References UK clinical guidance from the NHS, the British HIV Association (BHIVA), and the British Association for Sexual Health and HIV (BASHH). Last updated: April 2026.
Flu tends to be more severe in people living with HIV. That’s true even when you’re on effective treatment with an undetectable viral load. The good news is that the annual flu vaccine is safe, free on the NHS for anyone with HIV, and significantly reduces your risk of hospital admission.
Here’s what you need to know about flu risk, vaccination and what to do if you get sick.
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Why Is Flu Worse with HIV?
Even with a well-controlled HIV infection, your immune system is working harder than someone who is HIV-negative. This means:
- Flu symptoms can last longer
- You’re more likely to develop secondary bacterial pneumonia
- Hospital admission rates are higher
- Recovery tends to take longer
The risk is highest if your CD4 count is below 200 or your viral load is detectable.
The NHS Flu Vaccine
Anyone living with HIV in the UK is eligible for a free NHS flu vaccine every autumn, regardless of age or CD4 count. The vaccine is safe and does not interact with antiretroviral therapy.
| Vaccine Type | Suitable with HIV? |
|---|---|
| Inactivated injectable (standard NHS flu jab) | Yes — recommended |
| High-dose or adjuvanted vaccine | Yes if offered (often for 65+) |
| Live attenuated nasal spray | Not recommended if CD4 < 200 or immunosuppressed |
You can get the vaccine at your GP, HIV clinic, or most community pharmacies.
Symptoms and When to Seek Help
Classic flu symptoms include:
- High fever and chills
- Body aches
- Headache
- Dry cough
- Fatigue and weakness
- Sore throat
Contact your HIV team or GP if you:
- Have difficulty breathing or chest pain
- Cannot keep fluids down
- Have symptoms that last more than a week without improving
- Develop a cough with blood or thick yellow/green phlegm
Oseltamivir (Tamiflu) may be recommended for people with HIV who catch flu, especially if started within 48 hours of symptom onset. Talk to your HIV team or GP — don’t wait for a phone appointment if you’re getting worse.
Read more: Lung problems and HIV | What is HIV?
Frequently Asked Questions
Is the flu jab safe with HIV medication?
Yes. The inactivated flu vaccine is safe with all HIV medications and does not affect viral load or CD4 count in any clinically important way.
Can I have the nasal spray flu vaccine?
Only if your CD4 count is above 200 and you are not significantly immunosuppressed. The injectable vaccine is preferred for most people living with HIV.
Will flu make my HIV worse?
A short illness like flu can temporarily raise your viral load in some cases, but it usually returns to normal once you recover. Staying on your HIV treatment throughout the illness is important.
Related reading
- A to Z of Sex: Sexual Health Terms Explained
- Alcohol and HIV: What You Need to Know
- Anxiety and HIV: Coping and Getting Support
- Are All STIs Curable?
- Blood Problems and HIV: Anaemia, Low Platelets and More
Sources
- NHS — Sexual health conditions
- BASHH — UK clinical guidelines for STI management
- British HIV Association (BHIVA) — HIV treatment guidelines
- Terrence Higgins Trust — sexual health information
- UK Health Security Agency — STI surveillance data
Steve Page is a recognised expert on Sexually Transmitted Diseases (STDs) and STD treatments, having published numerous articles in peer-reviewed journals and presented his research at conferences around the world. He has an in-depth understanding of the latest medical research on STDs, and is an advocate for the development of new treatments and protocols to improve the health of those affected. In addition to his research, he has dedicated his career to understanding the causes and symptoms of STDs, as well as how to best treat those impacted.
