Our expert says:
There are no blood results that are specific for a viral infection unless you test for antibodies - a full blood count can give you an indication but is not specific for viral infection. Ulcerative colitis is a chronic disease and you will get flare ups from time to time, there is not much you can do to prevent it except use the medicine as prescribed. Are you with a specialist gastroenterologist?
See also http://digestive.niddk.nih.gov/ddiseases/pubs/colitis/
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