EBV: Infectious mononucleosis is caused by the epstein-barr virus. Testing is complicated, and depending upon what method of testing was employed and the timing of the tests it is possible that the test was falsely negative, but that would be unusual. There are many infections that simulate infectious mono and you should clearly be tested for hiv. Good luck.
Answered 12/9/2013
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Yes: The standard serum tests for mono rely on antibodies created in response to the disease. In kids as many as 50% or more are serum negative at clinical diagnosis. A blood count can suggest it and specialized testing can be positive earlier, but common tests may take time to turn positive.
Answered 1/29/2017
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