title: Letter: No IgM in amniotic fluid.
mesh_terms: D000653:Amniotic Fluid / Q000276:immunology*; D005260:Female; D006801:Humans; D007075:Immunoglobulin M / Q000032:analysis*; D011247:Pregnancy; D012409:Rubella / Q000276:immunology*
chemical_list: D007075:Immunoglobulin M