Source:http://linkedlifedata.com/resource/umls/id/C0018909
MSH: Agents that cause agglutination of red blood cells. They include antibodies, blood group antigens, lectins, autoimmune factors, bacterial, viral, or parasitic blood agglutinins, etc.,CSP: group of agents that cause agglutination of red blood cells; they include antibodies, blood group antigens, lectins, autoimmune factors, and bacterial, viral, or parasitic blood agglutinins.