Hepatitis

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PRESENTATION BY FARHAN AND RIDHWAN-4 SIGMA 2009

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Hepatitis

  1. 2. <ul><li>is an infectious disease affecting the liver , caused by the hepatitis C virus (HCV). [1] The infection is often asymptomatic , but once established, chronic infection can progress to scarring of the liver ( fibrosis ), and advanced scarring ( cirrhosis ) which is generally apparent after many years. In some cases, those with cirrhosis will go on to develop liver failure or other complications of cirrhosis, including liver cancer . [1] </li></ul>
  2. 3. <ul><li>The hepatitis C virus (HCV) is spread by blood-to-blood contact. Most people have few, if any symptoms after the initial infection, yet the virus persists in the liver in about 85% of those infected 51% are cured overall. Those who develop cirrhosis or liver cancer may require a liver transplant , and the virus universally recurs after transplantation. </li></ul>
  3. 4. <ul><li>An estimated 270-300 million people worldwide are infected with hepatitis C. Hepatitis C is a strictly human disease. It cannot be contracted from or given to any animal. Chimpanzees can be infected with the virus in the laboratory, but do not develop the disease, which has made research more difficult. No vaccine against hepatitis C is available. </li></ul>
  4. 5. <ul><li>The Hepatitis C virus (HCV) is a small (50 nm in size), enveloped, single-stranded, positive sense RNA virus . It is the only known member of the hepacivirus genus in the family Flaviviridae . There are six major genotypes of the hepatitis C virus, which are indicated numerically (e.g., genotype 1, genotype 2, etc.). </li></ul>
  5. 6. <ul><li>The hepatitis C virus (HCV) is transmitted by blood-to-blood contact. In developed countries, it is estimated that 90% of persons with chronic HCV infection were infected through transfusion of unscreened blood or blood products or via injecting drug use or sexual exposure. </li></ul>
  6. 7. <ul><li>Although injection drug use is the most common routes of HCV infection, any practice, activity, or situation that involves blood-to-blood exposure can potentially be a source of HCV infection. The virus may be sexually transmitted , although this is rare. </li></ul>
  7. 8. <ul><li>Sexual activities and practices were initially identified as potential sources of exposure to the hepatitis C virus. More recent studies question this route of transmission. Currently it is felt to be a means of rare transmission of hepatitis C infection. </li></ul>
  8. 9. <ul><li>Injection drug use Those who currently use or have used drug injection as their delivery route for drugs are at increased risk for getting hepatitis C because they may be sharing needles or other drug paraphernalia (includes cookers, cotton, spoons, water, etc.), which may be contaminated with HCV-infected blood. </li></ul>
  9. 10. <ul><li>Blood products Blood transfusion , blood products, or organ transplantation prior to implementation of HCV screening (in the U.S., this would refer to procedures prior to 1992) is a decreasing risk factor for hepatitis C. </li></ul>
  10. 11. <ul><li>People can be exposed to HCV via inadequately or improperly sterilized medical or dental equipment. Equipment that may harbor contaminated blood if improperly sterilized includes needles or syringes, hemodialysis equipment, oral hygiene instruments, and jet air guns, etc. </li></ul>
  11. 12. <ul><li>Occupational exposure to blood Medical and dental personnel, first responders (e.g., firefighters , paramedics , emergency medical technicians , law enforcement officers ), and military combat personnel can be exposed to HCV through accidental exposure to blood through accidental needlesticks or blood spatter to the eyes or open wounds. </li></ul>
  12. 13. <ul><li>Sexual transmission of HCV is considered to be rare. Studies show the risk of sexual transmission in heterosexual, monogamous relationships is extremely rare or even null.The CDC does not recommend the use of condoms between long-term monogamous discordant couples (where one partner is positive and the other is negative). </li></ul>
  13. 14. <ul><li>Body piercings and tattoos Tattooing dyes, ink pots, stylets and piercing implements can transmit HCV-infected blood from one person to another if proper sterilization techniques are not </li></ul>
  14. 15. <ul><li>Shared Personal care items such as razors, toothbrushes, cuticle scissors, and other manicuring or pedicuring equipment can easily be contaminated with blood. Sharing such items can potentially lead to exposure to HCV. </li></ul><ul><li>HCV is not spread through casual contact such as hugging, kissing, or sharing eating or cooking utensils. </li></ul>
  15. 16. <ul><li>There is a very small chance of clearing the virus spontaneously in chronic HCV carriers (0.5 to 0.74% per year), [21][22] however, the majority of patients with chronic hepatitis C will not clear it without treatment. </li></ul>
  16. 17. <ul><li>If a woman who is pregnant has risk factors for hepatitis C, she should be tested for antibodies against HCV. </li></ul><ul><li>In a mother who also has HIV, the rate of transmission can be as high as 19%. </li></ul>
  17. 18. <ul><li>HCV antibodies from the mother may persist in infants until 15 months of age. If an early diagnosis is desired, testing for HCV RNA can be performed between the ages of 2 and 6 months, with a repeat test done independent of the first test result. If a later diagnosis is preferred, an anti-HCV test can performed after 15 months of age. Most infants infected with HCV at the time of birth have no symptoms and do well during childhood </li></ul>
  18. 19. <ul><li>According to Centers for Disease Control, hepatitis C virus is spread by exposure to large quantities of blood, either through the skin or by injection: [43] </li></ul><ul><li>Injection drug use (currently the most common means of HCV transmission in the United States) </li></ul><ul><li>Receipt of donated blood, blood products, and organs (once a common means of transmission but now rare in the United States since blood screening became available in 1992) </li></ul><ul><li>Needlestick injuries in healthcare settings </li></ul><ul><li>Birth to an HCV-infected mother </li></ul>
  19. 20. <ul><li>HCV can also be spread infrequently through </li></ul><ul><li>Sex with an HCV-infected person (an inefficient means of transmission) </li></ul><ul><li>Sharing personal items contaminated with infectious blood, such as razors or toothbrushes (also inefficient vectors of transmission) </li></ul><ul><li>Other healthcare procedures that involve invasive procedures, such as injections (usually recognized in the context of outbreaks) </li></ul><ul><li>Proponents of harm reduction believe that strategies such as the provision of new needles and syringes, and education about safer drug injection procedures, greatly decreases the risk of hepatitis C spreading between injecting drug users. </li></ul><ul><li>No vaccine protects against contracting hepatitis C, or helps to treat it. Vaccines are under development and some have shown encouraging results. [44] </li></ul>

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