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Quick Answer. Hand, foot and mouth disease in adults is caused by transmission from a person infected with the Coxsackievirus, according to Mayo Clinic. The virus is transmitted by personal contact such as exposure to nasal secretions, saliva, fluid from blisters, throat discharge or stool of an infected individual. Keep Learning.
The most common cause of hand-foot-and-mouth disease is infection with the coxsackievirus A16. The coxsackievirus belongs to a group of viruses called nonpolio enteroviruses. Other types of enteroviruses sometimes cause hand-foot-and-mouth disease. Oral ingestion is the main source of coxsackievirus infection and hand-foot-and-mouth disease. The illness spreads by person-to-person contact with an infected person's: 1  Nasal secretions or throat discharge. 2  Saliva. 3  Fluid from blisters. 4  Stool.