Table 3. Specificity and cross-reactivity of IgM anti-EV71 in control subjects.

Ctrl Subjects	No. tested	No. positive	Specificity (%)(95%CI)
Enterovirus infected children	167	19	88.6 (82.8–93.0)
CA16	153	19	87.6 (81.3–92.4)
Other enteroviruses	12	0	100 (73.5–100)
Other Children	2035	19	99.1 (98.6–99.4)
Other infectious diseases	128	0	100 (97.2–100)
Healthy children	1907	19	2 99.0 (98.5–99.4)
Healthy adults	807	1	99.9 (99.3–100)
Rheumatoid factor (+)	20	0	100 (83.2–100)