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test that uses whole organisms to find serum antibodies.
A direct agglutination test (DAT) is any test that uses whole organisms as a means of looking for serumantibodies. The abbreviation, DAT, is most frequently used for the serological test for visceral leishmaniasis.
References
Sundar S, Singh RK, Maurya R, et al. (2006). "Serological diagnosis of Indian visceral leishmaniasis: direct agglutination test versus rK39 strip test". Trans R Soc Trop Med Hyg. 100 (6): 533–7. doi:10.1016/j.trstmh.2005.08.018. PMID16325874.