Hi, and thank you for your question.
A healthcare provider would not notify a partner that they are at risk of an STI without the express permission of an individual who has tested positive for an STI.
In British Columbia, when an individual tests positive for a reportable STI (chlamydia, gonorrhea, syphilis or HIV) they are responsible for informing their partners so they can also be tested and treated. If an individual does not feel comfortable informing their partners themselves, he or she may give permission for either the testing provider or a public health nurse to inform the partner anonymously on his or her behalf. They may use text message as a way to reach out and contact those partners.
In addition, some sexual health clinics and services offer an online service allowing individuals to notify their partners anonymously through a text message or e-mail from the site.
For more information on partner notification, please visit:   https://smartsexresource.com/topics/partner-notification
Let us know if this does not answer your question or if you have any more questions or concerns.
Health Nurse