Farshy C E, Cruce D D, Klein G C, Wilkinson H W, Feeley J C
Ann Intern Med. 1979 Apr;90(4):690. doi: 10.7326/0003-4819-90-4-690.
Differences in results of microagglutination tests for the Legionnaires' disease bacterium on untreated sera and sera treated with 2-mercaptoethanol suggest that, like other agglutination tests, the microagglutination test is heavily dependent on the presence of IgM antibody.