TABLE 1.

Rickettsial strains studied

Rickettsial strain	Source	Geographic origin	Pathogenicity (disease)	Standard strain no.a
R. rickettsii Sheila Smith	Human	Montana	Rocky Mountain spotted fever	ATCC VR149
R. sibirica 246	Dermacentor nuttalli	Former USSR	North Asian tick typhus	ATCC VR151
R. conorii Malish	Human	South Africa	Mediterranean spotted fever	ATCC VR613
R. conorii Moroccan	Unknown	Morocco	Mediterranean spotted fever	ATCC VR141
R. conorii Astrakhan	Human	Russia	Astrakhan fever
R. conorii Israel ISTT CDC1	Human	Israel	Israeli spotted fever
R. conorii Indian (Indian tick typhus)	Rhipicephalus sanguineus	Indian	Indian tick typhus
Thai tick typhus rickettsia TT-118	Ixodes or Rhipicephatus spp.	Thailand	Spotted fever
R. australis Philips	Human	Australia	Queensland tick typhus
R. akari MK (Kaplan)	Human	New York State	Rickettsialpox	ATCC VR148
R. montanensis tick strain	Dermacentor andersoni	Montana		ATCC VR611
R. rhipicephali 3-7-6	Rhipicephalus sanguineus	Mississippi
R. parkeri Maculatum 20	Amblyomma maculatum	Mississippi
R. africae Z9-Hu	Human	Zimbabwe	African tick-bite fever
R. helvetica C9P9	Ixodes ricinus	Switzerland
R. massiliae Mtu 1	Rhipicephalus turanicus	France		ATCC VR1375
“R. mongolotimonae” HA-91	Hyalomma asiaticum kozlovi	China	Spotted fever
Bar 29	Rhipicephalus sanguineus	Spain
R. slovaca 13-B	Dermacentor marginatus	Slovakia	Tick-borne lymphadenopathy
R. honei RB	Human	Australia	Flinders Island spotted fever
R. bellii 369L42-1	Dermacentor andersion	Ohio
R. felis Marseille	Ctenocephalides felis	United States	Flea-borne spotted fever
R. japonica YH	Human	Japan	Japanese spotted fever	ATCC VR1363
R. aeschlimannii MC16	Hyalomma marginatum	Morocco
Strain S	Rhipicephalus sanguineus	Former USSR
R. typhi Wilmington	Human	North Carolina	Murine typhus	ATCC VR144
R. canadensis 2678	Haemophysalis leporispalustris	Canada		ATCC VR610
R. prowazekii Breinl	Human	Poland	Epidemic typhus	ATCC VR142

^aATCC, American Type Culture Collection.