TABLE 1.

IFA, Western blot, and available PCR and culture results of the samples from human ehrlichiosis patients and their states of residence

Sample	IFA titer		Western immunoblotting				PCR (culture) result		State of residence or presumed tick exposure
	E. chaffeensis	HGE agent	Approximate molecular size(s) (kDa) of reacting antigen(s)		rP30	rP44	E. chaffeensis	HGE agent
			Purified E. chaffeensis	Purified HGE agent
1	5,120	320	40, 46, 55, 58, 110	42	+a	−	NAb	NA	NA
2	2,560	1,280	28, 47	30, 45, 72	+a	−	NA	NA	NA
3	5,120	2,560	26, 28, 34, 42, 52	47, 49, 55	+a	−	NA	NA	NA
4	1,280	640	30, 44, 47, 110	49, 55, 72	+a	−	NA	NA	NA
5	1,280	640	44, 55	45, 47, 72	+a	−	NA	NA	NA
6	2,560	1,280	27, 28, 55, 74	55	+a	−	NA	NA	NA
7	5,120	320	23, 26, 30, 45, 55, 58, 90		+a	−	NA	NA	NA
8	5,120	320	30, 40, 45, 55	72	+a	−	NA	NA	NA
9	1,280	640	45, 48, 58, 110	42, 47, 55	+a	−	+c	NA	NA
10	640	320	28, 45, 55		+a	−	+c	NA	NA
11	640	1,280	45, 58	49, 55	+	−	NA	NA	Arkansas
12	2,560	320	28, 40, 44		+	−	NA	NA	Missouri
13	5,120	320	44 58, 74, 90, 110		+	−	NA	NA	Missouri
14	640		28, 32, 45, 58, 110		+	−	NA	NA	Texas
15	160		30, 40, 58		+	−	+d	NA	Washington, D.C.
16	160		40, 55, 110		+	−	+(+)d	NA	Florida
17		160		47	−	+	NA	−e	New York
18		320		49	−	+	NA	+e	New York
19		160		44, 47, 49	−	+	NA	− (+)e	New York

^aData from reference (20). 

^bNA, not available. 

^cPerformed at MRL Reference Laboratory. 

^dPerformed at CDC. 

^ePerformed at New York Medical College.