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Coxsackieviruses are divided into group A and group B viruses based on early observations of their pathogenicity in neonatal mice. [1] Group A coxsackieviruses were noted to cause a flaccid paralysis (which was caused by generalized myositis) while group B coxsackieviruses were noted to cause a spastic paralysis (due to focal muscle injury and degeneration of neuronal tissue).
Coxsackie B infections usually do not cause serious disease, although for newborns in the first 1–2 weeks of life, Coxsackie B infections can easily be fatal. [2] The pancreas is a frequent target, which can cause pancreatitis. [2] Coxsackie B3 (CB3) infections are the most common enterovirus cause of myocarditis and sudden cardiac death. [8]
Coxsackie B4 virus and type 1 diabetes [ edit ] One theory proposes that type 1 diabetes is a virus-triggered autoimmune response in which the immune system attacks virus-infected cells along with the beta cells in the pancreas , [ 8 ] [ 9 ] but to date there is no stringent evidence to support this hypothesis in humans.
Coxsackie A virus is a subgroup of enterovirus A, which are small, non-enveloped, positive-sense, single-stranded RNA viruses. Its protective, icosahedral capsid has an external portion that contains sixty copies of viral proteins (VP1,-2,-3) and an internal portion surrounding the RNA genome containing sixty copies of VP4 viral proteins.
Herpangina, also called mouth blisters, is a painful mouth infection caused by coxsackieviruses.Usually, herpangina is produced by one particular strain of coxsackie virus A (and the term "herpangina virus" refers to coxsackievirus A), [1] but it can also be caused by coxsackievirus B or echoviruses. [2]
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. [50] One of the most common enteroviruses found to be responsible for causing Myocarditis is the Coxsackie B3 virus. [50]
Echovirus 9 (also known as E-9, E.C.H.O. 9, and formerly Coxsackie A23 or A23 virus) [1] is a serotype of echovirus. When first discovered, it was labelled as a coxsackie A virus, A23. It was later discovered that A23 was an echovirus antigenically identical to the already-known echovirus 9. [2] Echovirus 9 is the most common enterovirus type. [3]
Echovirus types 1,6,8,9, and 19 and Coxsackie A virus types 4,6,9, and 10 are associated with Bornholm disease. The most common strains causing Bornholm disease are Coxsackie B3 and A9. Viral proliferation in the muscles of the chest wall, diaphragm, and abdomen are thought to contribute to the typical presentation that characterizes the illness.