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In page Coxsackie A virus:

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The Coxsackie A Virus is a highly contagious virus that commonly causes the mild hand, foot, and mouth disease but complications may lead to more serious diseases that can affect the heart, lungs, muscles, and more.[citation needed] The modes of transmission of the Coxsackie virus is primarily through contact between people, respiratory droplets (fluid from coughing and sneezing), and contaminated surfaces.[1] All age groups can become infected with the Coxsackie virus, however it occurs most frequently in young children under the age of 10 and in who have a weakened immune system.[1]