IDSA is an acronym for Infectious Diseases Society of America. The IDSA is a medical association representing physicians, scientists and other health care professionals who specialize in infectious diseases. IDSA's purpose is to improve health of individuals, communities and society by promoting excellence in patient care, education, research, public health and prevention relating to infectious diseases.

The IDSA recommends against long-term antibiotic therapy for Lyme disease. Patient organisations feel that the IDSA guidelines on the treatment of Lyme disease deny further care for patients that remain ill after antibiotic therapy.