Table 2.

Changes of antibody status during the short-term period.

Positive Results, n (%)
MAA (n = 62)		ELISA (n = 62)
		1st Examination		2nd Examination
Seroconversion	24 (39)	IgM negative	12	All IgM positive, but 1 case decreased value
(negative→ ≥1:40)		IgM equivocal	4
		IgM positive	8
Increased titer	27 (44)	IgM equivocal	2	All IgM positive (26 cases increases and 1 case showed same value)
		IgM positive	25
Both high titer of ≥1:640	11 (18)	IgM positive	11	5 cases increase, 4 cases decrease, 2 cases same value

The mean duration from the first examination to the second examination was 3.2 ± 0.9 days. Abbreviations: MAA, microparticle hemagglutinin assay; ELISA, enzyme-linked immunosorbent assay.