False positive Kahn reactions; loss of titer on storage of serum in ice box.
D005189:False Positive Reactions; D006801:Humans; D007053:Ice; D044967:Serum / Q000378:metabolism*; D013587:Syphilis; D013588:Syphilis Serodiagnosis
D007053:Ice
KAHN REACTION; SERUM/storage; SYPHILIS/serodiagnosis