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Coxsackie Virus (cont.)

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What are the types of coxsackie viruses, and what can they cause?

Coxsackie viruses are separable into two groups, A (CVA) and B (CVB), which are based on their effects on newborn mice (coxsackie A results in muscle injury, paralysis, and death; coxsackie B results in organ damage but less severe outcomes.) There are over 24 different serotypes of the virus (having distinct proteins on the viral surface). Coxsackie viruses infect host cells and cause host cells to break open (lyse).

Picture of the Coxsackie virus
Picture of the coxsackie virus; SOURCE: CDC

Type A viruses cause herpangina (painful blisters in the mouth, throat, hands, feet, or in all these areas). Hand, foot, and mouth disease (HFMD) is the common name of this viral infection. Coxsackie A 16 (CVA16) causes the majority of HFMD infections in the U.S. It usually occurs in children (age 10 and under), but adults can also develop the condition. This childhood disease should not be confused with the "foot and mouth disease" usually found in animals with hooves (for example, cattle, pigs, and deer). Type A viruses also cause inflammation of the eyelids and white area of the eye (conjunctivitis).

Type B viruses cause epidemic pleurodynia (fever, lung, and abdominal pain with headache that lasts about two to 12 days and resolves). Epidemic pleurodynia is also termed Bornholm disease. There are six serotypes of coxsackie B (1-6, with B 4 considered by some researchers as a possible cause of diabetes in a number of individuals).

Both types of viruses (A and B) can cause meningitis, myocarditis, and pericarditis, but these occur infrequently from coxsackie infections. Some researchers suggest coxsackie virus (mainly coxsackie B4) has a role in the development of acute onset type I (formerly known as juvenile) diabetes, but this relationship is still under investigation.

Coxsackie viruses and other enteroviruses may cause the childhood disease of hand, foot, and mouth disease. However, the majority of children with coxsackie virus infections completely resolve the symptoms and infection in about 10-12 days.

Enterovirus 71, like coxsackie virus, also causes HFMD. In Asia in July 2012, particularly Cambodia, children infected with enterovirus 71 (EV-71) had a high mortality rate. This epidemic (mainly in babies, toddlers, and children under 2 years of age) is still under intense investigation, and it is likely researchers will have a better understanding of this high death rate linked to EV-71. The research is ongoing and some investigators have suggested that mortality in children occurs from a combination of enterovirus 71, Streptococcus suis, and dengue viral coinfections. Treatment with steroids was also implicated in the disease process.

Medically Reviewed by a Doctor on 7/11/2014

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Source: MedicineNet.com
http://www.medicinenet.com/coxsackie_virus/article.htm

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