In Canada, its a crime not to disclose HIV or another STI before having sex that poses a “significant risk of serious bodily harm.” However, most prosecutions have been strictly related to HIV and hardly any have been related to herpes, syphilis, chlamydia or other STIs.

Is it a crime to not tell your partner you have herpes?

There arent any federal or state laws making it illegal for you to not tell a partner about an STD you may have. Laws on the topic vary from state to state. That being said, it is typically illegal, civilly and criminally, to knowingly or recklessly transmit an STD.