Table 2.

Surveys from the literature for SFG Rickettsia in Amblyomma americanum in locations east of the Mississippi

State	Number tested	Rickettsia rickettsii	Rickettsia montanensis	Rickettsia parkeri	Rickettsia amblyommatis	Reference
TN	655*	0	0.3	0	40	42
KY	108	NT	0	0	27.8	43
VA	1,969 (nymphs)	0	NT	0	55.9	50
	576 (adults)	0	NT	0	72.8
NC	459	0.2	0	2.1	90.9	51
VA	2,010–2,509†	0	0	0	26.9	44
	2,011–252†	0	0	0	54.9
GA	526	0	0.4	0.47	27.4	52
VA†,‡	225 (larvae)	NT	NT	NT	7§	53
	34 (nymphs)	NT	NT	NT	47
	81 (adults)	NT	NT	NT	42
FL	160*	0	0	0	33	54
FL	1,312†	0	0	0.16	29	55
NJ	1,858 (nymphs)	0.05	0	0.00	25	22
Mean‖	–	0.025 ± 0.12	0.08 ± 0.31	0.25 ± 1.24	44.05 ± 39.43	–

Unless otherwise noted, number tested refers to adults tested, and values for each Rickettsia species reflect % positive. We only included studies with a minimum of 100 ticks and excluded studies focusing on nonhuman host-associated ticks.

^*Nymphs and adults tested.

^†All life stages tested.

^‡Larvae tested in pools of 15 (infection prevalence assumes one positive tick per pool).

^§Prevalence in larvae not included in calculation of mean.

^‖Means ± 1.96 × SD (=95% CI).