TABLE 1.

Distribution of 57 human sera based on their reactivities to the different ehrlichial antigens by Western immunoblotting

Group	No. of sera	Reactivity with agenta
		Purified E. chaffeensis antigen		rP28	Purified E. canis antigen		rP30	E. chaffeensis IFA titer
		44–110 kDa	28 kDa		44–110 kDa	30 kDa		Range	Geometric mean
A	15	+	+	+	+	+	+	1:40–1:1,280	1:640
B	6	+	+	−	+	+	+	1:40–1:1,280	1:320
C	3	+	+	−	+	−	+	1:40–1:640	1:80
D	2	+	−	−	+	+	+	1:40–1:640	1:160
E	1	+	−	−	+	−	+	1:320	1:320
F	4	+	−	−	−	−	+	1:80–1:320	1:160
G	2	−	−	−	−	+	+	1:320–1:640	1:320
H	1	−	+	−	−	−	+	1:20	1:20
I	3	+	−	−	+	−	−	1:80–1:1,280	1:640
J	20	−	−	−	−	−	−	<1:20	<1:20
Total	57

^a+, reaction; −, no reaction.