Table 2. Testing results performed at the Armed Forces Research Institute of Medical Sciences.

	IIPa	IFAb		ELISAc
IgM (+)	14	15		14
IgG (+)	24	24		24
IgM (+) + IgG (+)	14	15		14
Total samples tested	28	28		28
PCRe and agarose gel electrophoresis positive results:			2 of 4

^aIndirect immunoperoxidase test (positive if titer was ≥1:400) (15).
^b Indirect immunofluorescent antibody test (positive if titer was ≥1:50) (15).
^cEnzyme-linked immunosorbent assay (positive if PanBio units >11) (15).
^dPositive immunoglobulin (Ig) M plus IgG results indicate active Orientia tsustugamushi infection. IgG without IgM indicates the persistence of IgG after a primary infection but with no active infection. The absence of both IgG and IgM indicates no exposure or a very early stage of infection (15).
^ePolymerase chain reaction for O. tsustugamushi DNA (13).