TORONTO — The war against the “viral time bomb†Hepatitis C virus (HCV), an infection that afflicts nearly 180 million worldwide, has become clinically imperative. The U.S. Centers for Disease Control – and its counterpart in Canada, the Public Health Agency — recommend that home health care providers and health care workers use latex gloves, wash their hands regularly and sterilize instruments to reduce the risk of spreading HCV, which can cause liver cancer and cirrhosis of the liver. Experts, including Dr. Tom Wong, Center for Infectious Disease Prevention and Control, Public Health Agency of Canada, also advise infected patients not to donate blood, organs, tissues or semen, or share sharp items potentially contaminated with blood — e.g., razors, nail clippers, scissorsand toothbrushes. As no laboratory parameters definitively predict which persons infected with HCV will develop cirrhosis or will respond to medical therapy, according to the National Institutes of Health, prevention has become the key to successful management.Â
Like HIV/AIDS, HCV is, at this stage, more concentrated among specific vulnerable populations including injecting drug users (IDUs), and those who received blood transfusions, including those who regularly undergo dialysis, says Stefan Beral, a medical doctor and epidemiologist at the Center for Public Health and Human Rights, Department of Epidemiology, Johns Hopkins School of Public Health, Baltimore.Â
Recent global estimates, released this fall, by the London School of Tropical Medicine indicate that at least 50% of all IDUs in 49 countries or territories had HCV infection. As a result of this, the U.S. Food and Drug Administration is now requiring blood collecting establishments to “quarantine†blood and blood components from HCV infected donors, and to appropriately notify consignees of such infected materials.  According to the CDC estimates, injection drug use accounts for 60% of all new cases of hepatitis C in the country that is home to nearly 3.2 million chronic cases of the 4.1 million infected individuals. And, there is increasing evidence of transmission relatively efficiently through male sexual contact, says Dr. Beral. As nearly 70% of all new infections progress toward chronic hepatitis, 10% to 20% develop cirrhosis, and up to 5% end up in liver cancer and death over a period of two to three decades. HCV accounts for 50% to 76% of all liver cancer cases, and a majority of all liver transplants in the developed nations. In the U.S. alone, of the 18,000 Americans waiting for a transplant, an estimated 40% to 60% have Hepatitis C.  Prevention, through good sanitation, and cleanliness, is the best measure. That’s because the treatment needed—pegylated interferon-alpha and ribavirin combination—to rid the body of the virus generally takes a full year of therapy. Thus, most people fail because of the toxicity, intensity and duration of care, laments Dr. Beral. “Cure is not a guarantee with success in approximately 60%-80% of the cases, depending on which serotype of virus that you have.â€Â One of the most promising new drugs in development for treatment of chronic HCV is Telaprevir (VX-950), an inhibitor of HCV protease, reported at the 47th Annual Interscience Conference on Antimicrobial Agents and Chemotherapy (ICAAC) in Chicago last September. –by Sridhar Nadamuni, Toronto CorrespondentÂ
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Posted: November 26th, 2007 under Feature Stories, Hepatitis.
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