Infectious diseases are usually caused by bacteria, viruses, parasites or fungi that spread directly or indirectly from one person to another. The most common infectious diseases are hepatitis B and C, malaria and tuberculosis. If you’re ever exposed to an infectious disease, Valleywise Health is here to meet your unique needs and help you get better as soon as possible. Our goal is to fully and safely treat infectious diseases while minimizing the chance of infecting others.