Echoviren

Echoviruses, or Echoviren in some languages, are a group of non-polio enteroviruses within the genus Enterovirus of the family Picornaviridae. They comprise multiple serotypes that were historically designated as Echovirus 1, Echovirus 2, and so on. Echoviruses are common human pathogens found worldwide and are a leading cause of aseptic meningitis and mild febrile illnesses, especially in children.

Genome and biology: Echoviruses are non-enveloped, icosahedral viruses with a positive-sense single-stranded RNA genome of about 7.5 kilobases. They replicate in the cytoplasm and use an internal ribosome entry site to translate their proteins. Their life cycle includes attachment to cellular receptors, entry, translation, replication, and release of new virions.

Clinical features: Infection ranges from asymptomatic to mild respiratory or gastrointestinal illness. More significant disease can include aseptic meningitis, encephalitis, myocarditis, and neonatal sepsis-like illness, depending on the serotype and patient age. Most illnesses are mild and self-limiting.

Transmission and epidemiology: Primary spread is fecal-oral, with possible respiratory transmission. Outbreaks occur in settings with close contact, such as daycare centers and schools. Seasonal peaks often occur in summer and autumn in temperate regions, though patterns vary by location and serotype.

Diagnosis and management: Diagnosis is based on detection of viral RNA or virus isolation from stool, throat swabs, or cerebrospinal fluid, supported by serology in some cases. There are no widely used antiviral therapies or vaccines for routine prevention; management is primarily supportive care.

Prevention: Prevention emphasizes good hygiene, handwashing, sanitation, and infection control during outbreaks. Echoviruses are part of the broader group of enteroviruses that includes polioviruses and coxsackieviruses.