Karst is a type of landscape where the dissolving of the bedrock has created sinkholes, sinking streams, caves, springs, and other characteristic features. Karst is associated with soluble rock types such as limestone, marble, and gypsum.
A: Scientists have identified 5 unique hepatitis viruses, identified by the letters A, B, C, D, and E. While all cause liver disease, they vary in important ways. Hepatitis A virus (HAV) is present in the faeces of infected persons and is most often transmitted through consumption of contaminated water or food.exual transmission is also possible, but is much less common. There is no vaccine for HCV. Hepatitis D virus (HDV) infections occur only in those who are infected with HBV. The dual infection of HDV and HBV can result in a more serious disease and worse outcome.
Hepatitis A is a virus, or infection, that causes liver disease and inflammation of the liver. Viruses can cause sickness. For example, the flu is caused by a virus.People can pass viruses to each other. Inflammation is swelling that occurs when tissues of the body become injured or infected. Hepatitis A is an inflammatory disease of the liver caused by a virus. 2  The liver stores nutrients and vitamins, helps digest foods, helps prevent infections, and helps remove harmful substances from blood. 3  Hepatitis A viruses cause the disease termed hepatitis A.