The Infectious Diseases Society of America (IDSA) is a medical association representing physicians, scientists, and other health care professionals who specialize in infectious diseases. It was founded in 1963 and is based in Arlington, Virginia. As of 2023, IDSA had more than 13,000 members from across the United States and nearly 100 other countries on six different continents. IDSA's purpose is to improve the health of individuals, communities, and society by promoting excellence in patient care, education, research, public health, and prevention relating to infectious diseases. It is a 501(c)(6) organization.