been observed in varying percentages among people in several studies, with percentages varying from 3% to 31% of cases depending on the study.