Enterovirus is a genus of positive-sense single-stranded RNA viruses associated with several human and mammalian diseases. Enteroviruses are named by their transmission-route through the intestine (enteric meaning intestinal).
Serologic studies have distinguished 71 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: EV-D68, EV-B69, EV-D70, EV-A71, etc.
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, namely poliovirus. There are 81 non-polio and 3 polio enteroviruses that can cause disease in humans. Of the 81 non-polio types, there are 22 Coxsackie A viruses, 6 Coxsackie B viruses, 28 echoviruses, and 25 other enteroviruses.
Poliovirus, as well as coxsackie and echovirus, is spread through the fecal-oral route. Infection can result in a wide variety of symptoms, including those of: mild respiratory illness (the common cold), hand, foot and mouth disease, acute hemorrhagic conjunctivitis, aseptic meningitis, myocarditis, severe neonatal sepsis-like disease, acute flaccid paralysis, and the related acute flaccid myelitis.
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. 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.
- Enterovirus A (formerly Human enterovirus A)
- Enterovirus B (formerly Human enterovirus B)
- Enterovirus C (formerly Human enterovirus C)
- Enterovirus D (formerly Human enterovirus D)
- Enterovirus E (formerly Bovine enterovirus group A)
- Enterovirus F (formerly Bovine enterovirus group B)
- Enterovirus G (formerly Porcine enterovirus B)
- Enterovirus H (formerly Simian enterovirus A)
- Enterovirus I
- Enterovirus J
- Enterovirus K
- Enterovirus L
- Rhinovirus A (formerly Human rhinovirus A)
- Rhinovirus B (formerly Human rhinovirus B)
- Rhinovirus C (formerly Human rhinovirus C)
These fifteen species' serotype include:
- Enterovirus A: serotypes CVA-2, CVA-3, CVA-4, CVA-5, CVA-6, CVA-7, CVA-8, CVA-10, CVA-12, CVA-14, and CVA-16.
- Enterovirus B: serotypes CVB-1, CVB-2, CVB-3, CVB-4, CVB-5, CVB-6, and CVA-9.
- Enterovirus C: serotypes CVA-1, CVA-11, CVA-13, CVA-17, CVA-19, CVA-20, CVA-21, CVA-22, and CVA-24.
- Enterovirus B: serotypes E-1, E-2, E-3, E-4, E-5, E-6, E-7, E-9, E-11 through E-21, E-24, E-25, E-26, E-27, E-29, E-30, E-31, E32, and E-33.
- Enterovirus A: serotypes EV-A71, EV-A76, EV-A89 through EV-A92, EV-A114, EV-A119, EV-A120, EV-A121, SV19, SV43, SV46, and BabEV-A13.
- Enterovirus B: serotypes EV-B69, EV-B73 through EV-B75, EV-B77 through EV-B88, EV-B93, EV-B97, EV-B98, EV-B100, EV-B101, EV-B106, EV-B107, EV-B110 through EV-B113, and SA5.
- Enterovirus C: serotypes EV-C95, EV-C96, EV-C99, EV-C102, EV-C104, EV-C105, EV-C109, EV-C113, EV-C116, EV-C117, and EV-C118.
- Enterovirus D: serotypes EV-D68, EV-D70, EV-D94, EV-D111, and EV-D120.
- Enterovirus E: serotypes EV-E1, EV-E2, EV-E3, EV-E4, and EV-E5.
- Enterovirus F: serotypes EV-F1, EV-F2, EV-F3, EV-F4, EV-F5, EV-F6, and EV-F7.
- Enterovirus G: serotypes EV-G1 through EV-G20.
- Enterovirus H: serotype EV-H.
- Enterovirus I: serotype EV-I1 and EV-I2.
- Enterovirus J: serotypes: EV-J1, EV-J103, and EV-J108.
- Enterovirus K: serotype EV-K1 and EV-K2.
- Enterovirus L: serotype EV-L1.
- Rhinovirus A: serotypes RV-A1, RV-A1B, RV-A2, RV-A7 through RV-A13, RV-A15, RV-A16, RV-A18 through RV-A25, RV-A28 through RV-A34, RV-A36, RV-A38 through RV-A41, RV-A43, RV-A45 through RV-A47, RV-A49 through RV-A51, RV-A53 through RV-A68, RV-A71, RV-A73 through RV-A78, RV-A80 through RV-A82, RV-A85, RV-A88 through RV-A90, RV-A94, RV-A96, and RV-A100 through RV-A108
- Rhinovirus B: serotypes RV-B3 through RV-B6, RV-B14, RV-B17, RV-B26, RV-B27, RV-B35, RV-B37, RV-B42, RV-B48, RV-B52, RV-B69, RV-B70, RV-B72, RV-B79, RV-B83, RV-B84, RV-B86, RV-B91 through RV-B93, RV-B97, and RV-B99 through RV-B104
- Rhinovirus C: serotypes RV-C1 through RV-C51, RV-C54, RV-C55, and RV-C56.
- Enterovirus C: serotypes PV-1, PV-2, and PV-3.
Coxsackie and echovirus
Coxsackie viruses are a non-phylogenetic group. 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 surrounding 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. The usual symptoms of Coxsackie and echovirus are fever, mild rash, and mild upper respiratory tract illness.
Non-cytolytic (non-cytopathic) enterovirus
Enteroviruses are usually only capable of producing acute infections that are rapidly cleared by the adaptive immune response. However genome mutations, which enterovirus B serotypes may acquire in the host during the acute phase, may transform these viruses into the non-cytolytic form (also known as non-cytopathic or defective enterovirus). This is a mutated quasispecies of enterovirus, which can cause persistent infection in human cardiac tissues especially in some patients with myocarditis or dilated cardiomyopathy. In persistent infections viral RNA is present only on very low levels and is not believed to contribute to any ongoing myocardial disease being a fading remnant of a recent acute infection although some scientists think otherwise.
EV-D68 first was identified in California in 1962. Compared with other enteroviruses, it has been rarely reported in the U.S. in the past 40 years. Most people who get infected are infants, children and teens. EV-D68 usually causes mild to severe respiratory illness; however, the full spectrum of EV-D68 illness is not well-defined. Most start with common cold symptoms of runny nose and cough. Some, but not all, may also have fever. For more severe cases, difficulty breathing, wheezing or problems catching your breath may occur. As of October 4, 2014, there has been one death in New Jersey directly linked to EV-D68, as well as one death in Rhode Island attributed to a combination of EV-D68 and sepsis caused by an infection of staphylococcus aureus.
Enterovirus A71 (EV-A71) 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. EV-A71 was first isolated and characterized from cases of neurological disease in California in 1969. To date, little is known about the molecular mechanisms of host response to EV-A71 infection, but increases in the level of mRNAs encoding chemokines, proteins involved in protein degradation, complement proteins, and proapoptotis proteins have been implicated.
There are three serotypes of poliovirus, PV-1, PV-2, and PV-3; each with a slightly different capsid protein. Capsid proteins define cellular receptor specificity and virus antigenicity. PV-1 is the most common form encountered in nature; however, all three forms are extremely infectious. 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. The 39th Executive Committee (EC39) of the International Committee on Taxonomy of Viruses (ICTV) met in Canada during June 2007 with new taxonomic proposals.
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.
- 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.
Proposals approved at the (EC39) meeting of 2007, were sent to members of ICTV via email for ratification and have become official taxonomy. There have been a total of 215 taxonomic proposals, which have been approved and ratified since the 8th ICTV Report of 2005.
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:
- 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.
Diseases caused by enterovirus infection
suspected as the probable cause of encephalitis lethargica, the 1917 - 1926 "sleeping sickness" depicted in the book and movie "awakenings." See Wikipedia entry for encephalitis lethargica.
Enteroviruses cause a wide range of symptoms, and while their long list of signs and symptoms should put them on the differential diagnosis list of many illnesses, they often go unnoticed. Enteroviruses can cause anything from rashes in small children, to summer colds, to encephalitis, to blurred vision, to pericarditis. Enteroviral infections have a great range in presentation and seriousness. Non polio enteroviruses cause 10–15 million infections and tens of thousands of hospitalizations in the US each year. Enteroviruses can be identified through cell culture or PCR assay, collected from fecal or respiratory specimens. Below are common enterovirus related diseases, including poliomyelitis.
- Poliomyelitis primarily via the fecal-oral route
- Polio-like syndrome found in children who tested positive for enterovirus 68.
- Nonspecific febrile illness is the most common presentation of enterovirus infection. Other than fever, symptoms include muscle pain, sore throat, gastrointestinal distress/abdominal discomfort, and headache. In newborns the picture may be that of sepsis, however, and can be severe and life-threatening.
- 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 10–15 million infections.
- Bornholm disease or epidemic pleurodynia is characterized 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.
- Myocarditis is characterized by inflammation of the myocardium (cardiac muscle cells). Over the last couple of decades, numerous culprits have been identified as playing a role in myocarditis pathogenesis in addition to the enterovirus, which at first was the most commonly implicated virus in this pathology. One of the most common enteroviruses found to be responsible for causing Myocarditis is the Coxsackie B3 virus.
- A 2007 study suggested that acute respiratory or gastrointestinal infections associated with enterovirus may be a factor in chronic fatigue syndrome.
- Diabetes mellitus type 1 It has been proposed that type 1 diabetes is a virus-triggered autoimmune response in which the immune system attacks virus-infected cells along with the insulin-producing beta cells in the pancreas. A team working at University of Tampere, Finland has identified a type of enterovirus that has a possible link to type 1 diabetes (which is an autoimmune disease).
Treatment for enteroviral infection is mainly supportive. In cases of pleurodynia, treatment consists of analgesics to relieve the severe pain that occurs in patients with the disease; in some severe cases, opiates may be needed. Treatment for aseptic meningitis caused by enteroviruses is also mainly symptomatic. In patients with enteroviral carditis, treatment consists of the prevention and treatment of complications such as arrhythmias, pericardial effusion, and cardiac failure. Other treatments that have been investigated for enteroviral carditis include intravenous immunoglobulin.
- "Genus: Enterovirus" (html). International Committee on Taxonomy of Viruses (ICTV). Retrieved 5 February 2019.
Derivation of names Entero: from Greek enteron, 'intestine'
- Oberste MS, Maher K, Kilpatrick DR, Pallansch MA (March 1999). "Molecular evolution of the human enteroviruses: correlation of serotype with VP1 sequence and application to picornavirus classification". Journal of Virology. 73 (3): 1941–8. doi:10.1128/JVI.73.3.1941-1948.1999. PMC 104435. PMID 9971773.
- "Overview of Enterovirus Infections". Merck & Co. February 2018. Retrieved 2019-07-17.
- Garcia J, Espejo V, Nelson M, Sovero M, Villaran MV, Gomez J, Barrantes M, Sanchez F, Comach G, Arango AE, Aguayo N, de Rivera IL, Chicaiza W, Jimenez M, Aleman W, Rodriguez F, Gonzales MS, Kochel TJ, Halsey ES (October 2013). "Human rhinoviruses and enteroviruses in influenza-like illness in Latin America". Virology Journal. 10: 305. doi:10.1186/1743-422x-10-305. PMC 3854537. PMID 24119298.
- Li L, He Y, Yang H, Zhu J, Xu X, Dong J, Zhu Y, Jin Q (August 2005). "Genetic characteristics of human enterovirus 71 and coxsackievirus A16 circulating from 1999 to 2004 in Shenzhen, People's Republic of China". Journal of Clinical Microbiology. 43 (8): 3835–9. doi:10.1128/JCM.43.8.3835-3839.2005. PMC 1233905. PMID 16081920.
- Merkle I, van Ooij MJ, van Kuppeveld FJ, Glaudemans DH, Galama JM, Henke A, Zell R, Melchers WJ (October 2002). "Biological significance of a human enterovirus B-specific RNA element in the 3' nontranslated region". Journal of Virology. 76 (19): 9900–9. doi:10.1128/JVI.76.19.9900-9909.2002. PMC 136489. PMID 12208967.
- "ICTV Master Species List 2018 - (10th Report) - Master Species Lists - Master Species Lists - ICTV Collaboration". ictvonline.org. 2018-07-01. Retrieved 2019-02-19.
- "ICTV Master Species List 2017 – (10th Report) – Master Species Lists – Master Species Lists – ICTV Collaboration". ictvonline.org. 2017-07-01. Retrieved 2018-07-29.
- Santti J, Harvala H, Kinnunen L, Hyypiä T (May 2000). "Molecular epidemiology and evolution of coxsackievirus A9" (PDF). The Journal of General Virology. 81 (Pt 5): 1361–72. doi:10.1099/0022-1317-81-5-1361. PMID 10769080. Archived from the original (PDF) on 2010-06-01. Retrieved 2009-08-09.
- Kim KS, Tracy S, Tapprich W, Bailey J, Lee CK, Kim K, Barry WH, Chapman NM (June 2005). "5'-Terminal deletions occur in coxsackievirus B3 during replication in murine hearts and cardiac myocyte cultures and correlate with encapsidation of negative-strand viral RNA". Journal of Virology. 79 (11): 7024–7041. doi:10.1128/JVI.79.11.7024-7041.2005. PMC 1112132. PMID 15890942.
- Flynn CT, Kimura T, Frimpong-Boateng K, Harkins S, Whitton JL (December 2017). "Immunological and pathological consequences of coxsackievirus RNA persistence in the heart". Virology. 512: 104–112. doi:10.1016/j.virol.2017.09.017. PMC 5653433. PMID 28950225.
- "Persistent Coxsackievirus Infection: Enterovirus Persistence in Chronic Myocarditis and Dilated Cardiomyopathy". Group B coxsackieviruses. Tracy, S. (Steven), Oberste, M. Steven., Drescher, Kristen M. Berlin: Springer. 2008. pp. 275–286. ISBN 9783540755463. OCLC 233973571.CS1 maint: others (link)
- Zhang, Hongyi; Li, Yanwen; McClean, Dougal R; Richardson, Peter J; Latif, Najma; Dunn, Michael J; Archard, Leonard C; Florio, Richard; Sheppard, Mary; Morrison, Karen (2004). "Detection of enterovirus capsid protein VP1 in myocardium from cases of myocarditis or dilated cardiomyopathy by immunohistochemistry: Further evidence of enterovirus persistence in myocytes". Medical Microbiology and Immunology. 193 (2–3): 109–114. doi:10.1007/s00430-003-0208-8. PMID 14634804.
- Mohney G (4 October 2014). "Medical Examiner Finds NJ Preschooler Died Due to Enterovirus 68". ABCNews. Retrieved 6 October 2014.
- "The facts about enterovirus D68". Childrensmn.org. Children's Hospitals and Clinics of Minnesota. Archived from the original on 2014-10-06. Retrieved 2014-02-25.
- Malone S (1 October 2014). "Rhode Island child with Enterovirus dies after infection: officials". Reuters. Retrieved 6 October 2014.
- Lin TY, Chu C, Chiu CH (October 2002). "Lactoferrin inhibits enterovirus 71 infection of human embryonal rhabdomyosarcoma cells in vitro". The Journal of Infectious Diseases. 186 (8): 1161–1164. doi:10.1086/343809. PMID 12355368.
- Wang JR, Tuan YC, Tsai HP, Yan JJ, Liu CC, Su IJ (January 2002). "Change of major genotype of enterovirus 71 in outbreaks of hand-foot-and-mouth disease in Taiwan between 1998 and 2000". Journal of Clinical Microbiology. 40 (1): 10–15. doi:10.1128/JCM.40.1.10-15.2002. PMC 120096. PMID 11773085.
- Laboratory Investigation of a Suspected Enterovirus 71 Outbreak Archived 2008-05-28 at the Wayback Machine
- Shih SR, Stollar V, Lin JY, Chang SC, Chen GW, Li ML (October 2004). "Identification of genes involved in the host response to enterovirus 71 infection". Journal of Neurovirology. 10 (5): 293–304. doi:10.1080/13550280490499551. PMID 15385252.
- Paul JR (1971). A History of Poliomyelitis. (Yale studies in the history of science and medicine). New Haven, Conn: Yale University Press. ISBN 978-0-300-01324-5.
- "ICTV Newsletter #6 2008" (PDF). ICTV. February 2008. p. 1.
- "2005.261-262V.04.Polio.pdf – Vertebrate (through 2014) – Approved Proposals since the 8th Report – ICTV Collaboration". Talk.ictvonline.org. 2008-03-05. Retrieved 2016-04-14.
- "2005.263V.04.TypeSpEntero.pdf – Vertebrate (through 2014) – Approved Proposals since the 8th Report – ICTV Collaboration". Talk.ictvonline.org. 2008-03-05. Retrieved 2016-04-14.
- "ICTV Newsletter #7 2009" (PDF). ICTV. October 2009. p. 1.
- "Non-Polio Enterovirus | Home | Picornavirus | CDC". www.cdc.gov. Retrieved 2017-03-22.
- "Non-Polio Enterovirus | For Health Care Professionals | Picornavirus | CDC". www.cdc.gov. Retrieved 2017-03-22.
- Seroka, Rachel (23 February 2014). "Mysterious polio-like illness found in 5 California children". American Academy of Neurology. Retrieved 24 February 2014.
- "Mysterious Polio-Like Illness Found in California Children". Voice of America. February 24, 2014. Retrieved 24 February 2014.
- "Pediatric Enteroviral Infections Clinical Presentation: History, Physical, Causes". emedicine.medscape.com. Retrieved 2018-07-21.
- "Non-Polio Enterovirus Infections". CDC. 8 September 2014. Retrieved 9 September 2014.
- Schultz JC, Hilliard AA, Cooper LT, Rihal CS (November 2009). "Diagnosis and treatment of viral myocarditis". Mayo Clinic Proceedings. 84 (11): 1001–9. doi:10.1016/S0025-6196(11)60670-8. PMC 2770911. PMID 19880690.
- Schultz JC, Hilliard AA, Cooper LT, Rihal CS (November 2009). "Diagnosis and treatment of viral myocarditis". Mayo Clinic Proceedings. 84 (11): 1001–9. doi:10.1016/S0025-6196(11)60670-8. PMC 2770911. PMID 19880690.
- Chia JK, Chia AY (January 2008). "Chronic fatigue syndrome is associated with chronic enterovirus infection of the stomach". Journal of Clinical Pathology. 61 (1): 43–8. doi:10.1136/jcp.2007.050054. PMID 17872383.
- Fairweather D, Rose NR (April 2002). "Type 1 diabetes: virus infection or autoimmune disease?". Nature Immunology. 3 (4): 338–40. doi:10.1038/ni0402-338. PMID 11919574.
- "Finnish team makes diabetes vaccine breakthrough | Yle Uutiset". Yle.fi. Retrieved 2016-04-14.
- Laitinen OH, Honkanen H, Pakkanen O, Oikarinen S, Hankaniemi MM, Huhtala H, Ruokoranta T, Lecouturier V, André P, Harju R, Virtanen SM, Lehtonen J, Almond JW, Simell T, Simell O, Ilonen J, Veijola R, Knip M, Hyöty H (February 2014). "Coxsackievirus B1 is associated with induction of β-cell autoimmunity that portends type 1 diabetes". Diabetes. 63 (2): 446–55. doi:10.2337/db13-0619. PMID 23974921.
- Schwartz RA (2018-10-05). "Enteroviruses Treatment & Management". Medscape.