The health information professional should do nothing about this issue. Giving no clue or telling the diagnosis to no one is the fundamental of ethics consideration for this profession.
During the diagnosis and treatment of HIV infected patients, the doctor convinces patients in many sessions of counseling to bring their sexual partners to check for HIV. To identify and early treatment if the patient’s partners have the disease and also for the disease control.
It’s all about the take-caring physician and patients, not for third parties. You have no right to release this information without the patient’s consent.