This site and any policies described were prepared on the dates listed under each chapter heading and is being made available publicly for educational purposes only, in the context of a public health emergency related to COVID-19 (a.k.a. the coronavirus) and in connection with the state of emergency declared by the Governor of the Commonwealth of Massachusetts and the President of the United States. It is based on pertinent published medical literature, guidelines, and/or expert consensus, which continues to evolve relative to COVID-19. It is neither an attempt to substitute for the practice of medicine nor as a substitute for the provision of any medical professional services. Furthermore, the content is not meant to be complete, exhaustive, or a substitute for medical professional advice, diagnosis, or treatment. The information herein should be adapted to each specific patient based on the treating medical professional’s independent professional judgment and consideration of the patient’s needs, the resources available at the location from where the medical professional services are being provided (e.g., healthcare institution, ambulatory clinic, physician’s office, etc.), and any other unique circumstances. This information should not be used to replace, substitute for, or overrule a qualified medical professional’s judgment. You assume full responsibility for using this information and understand and agree that Mass General Brigham, Partners In Health, the University of California San Francisco and USAID are not responsible or liable for any errors or omissions or for any claim, loss or damage resulting from the use of this information. This website may contain third-party materials and/or links to third-party materials and third-party websites for your information and convenience. Mass General Brigham, Partners In Health, the University of California San Francisco and USAID are not responsible for the availability, accuracy, or content of any of those third-party materials or websites nor does it endorse them. Prior to accessing this information or these third-party websites you may be asked to agree to additional terms and conditions provided by such third parties which govern access to and use of those websites or materials.