Table 2.

Results of IFA tests during 3-year follow-up.

Antibody titer (IFA)
		20 days*	2 mo	5 mo	12 mo	16 mo	20 mo	24 mo	29 mo	32 mo	36 mo
Phase I	IgM	3,200	1,600	1,600	1,600	3,200	200	400	400	200	400
	IgG	3,200	25,600	6,400	3,200	1,600	3,200	3,200	3,200	3,200	6,400
Phase II	IgM	800	200	100	100	200	50	<50	<50	<50	<50
	IgG	3,200	25,600	25,600	12,800	12,800	12,800	12,800	6,400	6,400	12,800

*Days/months after hospitalization.