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Encyclopedia > Adenovirus


Adenoviruses
Virus classification
Group: Group I (dsDNA)
Family: Adenoviridae
Genera

Mastadenovirus
Aviadenovirus
Atadenovirus
Siadenovirus

Adenoviruses are viruses of the family Adenoviridae. They infect both humans and animals. Adenoviruses were first isolated in human adenoids, from which the name is derived.


Adenoviruses are medium_sized (90_100 nm), nonenveloped icosahedral viruses containing double-stranded DNA. There are 51 immunologically distinct types (6 subgenera: A through F) that can cause human infections. Adenoviruses are unusually stable to chemical or physical agents and adverse pH conditions, allowing for prolonged survival outside of the body.

Contents

Adenoviruses in Humans

Enlarge
Adenovirus, compared to other types of viruses.

Clinical features

Adenoviruses most commonly cause illness of the respiratory system; however, depending on the infecting serotype, they may also cause various other illnesses, such as gastroenteritis, cystitis, and rash illness. Symptoms of respiratory illness caused by adenovirus infection range from the common cold syndrome to pneumonia, croup, and bronchitis. Patients with compromised immune systems are especially susceptible to severe complications of adenovirus infection. Acute respiratory disease (ARD), first recognized among military recruits during World War II, can be caused by adenovirus infections during conditions of crowding and stress.


Epidemiologic features

Although epidemiologic characteristics of the adenoviruses vary by type, all are transmitted by direct contact, fecal-oral transmission, and occasionally waterborne transmission. Some types are capable of establishing persistent asymptomatic infections in tonsils, adenoids, and intestines of infected hosts, and shedding can occur for months or years. Some adenoviruses (e.g., serotypes 1, 2, 5, and 6) have been shown to be endemic in parts of the world where they have been studied, and infection is usually acquired during childhood. Other types cause sporadic infection and occasional outbreaks; for example, epidemic keratoconjunctivitis is associated with adenovirus serotypes 8, 19, and 37. Epidemics of febrile disease with conjunctivitis are associated with waterborne transmission of some adenovirus types, often centering around inadequately chlorinated swimming pools and small lakes. ARD is most often associated with adenovirus types 4 and 7 in the United States. Enteric adenoviruses 40 and 41 cause gastroenteritis, usually in children. For some adenovirus serotypes, the clinical spectrum of disease associated with infection varies depending on the site of infection; for example, infection with adenovirus 7 acquired by inhalation is associated with severe lower respiratory tract disease, whereas oral transmission of the virus typically causes no or mild disease. Outbreaks of adenovirus-associated respiratory disease have been more common in the late winter, spring, and early summer; however, adenovirus infections can occur throughout the year.


Diagnosis

Antigen detection, polymerase chain reaction assay, virus isolation, and serology can be used to identify adenovirus infections. Adenovirus typing is usually accomplished by hemagglutination_inhibition and/or neutralization with type_specific antisera. Since adenovirus can be excreted for prolonged periods, the presence of virus does not necessarily mean it is associated with disease.


Treatment

Most infections are mild and require no therapy or only symptomatic treatment. Because there is no virus_specific therapy, serious adenovirus illness can be managed only by treating symptoms and complications of the infection.


Prevention

Vaccines were developed for adenovirus serotypes 4 and 7, but were available only for preventing ARD among military recruits. Strict attention to good infection-control practices is effective for stopping nosocomial outbreaks of adenovirus-associated disease, such as epidemic keratoconjunctivitis. Maintaining adequate levels of chlorination is necessary for preventing swimming pool-associated outbreaks of adenovirus conjunctivitis.


See also

  • AD-36

Sources



  Results from FactBites:
 
Centers for Disease Control and Prevention: Respiratory and Enteric Viruses Branch (548 words)
Symptoms of respiratory illness caused by adenovirus infection range from the common cold syndrome to pneumonia, croup, and bronchitis.
For some adenovirus serotypes, the clinical spectrum of disease associated with infection varies depending on the site of infection; for example, infection with adenovirus 7 acquired by inhalation is associated with severe lower respiratory tract disease, whereas oral transmission of the virus typically causes no or mild disease.
Adenovirus typing is usually accomplished by hemagglutination-inhibition and/or neutralization with type-specific antisera.
Adenovirus definition - Allergies: Allergy Symptoms, Treatment, and Medications on MedicineNet.com (644 words)
Adenovirus: A group of viruses responsible for a spectrum of respiratory disease as well as infection of the stomach and intestine (gastroenteritis), eyes (conjunctivitis), and bladder (cystitis) and rash.
For example, infection with adenovirus 7 acquired by inhalation is associated with severe lower respiratory tract disease, whereas oral transmission of the virus typically causes no or mild disease.
Adenovirus infection is diagnosed in the laboratory by antigen detection, polymerase chain reaction (PCR), virus isolation, and serology.
  More results at FactBites »

 
 

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