WordNet sense 1 (German bacteriologist who developed a diagnostic test for syphilis (1866-1925)):

Agust von Wassermann

WordNet sense 2 (a blood test to detect syphilis; a complement fixation test is used to detect antibodies to the syphilis organism treponema; a positive reaction indicates the presence of antibodies and therefore syphilis infection):

Wassermann test, Wasserman reaction