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https://pridelegal.com/california-hiv-laws/
From 1988 to 2014, 800 HIV confidentiality criminalization cases were prosecuted in California. Out of the 800 cases, none of them required prosecutors to prove that transmission of HIV occurred prior to the defendant being charged. Moreover, all 800 cases ended in a conviction.
https://www.lawyers.com/legal-info/criminal/types-of-crimes/do-you-have-to-tell-your-partner-about-an-std.html
Although jurisdictions define STDs differently, statutes generally include contagious or infectious diseases that are transmitted sexually. Some states list the individual diseases that are covered by the particular law. In those states, the diseases covered typically include the human immunodeficiency virus (โHIVโ), syphilis, gonorrhea, chlamydia, hepatitis, genital herpes, and pelvic inflammatory disease. Other jurisdictions define STDs more generally to include any communicable disease that can be spread from one person to another and thatโs a threat to public health.