title: Technical difficulties in interpreting virus-specific IgM antibodies in the presence of rheumatoid factor.
mesh_terms: D000293:Adolescent; D000328:Adult; D000956:Antigens, Viral / Q000032:analysis; D005260:Female; D005455:Fluorescent Antibody Technique; D006801:Humans; D007074:Immunoglobulin G / Q000032:analysis; D007136:Immunoglobulins / Q000032:analysis*; D008297:Male; D012217:Rheumatoid Factor; D014780:Viruses / Q000276:immunology*
chemical_list: D000956:Antigens, Viral; D007074:Immunoglobulin G; D007136:Immunoglobulins; D012217:Rheumatoid Factor