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Table 2. Serological results from all human Pacific Coast tick fever case patients, California, 2008–2014.

Case^*	Onset	Jurisdiction	Age (years)	SFG PCR Result (day collected post onset)	^#Days serum collected post onset	Serology Results^‡
Case^*	Onset	Jurisdiction	Age (years)	SFG PCR Result (day collected post onset)	^#Days serum collected post onset	R rickettsii IgG	R typhi IgG
1	July 2008	Lake Co.	80	R. philipii (13)^†	6	ND	NT
1	July 2008	Lake Co.	80	R. philipii (13)^†	27	1:2048	NT
2	July 2011	Lake Co.	6	R. philipii (6)^†	3	ND	ND
2	July 2011	Lake Co.	6	R. philipii (6)^†	7	ND	ND
3	July 2011	Lake Co.	17	R. philipii (4)^†	4	ND	ND
4	Aug 2011	Contra Costa Co.	11	R. philipii (5)^†	3	ND	ND
5	Aug 2011	Lake Co.	5	R. philipii (5)^†	6	ND	ND
5	Aug 2011	Lake Co.	5	R. philipii (5)^†	>30	1:128	ND
6	Sept 2011	Santa Clara Co.	52	R. philipii (14)^†	18	>1:1024	1:128
6	Sept 2011	Santa Clara Co.	52	R. philipii (14)^†	>30	1:256	NT
7	July 2012	Orange Co.	14	R. philipii (9)^†^#	7	>1:128	ND
8	Aug 2012	Contra Costa Co.	12	R. philipii (11)^†	11	>1:256	1:64
9	Aug 2012	Monterey Co.	10	R. phillipii (13)^†^#	13	ND	ND
9	Aug 2012	Monterey Co.	10	R. phillipii (13)^†^#	>30	>1:1024	NT
10	Aug 2012	Contra Costa Co.	3	R. philipii (9)^#^§	8	ND	ND
10	Aug 2012	Contra Costa Co.	3	R. philipii (9)^#^§	18	>1:256	ND
11	Aug 2013	SF Co./Lake Co.	60	R. philipii (7)^#	7	ND	ND
11	Aug 2013	SF Co./Lake Co.	60	R. philipii (7)^#	19	>1:1024	ND
12	Aug 2013	SF Co./Lake Co.	62	R. philipii (7)^#	7	ND	ND
12	Aug 2013	SF Co./Lake Co.	62	R. philipii (7)^#	19	>1:1024	1:128
13	Aug 2013	Monterey Co.	57	R. philipii (7)^#^§	11	1:1000	1:100
13	Aug 2013	Monterey Co.	57	R. philipii (7)^#^§	>30	1:10000	1:100
14	May 2014	Lake Co.	74	R. philipii (19)^†^#	19	ND	NT

* Cases 1–4 reported previously. Shapiro et al, 2010, Johnston et al, 2013. Cases 1–3 & 8 were confirmed at CDC.

^† eschar,

^# swab,

^§ scab

^‡ ND Not Detected (Titer < 1:64); NT Not Tested