Viral hepatitis

Viral hepatitis
Micrograph showing ground glass hepatocytes, which are seen in chronic hepatitis B infections (a type of viral hepatitis), and represent accumulations of viral antigen in the endoplasmic reticulum. H&E stain.
SpecialtyGastroenterology
SymptomsNone, fever, tiredness, abdominal pain, vomiting, dark urine, yellowish skin[1]
ComplicationsCirrhosis, liver failure, liver cancer[2]
DurationShort or long-term[2]
CausesHepatitis A, B, C, D, E, X[2]
Diagnostic methodBlood tests[3]
PreventionVaccination, sanitation[1][4]
TreatmentSupportive, medications, liver transplant[1]
FrequencyShort-term: >10 million[5][6]
Long-term: 325 million[7]

Viral hepatitis is liver inflammation (hepatitis) due to a viral infection.[2] It may present as a short-term (acute) or long-term (chronic) infection.[2][1] Symptoms may vary from none, to fever, tiredness, abdominal pain, vomiting, dark urine, and yellowish skin.[1] The long-term form can result in cirrhosis, liver failure, or liver cancer.[2]

Most commonly it occurs due to five unrelated viruses hepatitis A, B, C, D, or E.[2] Hepatitis A and E typically spread through food and water that have been contaminated with stool.[2] Hepatitis B, C, and D are typically spread through contact with infected blood.[2] Cases were the cause is not clear may be called non-A–E hepatitis or hepatitis X.[2] A number of other viruses, such as herpes simplex, have been implicated.[8] Diagnosis is by blood tests.[3]

Hepatitis A and B can be prevented by vaccination, while hepatitis A and E can be prevented by improvements in sanitation.[1][4] Hepatitis A and E will often resolve on their own.[2][1] Effective treatments for long-term hepatitis C are available but costly.[9][10] Medications may also be used for long-term hepatitis B.[11] Liver transplant may be required to address complications.[1]

Long-term viral hepatitis affects about 325 million people globally (257 million with hepatitis B and 71 million with hepatitis C).[7][4] Outbreaks of hepatitis A and E occur worldwide, affecting at least 10 million people a year, mostly in developing countries.[4][5][6] It is the most common cause of liver inflammation.[1] In 2013, about 1.5 million people died from viral hepatitis, most commonly due to hepatitis B and C.[12] East Asia and South Asia are the most commonly affected regions.[12] Infectious hepatitis was first determined in the 1940s.[5]

Types

The most common cause of hepatitis is viral,[13] although the effects of various viruses are all classified under the disease hepatitis, these viruses are not all related as seen below in chart.

Hepatitis viruses
Hepatitis A (HAV)[14][15][16] Hepatitis B (HBV)[17][18][19] Hepatitis C (HCV)[20][21] Hepatitis D (HDV)[22][23] Hepatitis E (HEV)[24][25]
Viral species Hepatovirus A Hepatitis B virus Hepacivirus C Hepatitis delta virus Orthohepevirus A
Viral family Picornaviridae Hepadnaviridae Flaviviridae Incertae sedis Hepeviridae
Genome (+)ssRNA dsDNA-RT (+)ssRNA (−)ssRNA (+)ssRNA
Antigens HBsAg, HBeAg Core antigen Delta antigen
Transmission Enteral Parenteral Parenteral Parenteral Enteral
Incubation period 20–40 days 45–160 days 15–150 days 30–60 days 15–60 days
Severity/Chronicity Mild; acute Occasionally severe; 5–10% chronic Subclinical; 70% chronic Exacerbates symptoms of HBV; chronic with HBV Mild in normal patients; severe in pregnant women; acute
Vaccine 10 year protection 3 injections, lifetime protection None available None available Investigational (approved in China)

Hepatitis A

Main article: Hepatitis A
Hepatitis A virus

Hepatitis A or infectious jaundice is caused by hepatitis A virus (HAV), a picornavirus transmitted by the fecal-oral route often associated with ingestion of contaminated food. It causes an acute form of hepatitis and does not have a chronic stage. The patient's immune system makes antibodies against HAV that confer immunity against future infection. People with hepatitis A are advised to rest, stay hydrated and avoid alcohol. A vaccine is available that will prevent HAV infection for up to 10 years. Hepatitis A can be spread through personal contact, consumption of raw sea food, or drinking contaminated water. This occurs primarily in third world countries. Strict personal hygiene and the avoidance of raw and unpeeled foods can help prevent an infection. Infected people excrete HAV with their feces two weeks before and one week after the appearance of jaundice. The time between the infection and the start of the illness averages 28 days (ranging from 15 to 50 days),[26] and most recover fully within 2 months, although approximately 15% of sufferers may experience continuous or relapsing symptoms from six months to a year following initial diagnosis.[27]

Hepatitis A[28]
MarkerDetection TimeDescriptionSignificance
Faecal HAV2–4 weeks or 28 days–Early detection
Ig M anti HAV4–12 weeksEnzyme immunoassay for antibodiesDuring acute Illness
Ig G anti HAV5 weeks–persistentEnzyme immunoassay for antibodiesOld infection or reinfection

Hepatitis B

Main article: Hepatitis B
Hepatitis B virus

Hepatitis B is caused by the hepatitis B virus, a hepadnavirus that can cause both acute and chronic hepatitis. Chronic hepatitis develops in the 15% of adults who are unable to eliminate the virus after an initial infection. Identified methods of transmission include contact with blood, blood transfusion , sex (through sexual intercourse or contact with bodily fluids), or mother-to-child by breast feeding;[11][19] there is minimal evidence of transplacental crossing. Blood contact can occur by sharing syringes in intravenous drug use, shaving accessories such as razor blades, or touching wounds on infected persons, hence needle-exchange programmes have been created in many countries as a form of prevention.[29][30]

Individuals with chronic hepatitis B have antibodies against the virus, but not enough to clear the infected liver cells. The continued production of virus and countervailing antibodies is a likely cause of the immune complex disease seen in these patients. A vaccine is available to prevent infection for life, Hepatitis B infections result in two billion people having been infected worldwide of which 360 million have chronic infection. Hepatitis B is endemic in a number of countries, making cirrhosis and hepatocellular carcinoma big killers.[19][31][32]

There are eight treatment options approved by the U.S. Food and Drug Administration (FDA) available for persons with a chronic hepatitis B infection: alpha-interferon, pegylated interferon, adefovir, entecavir, telbivudine, lamivudine, tenofovir disoproxil and tenofovir alafenamide with a 65% rate of sustained response.[11][19][33]

Hepatitis C

Drawing of the hepatitis C virus
Main article: Hepatitis C

Hepatitis C (originally "non-A non-B hepatitis") is caused by hepatitis C virus (HCV), an RNA virus of the family Flaviviridae. HCV can be transmitted through contact with blood (including through sexual contact if the two parties' blood is mixed) and can also cross the placenta. Hepatitis C usually leads to chronic hepatitis, culminating in cirrhosis in some people. It usually remains asymptomatic for decades. Patients with hepatitis C are susceptible to severe hepatitis if they contract either hepatitis A or B, so all persons with hepatitis C should be immunized against hepatitis A and hepatitis B if they are not already immune, and avoid alcohol. HCV can lead to the development of hepatocellular carcinoma, however, only a minority of HCV-infected individuals develop cancer (1-4% annually), suggesting a complex interplay between viral gene expression and host and environmental factors to promote carcinogenesis. The risk is increased two-fold with active HBV coinfection and a 21% increase in mortality compared to those with latent HBV and HCV.[34][35] HCV viral levels can be reduced to undetectable levels by a combination of interferon and the antiviral drug ribavirin. The genotype of the virus is the primary determinant of the rate of response to this treatment regimen, with genotype 1 being the most resistant.[36]

Hepatitis C is the most common chronic blood-borne infection in the United States.[37]

Hepatitis C[38]
MarkerDetection TimeDescriptionSignificanceNote
HCV-RNA1–3 weeks or 21 daysPCRDemonstrates presence or absence of virusResults may be intermittent during course of infection. Negative result is not indicative of absence.
anti-HCV5–6 weeksEnzyme Immunoassay for antibodiesDemonstrates past or present infectionHigh false positive in those with autoimmune disorders and populations with low virus prevalence.
ALT5–6 weeks–Peak in ALT coincides with peak in anti-HCVFluctuating ALT levels is an indication of active liver disease.

Liver cancer

Liver carcinoma

Hepatitis C causes acute and chronic infections that is a major cause of hepatocellular carcinoma (HCC).[39]

A major cause of death in HCC patients with chronic HCV infection. The pathogenesis of HCC associated with HCV, that virus play direct and indirect roles.[40]A major risk for the development of HCC is persistent infection with HCV and the highest risk for HCC development is associated with co-infection of HBV with HDV, HCV or HIV.[41]

The risk factors lead to development of HCC in chronic HCV is synchronous liver diseases, viral genotype, lifestyle factors and presence of obesity and diabetes mellitus. The lifestyle factors such as smoking, alcohol use and coffee drinking accelerated progression to HCC in HCV.[42][43]

The purpose of HCV treatment is to eliminate the infection, reduce the transmission to other people and decrease the risk of HCC development.[39]

Hepatitis D

Main article: Hepatitis D

Hepatitis D is caused by the hepatitis D virus (HDV), or hepatitis delta virus; it belongs to the genus Deltavirus. It is similar to a viroid as it can only propagate in the presence of the hepatitis B virus, depending on the helper function of HBV for its replication and expression. It has no independent life cycle, but can survive and replicate as long as HBV infection persists in the host body. It can only cause infection when encapsulated by hepatitis B virus surface antigens.[23][44][45]

Hepatitis E

Hepatitis E virus
Main article: Hepatitis E

Hepatitis E is caused by the Hepatitis E virus (HEV), from the family Hepeviridae; it produces symptoms similar to hepatitis A, although it can take a fulminant course in some patients, particularly pregnant women; chronic infections may occur in immune-compromised patients. It is more prevalent in the Indian subcontinent. The virus is feco-orally transmitted and usually is self-limited.[25][46]

Hepatitis F

Main article: Hepatitis F

Hepatitis F virus (HFV) is a hypothetical virus linked to certain cases of hepatitis. Several hepatitis F virus candidates emerged in the 1990s, but none of these reports have been substantiated.[47][48]

GB virus C

Main article: GB virus C

The GB virus C is another potential viral cause of hepatitis that is probably spread by blood and sexual contact.[49] It was initially identified as Hepatitis G virus.[50] There is very little evidence that this virus causes hepatitis, as it does not appear to replicate primarily in the liver.[51] It is now classified as GB virus C.[52]

Other viruses

Yellow fever virus

The virus first known to cause hepatitis was possibly the yellow fever virus, a mosquito-borne flavivirus.[53] Other viruses than can cause hepatitis include:

KIs-V is a virus isolated in 2011 from four patients with raised serum alanine transferases without other known cause; a causal role is suspected.[66]

Epidemiology

Over 30,000 cases of hepatitis A were reported to the CDC in the US in 1997, but the number has since dropped to less than 2,000 cases reported per year.[67]

See also

References

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  2. 1 2 3 4 5 6 7 8 9 10 11 "What Is Viral Hepatitis?". National Institute of Diabetes and Digestive and Kidney Diseases. NIDDK. Archived from the original on 16 April 2021. Retrieved 8 March 2021.
  3. 1 2 "Hepatitis Testing". medlineplus.gov. Archived from the original on 18 March 2021. Retrieved 8 March 2021.
  4. 1 2 3 4 "Global Viral Hepatitis: Millions of People are Affected | CDC". www.cdc.gov. 10 February 2021. Archived from the original on 2 March 2021. Retrieved 8 March 2021.
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  8. ↑ Kaufman, B; Gandhi, SA; Louie, E; Rizzi, R; Illei, P (March 1997). "Herpes simplex virus hepatitis: case report and review". Clinical infectious diseases : an official publication of the Infectious Diseases Society of America. 24 (3): 334–8. doi:10.1093/clinids/24.3.334. PMID 9114181.
  9. ↑ "Hepatitis C". National Institute of Diabetes and Digestive and Kidney Diseases. NIDDK. Archived from the original on 1 March 2021. Retrieved 8 March 2021.
  10. ↑ "What is Viral Hepatitis?". www.cdc.gov. CDC. 17 February 2021. Archived from the original on 18 March 2021. Retrieved 8 March 2021.
  11. 1 2 3 "Hepatitis B | NIDDK". National Institute of Diabetes and Digestive and Kidney Diseases. Archived from the original on 8 March 2021. Retrieved 15 January 2023.
  12. 1 2 Stanaway, Jeffrey D; Flaxman, Abraham D; Naghavi, Mohsen; Fitzmaurice, Christina; Vos, Theo; Abubakar, Ibrahim; Abu-Raddad, Laith J; Assadi, Reza; Bhala, Neeraj; Cowie, Benjamin; Forouzanfour, Mohammad H; Groeger, Justina; Hanafiah, Khayriyyah Mohd; Jacobsen, Kathryn H; James, Spencer L; MacLachlan, Jennifer; Malekzadeh, Reza; Martin, Natasha K; Mokdad, Ali A; Mokdad, Ali H; Murray, Christopher J L; Plass, Dietrich; Rana, Saleem; Rein, David B; Richardus, Jan Hendrik; Sanabria, Juan; Saylan, Mete; Shahraz, Saeid; So, Samuel; Vlassov, Vasiliy V; Weiderpass, Elisabete; Wiersma, Steven T; Younis, Mustafa; Yu, Chuanhua; El Sayed Zaki, Maysaa; Cooke, Graham S (July 2016). "The global burden of viral hepatitis from 1990 to 2013: findings from the Global Burden of Disease Study 2013". The Lancet. 388 (10049): 1081–8. doi:10.1016/S0140-6736(16)30579-7. PMC 5100695. PMID 27394647.
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