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Enterovirus infections are caused by many different viruses including coxsackievirus, echovirus, enterovirus, and poliovirus. They are responsible for causing illnesses in 10 to 30 million people each year in the United States, primarily in the summer and fall and they are most common among children. Infections are highly contagious and typically affect many people in a community, sometimes reaching epidemic proportions.
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Enteroviruses infect an estimated 50 million people each year in the US and possibly a billion or more worldwide. Approximately 75% of enterovirus infections occur in children under 15 years of age, and the occurrence rates are highest in children under 1 year of age. Transmission occurs orally, either via aerosol or ingestion of contaminated food. Approximately 50-80% of enterovirus infections are mild or asymptomatic; however, they can also develop into severe and life-threatening diseases. Serologic studies have distinguished over 70 human enterovirus serotypes associated with 26 different syndromes and diseases, including coronary heart disease, type 1 diabetes, hand-foot-and-mouth disease, polio, and meningitis. Traditionally, enteroviruses were classified into four separate species: coxsackie, echovirus, enterovirus, and poliovirus. However, due to large overlaps in their epidemiologic and clinical characteristics, their taxonomy has changed, and newly identified viruses are now numbered, starting with EV68. To date, the following enterovirus subtypes have been identified:
Subtype Diseases
Poliovirus 1-3 Paralysis, aseptic meningitis, encephalitis, poliomyelitis
Coxsackie A1-A24 Herpangina, hand-foot-mouth, common cold
Coxsackie B1-B6 Pleurodynia, aseptic meningitis, encephalitis, pericarditis, myocarditis
Echovirus 1-9, 11-31 Paralysis, aseptic meningitis, encephalitis
Numbered Enteroviruses Herpangina, hand-foot-and-mouth, conjunctivitis (EV70), aseptic meningitis (eg. EV71)
Enterovirus outbreaks are common in the summer and fall, though they can cause infections year-round in tropical parts of the world. Several serotypes have been responsible for large outbreaks including:
Diagnostic methods for enterovirus include virus isolation, nucleic acid testing (NAT), and serological tests such as ELISA, complement fixation (CF), and neutralization assays. In particular, IgM ELISAS have proven very useful in cases of meningitis when cerebral spinal fluid samples are not available. Also, the rapid serotype identification of enterovirus is important in differentiating non-poliovirus enterovirus pathogens from vaccine strain polioviruses that can be shed for some time after vaccination, especially in age groups in which oral poliovirus vaccines are usually administered.
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