Figure 2.

Joinpoint regression analysis of the positive rates by age of the patient. (a) EV; (b) JEV; (c) HSV; (d) MuV. EV, Enterovirus; JEV, Japanese encephalitis virus; HSV, Herpes simplex virus; MuV, Mumps virus. Red points indicate the mean positive rate of patients in terms of age and the colored curves indicate fitted patterns by age groups. The annual percent change (APC) value of each fitted curves is given for each virus. *indicates that the APC is statistically significantly different from zero at P<0.05.