Final answer:
Genital herpes caused by HSV and genital warts caused by HPV are incurable but treatable STIs like HIV. Bacterial STIs are generally curable with antibiotics, but viral STIs can often only be managed, not cured.
Step-by-step explanation:
The second kind of STI that is incurable, but treatable like HIV is genital herpes, which is caused by the herpes simplex virus (HSV). Another viral STI that is treatable but not curable is infection by the human papillomavirus (HPV), which can lead to genital warts. While bacterial STIs can typically be cured with antibiotics, viral STIs cannot, although the symptoms may be managed with antiviral drugs. Prevention of viral STIs includes vaccines for some but not all viruses, such as HPV. For viral STIs that do not have vaccines, practicing safe sex behaviors and proper condom use can greatly reduce the risk of transmission.