Table 1.

Titration results with different antigens of Rickettsia spp.

Highest titers in immunofluorescence antibody assay
Sample		Antigen
		R. rickettsii	R. parkeri	R. amblyommatis	R. rhipicephali	R. bellii	R. felis
Human	Case 1, S1	8,192	4,096	4,096	2,048	2,048	256
	Case 1, S2	16,384*	4,096	4,096	4,096	2,048	64
Dog	Pet of case 1	16,384*	4,096	2,048	2,048	128	256
	Pet of cases 2 and 3	16,384	8,192	4,096	4,096	1,024	512

S = sample.

* Probable antigen involved in homologous reaction.