Table 1.

Serological results from three participants with suspected recent pertussis prior to the booster immunization

Subject no.	Assay result before and after immunization
	Serion PT-IgG (FDA-U/ml)		PRN-IgG (IU/ml)		Pertusscan FHA-IgG (% cutoff)		OPA (titer)		IgG binding (AU/ml)
	Before	After	Before	After	Before	After	Before	After	Before	After
3	81	131	70.2	1,496.5	165	462	64	2,048	231	3,237
5	166	168	54.2	237.4	162	282	64	256	133	465
83	103	113	318.0	450.3	552	581	512	512	3,166	3,141