2/3/2025: The guidelines on this website include links to materials on U.S. government websites, including guidelines from HHS, CDC, and SAMHSA. On 1/31/2025, the U.S. government took thousands of web pages offline; as a result, links in the guidelines and other materials on this website may open pages marked as unavailable. The Clinical Guidelines Program is monitoring the situation, will make adjustments as needed, and will add supplementary materials as possible. New York State clinicians with specific clinical inquiries regarding HIV, sexual health, viral hepatitis, or drug user health, can contact the CEI line at 866-637-2342.