Hepatitis A (HAV), or infectious hepatitis, is an acute disease of the liver caused by the hepatitis A virus. It is mostly spread by food or drink contaminated with faeces. People infected have often travelled to parts of the world where hygiene is poor. In many cases, there is no illness or a flu-like illness with mild jaundice and does not progress to chronic hepatitis. Unlike hepatitis B and hepatitis C, HAV does not cause chronic (ongoing, long-term) disease. Although the liver does become inflamed and swollen, it heals completely in most people without any long-term damage. Once you have had HAV, you develop lifelong immunity and cannot get the disease again.