Signs of complicated EV71 infections include the following: Myoclonic jerks, particularly in sleep Urinary retention Ataxia, weakness, or any focal neurological signs Hypertension and/or bradycardia Severe, unexplained or persistent tachycardia or poor [health.nsw.gov.au]

"Eczema coxsackium" and unusual cutaneous findings in an enterovirus outbreak. Pediatrics. 2013 Jul. 132(1):e149-57. [Medline]. Begier EM, Oberste MS, Landry ML, et al. [emedicine.medscape.com]

Usually, several days after birth, the neonate suddenly develops a syndrome resembling sepsis with fever, lethargy, disseminated intravascular coagulation, bleeding, and multiple organ (including heart) failure. [msdmanuals.com]

[…] be heard when the doctor examines the chest with a stethoscope Hand, foot, and mouth disease ( HFMD ): small nodules and blisters that are tender and appear gray that occur on the hands, feet, and in the oral cavity Encephalitis : Symptoms range from lethargy [medicinenet.com]

coma, and movement disorders early in the course [6] Encephalitis – Manifestations range from lethargy, drowsiness, and personality change to seizures, paresis, coma, motor seizures, hemichorea, and acute cerebellar ataxia [7] Herpangina – Punctate [emedicine.medscape.com]