The Mendocino County Board of Supervisors is reporting a rise in HIV and syphilis cases. Two-dozen syphilis cases have been confirmed in the county in the past five months. The case rate is on pace to exceed that of 2023, when 53 syphilis cases were recorded. The number of HIV infections in Mendocino County has also increased 100 percent in the first five months of the year. Officials are not announcing the exact number of cases, due to privacy concerns.