Telling the difference between the two isn’t always easy, but there are clues. The main symptom of a viral infection is usually watery diarrhea, free of blood or mucous; conversely, mucous and blood are more often seen in diarrhea caused by a bacterial infection. Stool samples and blood tests can be taken and analyzed to confirm which of the two types it is. If you have any questions or concerns regarding gastroenteritis, its causes, or treatment, contact Columbia Clinic Urgent Care today! We serve patients from Portland OR, PDX, Happy Valley OR, Tigard OR, Milwaukie OR, Cedar Hills OR, Cedar Mill OR, Lake Oswego OR, Oak Grove OR, Vancouver WA, Aloha OR, Minnehaha WA, Gladstone OR, Tualatin OR, West Linn OR, Fairview OR, Oregon City OR.