To avoid the spread of the virus, HIV serodiscordant couples should ensure the HIV-positive partner adheres to Antiretroviral Therapy (ART) to achieve an undetectable viral load, which means the virus cannot be transmitted (U=U). The HIV-negative partner can take Pre-Exposure Prophylaxis (PrEP) to prevent infection. Consistent and correct use of condoms during sexual activity also significantly reduces risk, alongside regular HIV testing and open communication within the relationship. That's 2 down. 3 left today — send the next one.