Which hepatitis virus is primarily transmitted through sexual contact and blood transfusion?

The hepatitis virus primarily transmitted through sexual contact and blood transfusion is Hepatitis B. This virus is known for its ability to spread through various routes, with sexual contact being a significant mode of transmission. Hepatitis B is present in bodily fluids such as blood, semen, and vaginal secretions, making sexual activity a common means of infection.

Moreover, Hepatitis B can also be transmitted through blood transfusions, particularly if contaminated blood is transfused. This transmission route was more prevalent before the rigorous screening of blood products began in the late 20th century.

It’s important to recognize the disease's consequences, as chronic Hepatitis B infection can lead to severe liver problems, including cirrhosis and liver cancer, requiring vigilant screening and monitoring. These factors underline the importance of understanding Hepatitis B's transmission routes in both clinical and public health contexts.