Other infections can increase HIV viral load.

• Sexually transmitted infections (STIs) including herpes, gonorrhoea and syphilis increase the levels of HIV in semen and vaginal fluids. Higher viral load makes HIV more infectious. This is one reason that other STIs are a risk factor for HIV transmission.
• HIV can also increase the levels of other viruses in someone who has both infections.
• Viral infections like the flu can increase your viral load while the infection is active. If you get a high viral load result when you have flu or a cold, you should retest when you feel better.
• Malaria can increase your viral load while the infection is active.
• Some vaccinations may also increase viral load temporarily.