Table 1.

Selected epidemiological, clinical, and laboratory features of four Argentina patients with R. parkeri rickettsiosis

Feature	Patient 1	Patient 2	Patient 3	Patient 4
Age (years)/gender	47/male	57/female	47/male	28/male
Province of exposure	Buenos Aires	Córdoba	Córdoba	La Rioja
Month of exposure	November	December	November	November
IFA titer(s)*
R. rickettsii	< 32, 128	32	1,024	128, 512
R. parkeri	< 32, 512	256	1,024	256, 512

^*Acute- and convalescent-phase IgG antibody titers are represented as the reciprocal of the last serum dilution exhibiting a specific pattern of fluorescence when reacted with the antigen.