TABLE 2.

Nucleotide differences in the 16S rRNA genes of the Shasta snail-1 and Shasta snail-2 ehrlichiae and four strains of E. risticii (Illinois, SRC agent, Kentucky, Ohio 081)

Strain or pool	Nucleotide at positiona:
	36	76	77	90	92	97	131	309	619	828	956	971	1221	1231	1246
Illinois	G	G	G	C	T	C	G	A	G	A	T	G	C	C	G
SRC agentb	•	•	•	•	•	•	•	•	•	•	C	•	T	T	A
Shasta snail-1	A	•	•	•	•	•	•	G	•	•	C	•	T	T	A
Shasta snail-2	•	•	•	•	•	•	•	•	•	G	C	•	T	T	A
Kentuckyc	•	•	•	•	•	A	A	•	•	•	C	•	T	•	A
Ohio 081c	•	A	A	T	C	•	•	•	T	•	C	A	T	T	A

^aBullets indicate conserved positions relative to E. risticii Illinois, the type strain. 

^bEhrlichia from blood buffy-coat cells of a horse acutely ill with SRC (21). 

^cIsolate described by Wen et al. (42).