title: Letter: Nonspecific humoral response associated with secondary syphilis.
mesh_terms: D003937:Diagnosis, Differential; D005188:False Negative Reactions; D005189:False Positive Reactions; D006801:Humans; D007075:Immunoglobulin M / Q000032:analysis; D008297:Male; D008875:Middle Aged; D013587:Syphilis / Q000276:immunology*; D013588:Syphilis Serodiagnosis
chemical_list: D007075:Immunoglobulin M