TABLE 2.

Comparative titers of IgG to selected SFG rickettsiae in sera of hamsters inoculated with R. monacensis IrR/Munich^T-infected host cells^a

Antigen	Tick cells (IRE11)b	Mammalian cells (Vero)c	Control serumd
Rickettsia monacensis IrR/MunichT	1:16,384/1:16,384	1:16,384/1:16,384	1:4
Rickettsia peacockii DaE100R	1:256/1:512	1:256/1:512	1:1
Rickettsia strain MOAa	1:256/1:512	1:128/1:512	1:1
Rickettsia rickettsii Hlp#2	1:128/1:256	1:128/1:256	1:4
Rickettsia helvetica C9P9	1:128/1:128	1:64/1:512	1:1

^aIntraperitoneal inoculation of 1 × 10⁶ infected cells per hamster.

^bSera from two hamsters, 67 days postinoculation.

^cSera from two hamsters, 50 days postinoculation.

^dNegative control hamster serum.