I Have Not Been Anywhere Near Mosquitos And Have Not

I have not been anywhere near mosquitos and have not been bitten, but I tested positive IgM for "ross river virus" an arbo virus. I also have night sweats, and got pneumonia for no reason and have bouts of histamine intolerance. Normal bloodwork, no HIV. I got retested and again the IgM raised but the IgG equivocal? It must be a mistake. I have none of the symptoms of Ross River arbovirus. And the tests for the IgM were one month apart? What else can I have?