outbreak of febrile illness caused by coxsackievirus a4 in a nursery school in beijing, china. | coxsackievirus a4 (cv-a4) is classified as human enterovirus a according to its serotype. cv-a4, an etiological agent of hand, foot, and mouth disease, affects children worldwide and can circulate in closed environments such as schools and hospitals for long periods. | 2015 | 26084565 |