Early HIV infection is the time just after someone has been exposed to HIV. It is also called acute or primary HIV infection.
During this stage, HIV spreads quickly in the body. The immune system is still learning how to respond, so the virus can reach high levels in the blood.
Some people may feel unwell during this time, but others may have no symptoms at all.

What symptoms might occur?
When symptoms do happen, they can feel like a strong flu. This may include:

• fever
• sore throat
• swollen glands
• tiredness
• body aches
• rash
• mouth ulcers

These symptoms are sometimes called seroconversion illness. Seroconversion is when the body starts making antibodies to respond to HIV for the first time.
Not everyone experiences symptoms, so testing is the only way to know your HIV status.

Why early infection matters
During early infection:

• HIV levels in the body are very high
• the immune system is under pressure
• there is a higher chance of passing HIV on to others

This is why prevention methods like condoms or PrEP are important if there has been a recent exposure.

Testing for HIV after recent exposure
Different HIV tests work in different ways:

• Laboratory antigen/antibody tests are the most accurate for recent infection. They can usually detect HIV within a few weeks.
• Rapid tests and self-tests are quicker but may not detect very recent infection.
• If a test is taken too early, it may show a false negative, even if HIV is present.

If there is a recent possible exposure (within 72 hours), a doctor may also discuss PEP (post-exposure prophylaxis), which can help prevent HIV from taking hold.

Starting treatment early
If someone is diagnosed with HIV during early infection, they are usually offered HIV treatment (ART) straight away.
Starting treatment early can:

• protect the immune system
• reduce illness
• help the body recover faster
• lower the chance of passing HIV to others

Over time, effective treatment can reduce the virus to an undetectable level, which means it cannot be passed on sexually.

Key Message
Early HIV infection is a time when the body is most affected by the virus, but it is also a time when early testing and treatment can make a big difference.
With the right care, people living with HIV can protect their health, start treatment early, and stay well long term.
For more information: aidsmap.com/about-hiv/early-hiv-infection
pozhet.org.au/hiv-prevention/testing-options/