Entervirus 71 is one of the most important infectious diseases in children and the important concern in public health. Since 1998, EV71 has become an endemic disease in Taiwan and caused hundreds of severe cases and dozens of fatal cases each year due to lack of EV71 vaccine. Family transmission study also showed that it is highly contagious among households as well as in daycares or kindergartens. Therefore, a rapid diagnosis is clinically necessary and can provide clinicians the rapid answers and make early treatment possible to reduce the complications and case-fatality rate. In addition, early diagnosis of the patients will alert parents and public health workers to prevent the contacts earlier and to limit the EV71 spread.