Table 3.

Diagnosis of scrub typhus by acute-phase IgG or IgM IFA only^a

Diagnosis	IgG ≥ 400	IgM ≥ 400	IgG and IgM both ≥400
Scrub typhus	47	48	36
Co-infection	5	4	2

^aA total of 66 positive samples were identified based on titer of 400 for IgG or IgM or both as determined by IFA