These findings demonstrate that the clinical features of AHC observed in this study were milder than those reported previously, in contrast to the high transmission rate during an epidemic. Changes in clinical features of AHC, such as a low incidence of subconjunctival haemorrhage and disappearance of neurological complications, might be due to biological transformation of EV70. It should be noted that EV70 is still an important aetiological agent of explosive epidemics of AHC.
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