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Capt. Sherteria Scott-Brown, left, of the 908th Airlift Wing's Aeromedical Staging Squadron, and Lt. Colonel Donna Roberts inspect the expiration dates on a shipment of Hepatitis B vaccine. Those preparing to deploy should take precautions to protect against the three strains of the disease. According to the World Health Organization, nearly one third of the world's population, more than 2 billion people, have been infected with the Hepatitis B virus. Hepatitis C is transmitted by blood-to-blood contact. Chronic infection can cause inflammation of the liver, which can progress to scarring of the liver. In some cases, liver failure or liver cancer can develop.