Hand, foot, and mouth disease affects which organs and what symptoms appear?

Patient's question:

What organs are affected by hand, foot, and mouth disease? What symptoms indicate that other organs have been affected? Is intravenous treatment necessary?
Hand, foot, and mouth disease has been present for three days, with blisters and red spots on the bones, mouth, and oral cavity, but no high fever has occurred. On the first day, I visited the outpatient clinic, and the doctor prescribed Ribavirin Granules, Xiaoyanban Granules, and Cefixime.
Previous treatment history and effectiveness: None.
Desired help: I would like to consult a professional doctor. Should I go to a designated hospital for hand, foot, and mouth disease for a follow-up visit in this case? Is intravenous treatment mandatory?

Doctor's answer:

Hand, foot, and mouth disease is an infectious disease in infants and young children caused by enteroviruses. The main symptoms include mouth pain, loss of appetite, low fever, and small blisters on the hands, feet, and mouth. Most cases are mild. In very few cases (especially those under 3 years old), the condition can worsen rapidly within 1 to 5 days, potentially leading to meningitis, encephalitis (with brainstem encephalitis being the most severe), encephalomyelitis, pulmonary edema, and circulatory disorders. In extremely rare cases, the condition can be life-threatening. Hand, foot, and mouth disease requires treatment at a hospital with infectious disease departments or a hospital with an infectious disease ward.

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