Enteroviruses are a genus of positive-sense single-stranded RNA viruses associated with several human and mammalian diseases. Serologic studies have distinguished 66 human enterovirus serotypes on the basis of antibody neutralization tests. Additional antigenic variants have been defined within several of the serotypes on the basis of reduced or nonreciprocal cross-neutralization between variant strains. On the basis of their pathogenesis in humans and animals, the enteroviruses were originally classified into four groups, polioviruses, Coxsackie A viruses (CA), Coxsackie B viruses (CB), and echoviruses, but it was quickly realized that there were significant overlaps in the biological properties of viruses in the different groups. Enteroviruses isolated more recently are named with a system of consecutive numbers: EV68, EV69, EV70, and EV71, etc.[1]
Enteroviruses affect millions of people worldwide each year, and are often found in the respiratory secretions (e.g., saliva, sputum, or nasal mucus) and stool of an infected person. Historically, poliomyelitis was the most significant disease caused by an enterovirus, poliovirus. There are 62 non-polio enteroviruses that can cause disease in humans: 23 Coxsackie A viruses, 6 Coxsackie B viruses, 28 echoviruses, and 5 other enteroviruses.[2] Poliovirus, as well as coxsackie and echovirus are spread through the fecal-oral route. Infection can result in a wide variety of symptoms ranging from mild respiratory illness (common cold), hand, foot and mouth disease, acute hemorrhagic conjunctivitis, aseptic meningitis, myocarditis, severe neonatal sepsis-like disease, and acute flaccid paralysis.[2]
Species and genetics
Enteroviruses are members of the picornavirus family, a large and diverse group of small RNA viruses characterized by a single positive-strand genomic RNA. All enteroviruses contain a genome of approximately 7,500 bases and are known to have a high mutation rate due to low-fidelity replication and frequent recombination.[3] After infection of the host cell, the genome is translated in a cap-independent manner into a single polyprotein, which is subsequently processed by virus-encoded proteases into the structural capsid proteins and the nonstructural proteins, which are mainly involved in the replication of the virus.[4]The enterovirus genus includes the following ten species:[5]
- Bovine enterovirus
- Human enterovirus A
- Human enterovirus B
- Human enterovirus C
- Human enterovirus D
- Human rhinovirus A
- Human rhinovirus B
- Human rhinovirus C
- Porcine enterovirus B
- Simian enterovirus A
- Coxsackievirus
- serotypes CV-A2, CV-A3, CV-A4, CV-A5, CV-A6, CV-A7, CV-A8, CV-A10, CV-A12, CV-A14, & CV-A16 found under the species: Human enterovirus A.
- serotypes CV-B1, CV-B2, CV-B3, CV-B4, CV-B5, CV-B6, CV-A9, & CV-A23 found under the species: Human enterovirus B.
- serotypes CV-A1, CV-A11, CV-A13, CV-A17, CV-A19, CV-A20, CV-A21, CV-A22, & CV-A24 found under the species: Human enterovirus C.
- Echovirus
- serotypes E-1, E-2, E-3, E-4, E-5, E-6, E-7, E-8, E-9, E-11, E-12,
E-13, E-14, E-15, E-16, E-17, E-18, E-19, E20, E-21, E-24, E-25,
E-26, E-27, E-29, E-30, E-31, E-32, & E-33 found under the species: Human enterovirus B.
- serotypes E-1, E-2, E-3, E-4, E-5, E-6, E-7, E-8, E-9, E-11, E-12,
E-13, E-14, E-15, E-16, E-17, E-18, E-19, E20, E-21, E-24, E-25,
- Enterovirus
- serotypes EV-71, EV-76, EV-89, EV-90, EV-91, & EV-92 found under the species: Human enterovirus A.
- serotypes EV-69, EV-73, EV-74, EV-75, EV-77, EV-78, EV-79, EV-80, EV-81, EV-82, EV-83, EV-84, EV-85, EV-86, EV-87, EV-88,
EV-93, EV-97, EV-98, EV-100, EV-101, EV-106, & EV-107 found under the species: Human enterovirus B. - serotypes EV-95, EV-96, EV-99, EV-102, EV-104, EV-105, EV-109 & EV-116 found under the species: Human enterovirus C.
- serotypes EV-68, EV-70, & EV-94 found under the species: Human enterovirus D.
- Human rhinovirus
- serotypes HRV-1, HRV-2, HRV-7, HRV-8, HRV-9, HRV-10, HRV-11, HRV-12, HRV-13, HRV-15, HRV-16, HRV-18, HRV-19, HRV-20,
HRV-21, HRV-22, HRV-23, HRV-24, HRV-25, HRV-28, HRV-29, HRV-30, HRV-31, HRV-32, HRV-33, HRV-34, HRV-36,
HRV-38, HRV-39, HRV-40, HRV-41, HRV-43, HRV-44, HRV-45, HRV-46, HRV-47, HRV-49, HRV-50, HRV-51, HRV-53,
HRV-54, HRV-55, HRV-56, HRV-57, HRV-58, HRV-59, HRV-60, HRV-61, HRV-62, HRV-63, HRV-64, HRV-65, HRV-66,
HRV-67, HRV-68, HRV-71, HRV-73, HRV-74, HRV-75, HRV-76, HRV-77, HRV-78, HRV-80, HRV-81, HRV-82, HRV-85,
HRV-88, HRV-89, HRV-90, HRV-94, HRV-95, HRV-96, HRV-98, & HRV-100 found under the species: Human rhinovirus A. - serotypes HRV-3, HRV-4, HRV-5, HRV-6, HRV-14, HRV-17, HRV-26, HRV-27, HRV-35, HRV-37, HRV-42, HRV-48, HRV-52, HRV-69, HRV-70,
HRV-72, HRV-79, HRV-83, HRV-84, HRV-86, HRV-91, HRV-92, HRV-93, HRV-97, & HRV-99 found under the species: Human rhinovirus B.
- serotypes HRV-1, HRV-2, HRV-7, HRV-8, HRV-9, HRV-10, HRV-11, HRV-12, HRV-13, HRV-15, HRV-16, HRV-18, HRV-19, HRV-20,
- Poliovirus
- serotypes PV-1, PV-2, & PV-3 found under the species: Human enterovirus C.[6]
Coxsackie and echovirus
Coxsackie viruses are a non-phylogenetic group.[7] Coxsackie A viruses are mainly associated with human hand, foot and mouth disease. Coxsackie B viruses can cause signs and symptoms, similar to a "cold", but these viruses also can lead to more serious diseases, including myocarditis (inflammation of the heart); pericarditis (inflammation of the sac lining the heart); meningitis (inflammation of the membranes that line the brain and spinal cord); and pancreatitis (inflammation of the pancreas).Echoviruses are a cause of many of the nonspecific viral infections. It is mainly found in the intestine, and can cause nervous disorders.[citation needed] The usual symptoms of Coxsackie and echovirus are fever, mild rash, and mild upper respiratory tract (URT) illness.[citation needed]
Enterovirus 71
Main article: EV-71
Enterovirus 71 (EV-71) is notable as one of the major causative agents for hand, foot and mouth disease (HFMD), and is sometimes associated with severe central nervous system diseases.[8] EV71 was first isolated and characterized from cases of neurological disease in California in 1969.[9][10]
To date, little is known about the molecular mechanisms of host
response to EV71 infection, but increases in the level of mRNAs encoding
chemokines, proteins involved in protein degradation, complement
proteins, and proapoptotis proteins have been implicated.[11]Poliovirus
Main article: Poliovirus
There are three serotypes of poliovirus, PV1, PV2, and PV3; each with a slightly different capsid protein. Capsid proteins define cellular receptor specificity and virus antigenicity. PV1 is the most common form encountered in nature; however, all three forms are extremely infectious.[12] Poliovirus can affect the spinal cord and cause poliomyelitis.Polioviruses were formerly classified as a species belonging to the genus Enterovirus in the family Picornaviridae. The Poliovirus species has been eliminated from the genus Enterovirus. The following serotypes, Human poliovirus 1, Human poliovirus 2, and Human poliovirus 3, were assigned to the species Human enterovirus C, in the genus Enterovirus in the family Picornaviridae. The type species of the genus Enterovirus was changed from Poliovirus to Human enterovirus C. This has been ratified in April 2008.[13] The 39th Executive Committee (EC39) of the International Committee on Taxonomy of Viruses (ICTV) met in Canada during June 2007 with new taxonomic proposals.[14]
Two of the proposals with three changes were:
- Code 2005.261V.04: To remove the following species Poliovirus from the existing genus Enterovirus in the family Picornaviridae.
- Code 2005.262V.04: To assign the viruses; PV-1, PV-2, PV-3 to the existing species Human enterovirus C in the genus Enterovirus in the family Picornaviridae.[15]
- Code 2005.263V.04: To change the type species Poliovirus from the existing genus Enterovirus in the family Picornaviridae to the type species Human enterovirus C.[16]
The ratification process was performed by email. The proposals were sent electronically via email on March 18, 2008 to ICTV members with a request to vote on whether to ratify the taxonomic proposals, with a 1-month deadline. The following are two of the taxonomic proposals with three changes that were ratified by ICTV members in April 2008:
Picornaviruses
- 2005.261V.04: To remove the following species from the existing genus Enterovirus in the family Picornaviridae: Poliovirus.
(Note: Poliovirus hereby loses its status as a virus species). - 2005.262V.04: To assign the following viruses to the species Human enterovirus C in the existing genus Enterovirus in the family Picornaviridae: Human poliovirus 1, Human poliovirus 2, Human poliovirus 3. (This is not strictly necessary as a taxonomic proposal because it concerns entities below the species level, but it is left in to clarify this reorganization of the Picornaviridae).
- 2005.263V.04: To change the type species of the genus Enterovirus in the family Picornaviridae, from Poliovirus to Human enterovirus C.[13]
Rhinovirus
Main article: Rhinovirus
There are three species of Rhinoviruses: Human Rhinovirus A, Human
Rhinovirus B, and Human Rhinovirus C which contain over 100 serotypes.
Rhinoviruses are the most suspected causative agents of the common cold. This makes it difficult to develop a single vaccine against so many serotypes.Diseases caused by enterovirus infection
- Poliomyelitis is the most notable disease caused by enterovirus infection.
- Nonspecific febrile illness is the most common presentation of enterovirus infection. Other than fever, symptoms include muscle pain, sore throat, gastrointestinal distress, and headache. Abdominal discomfort may also be reported in some patients.
- Enteroviruses are by far the most common causes of aseptic meningitis in children. In the United States, enteroviruses are responsible for 30,000 to 50,000 meningitis hospitalizations per year as a result of 30 million to 50 million infections.[2]
- Pleurodynia is characerized by severe paroxysmal pain in the chest and abdomen, along with fever, and sometimes nausea, headache, and emesis.
- Pericarditis and/or myocarditis are typically caused by enteroviruses; symptoms consist of fever with dyspnea and chest pain. Arrhythmias, heart failure, and myocardial infarction have also been reported.
- Acute hemorrhagic conjunctivitis can be caused by enteroviruses.
- Herpangina is caused by Coxsackie A virus, and causes a vesicular rash in the oral cavity and on the pharynx, along with high fever, sore throat, malaise, and often dysphagia, loss of appetite, back pain, and headache. It is also self-limiting, with symptoms typically ending in 3–4 days.
- Hand, foot and mouth disease is a childhood illness most commonly caused by infection by Coxsackie A virus or EV71.
- Encephalitis is rare manifestation of enterovirus infection; when it occurs, the most frequent enterovirus found to be causing it is echovirus 9.
- Bornholm disease is enteroviral in origin.
- A 2007 study suggested that acute respiratory or gastrointestinal infections associated with enterovirus may be a factor in chronic fatigue syndrome.[19]
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