TABLE 4.

Age dependency of the anti-LPS IgM response after the onset of salmonellosis^a

LPS ELISA	Value for age range
	<20 yr		21-40 yr		41-60 yr		>60 yr
	No. of positive sera/total no. of sera	Odds ratio	No. of positive sera/total no. of sera	Odds ratio	No. of positive sera/total no. of sera	Odds ratio	No. of positive sera/total no. of sera	Odds ratio
Serotype Enteritidis	12/13	3.3	27/30	2.2	65/79	1.6	17/31	1.0 (ref)
Serotype Typhimurium	9/13	1.1	30/37	1.1	42/63	0.88	28/34	1.0 (ref)

^aThe presented data are all from sera collected approximately 1 month after the onset of symptoms (medians, 21 days for the serotype Enteritidis patients and 27 days for the serotype Typhimurium patients). Sera from patients diagnosed with serotype Enteritidis infections were analyzed by the serotype Enteritidis LPS-based ELISA, and sera from patients diagnosed with serotype Typhimurium infections were analyzed by the serotype Typhimurium LPS-based ELISA.