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.
The cause of hepatitis A is an infection with the hepatitis A virus. The hepatitis A virus is commonly spread by eating or drinking something that has been contaminated with the stool of an infected person. Symptoms are not always present, but when they are, hepatitis A causes stomach pain, sudden fever, nausea, and jaundice, among other things. An Overview of Hepatitis A Causes There is only one cause of hepatitis A-- an infection with the hepatitis A virus (HAV). The hepatitis A virus is an RNA virus that belongs to the genus hepatovirus of the Picornaviridae family.