Table 1.

Pre- and post-exposure neutralizing antibody titer (in units mIU/mL) against measles. Measles cases are defined as at least a 4-fold increase in titer. Post-exposure titer is only among cases. Data published by Lee et al. (2000).

			Post-exposure titer
Pre-exposure titer	Number	Cases	0–49	50–99	100–399	400–999	1000+
0–49	22	16	0	1	6	3	6
50–99	18	9	0	0	2	5	2
100–399	44	11	0	0	0	1	10
400–999	31	4	0	0	0	0	4
1000+	69	2	0	0	0	0	2
Total	184	42	0	1	8	9	24