Hepatitis B is caused by which type of pathogen?

Hepatitis B is primarily caused by a virus, specifically the hepatitis B virus (HBV). This type of pathogen is known for its ability to infect liver cells and lead to inflammation, which can result in various health issues such as liver damage, cirrhosis, and even liver cancer if not managed properly. Viruses like HBV are unique because they require a host cell to replicate, differentiating them from bacteria, fungi, and parasites, which can often survive and reproduce independently. Understanding the viral nature of hepatitis B is crucial for implementing appropriate preventive measures, such as vaccination and awareness of transmission routes, which primarily occur through contact with infectious body fluids.