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 liver disease caused by the hepatitis A virus. According to the Centers for Disease Control and Prevention (CDC), it is estimated that between 125,000 and 200,000 people are infected with hepatitis A each year in the United States.Between 84,000 to 134,000 of of those people will show symptoms of hepatitis A virus (HAV).ccording to the Centers for Disease Control and Prevention (CDC), it is estimated that between 125,000 and 200,000 people are infected with hepatitis A each year in the United States. Between 84,000 to 134,000 of of those people will show symptoms of hepatitis A virus (HAV).