ACE and hepatitis A virus infection: On further testing, the patient had a nonreactive rapid plasma reagent, Quantiferon gold test, HIV rapid screen, hepatitis panel, Monospot test and Lyme western blot, HLA-B27, anti-cardiolipin antibody, antinuclear antibodies, double-strand DNA, Smith, RNP antibodies, and angiotensin converting enzyme (ACE).