Which virus is primarily responsible for causing Hepatitis B?

The Hepatitis B virus is the primary culprit in causing Hepatitis B. This virus is a highly infectious agent that primarily affects the liver, leading to inflammation and potentially serious health issues like liver cirrhosis and liver cancer if not effectively managed. Hepatitis B is transmitted through contact with infectious body fluids, such as blood, making understanding this specific virus essential for prevention and treatment.

The other viruses listed, while they are significant in their own right, do not cause Hepatitis B. The Human Immunodeficiency Virus (HIV) primarily attacks the immune system, Cytomegalovirus can cause various diseases particularly in immunocompromised individuals, and Hepatitis A virus, while also a liver infecting virus, leads to a different form of hepatitis that is typically self-limiting and not transmitted in the same manner as Hepatitis B. Understanding the specific viruses and their effects on human health is vital for proper diagnosis and treatment in direct care settings.