[False positive reactions to the fluorescence test (FTA-ABS) in skin disease patients]

False positive reactions to the fluorescence test (FTA-ABS) were found in a group of dermatological patients compared to another group, made up of healthy subjects and blood-donors. Reactivity to FTA-ABS test was particularly evident in patients suffering from Herpes simplex genitalis, allergic diseases and collagenoses. Practical and theoretical aspects of this finding are discussed.