HIV today: the answer first
HIV is a manageable long-term condition. Someone living with HIV who is on effective treatment and maintains an undetectable viral load cannot pass HIV to a sexual partner. This is U=U: undetectable equals untransmittable. It is a clear scientific statement, not a polite way of describing a small remaining risk. The NHS HIV information explains that treatment allows most people with HIV to live a long and healthy life.
This guide is for adults aged 18 and over. It focuses on relationships, understanding treatment and getting appropriate UK support. PrEP is prevention before a possible exposure; PEP is emergency assessment and treatment after one. Neither is a substitute for an individual clinical assessment. If a possible HIV exposure happened within the last 72 hours, seek a sexual health clinic or A&E urgently rather than waiting to finish reading.
What undetectable means
Viral load describes the amount of HIV measured in blood. HIV treatment suppresses the virus; an undetectable result means it is below the relevant laboratory measurement threshold. Undetectable does not mean that HIV has disappeared or been cured. Ask the clinic which test is being discussed and what the result means for your care. Use the explanation from Terrence Higgins Trust on viral load rather than interpreting somebody’s results yourself.
U=U depends on effective treatment and maintaining viral suppression, with regular monitoring by an HIV team. Do not assume it applies immediately after a diagnosis or the first prescription. If treatment has been interrupted or there is uncertainty about a result, the HIV clinic can explain the current position and any temporary precautions. A partner should offer support with appointments or access difficulties without taking control of another adult’s treatment.
U=U in an adult relationship
For a couple whose partner living with HIV has a maintained undetectable viral load, there is no sexual HIV transmission risk from that partner. That applies regardless of gender or sexual orientation. Avoid language such as clean, dirty or dangerous to describe someone’s status. It replaces a medical fact with a moral judgement and makes honest conversations harder. Negative messages about HIV can also affect how someone feels about themselves.
BHIVA’s sexual-health standards distinguish HIV prevention from other needs. U=U does not prevent another sexually transmitted infection or pregnancy. Decisions about contraception, barriers and testing should therefore cover those separate needs. Nobody has to stop using condoms because U=U applies, and nobody should be pressured into contact by being told their concerns are irrational. Respect for consent includes agreeing what protection each person wants and accepting that a boundary can remain even after a reassuring health conversation.
PrEP: ask a sexual health clinic
Pre-exposure prophylaxis, or PrEP, is medicine used by a person without HIV to reduce their chance of acquiring it. The NHS PrEP overview describes access through NHS sexual health clinics and makes clear that PrEP does not protect against other STIs. It is not a treatment plan for someone already diagnosed with HIV. Clinic assessment should consider the person’s actual circumstances rather than assumptions based on identity.
Ask the clinic whether PrEP is appropriate, what tests are needed, how follow-up works and whom to contact if circumstances change. Explain other medicines, kidney or liver problems, hepatitis and pregnancy or breastfeeding where relevant; the NHS suitability information identifies these as matters to discuss. This page does not give doses or a schedule. Borrowing a partner’s tablets or copying somebody else’s regime bypasses that assessment.
If your only potential HIV exposure is sex with a partner whose HIV is effectively suppressed, PrEP may not be necessary for that exposure. Other partners or uncertainties may change the discussion. NHS access is through local services, so check the appointment arrangements where you live rather than assuming every clinic has the same pathway. The existing PrEP, PEP and combination-prevention guide covers how different prevention measures fit together.
PEP: an urgent route after possible exposure
Post-exposure prophylaxis, or PEP, is an emergency clinical option after a possible HIV exposure. The NHS advises attending a sexual health clinic or A&E if you think an exposure occurred in the last 72 hours. Seek help as soon as possible; do not wait for symptoms, a home test or an appointment several days away. Staff assess what happened, whether PEP is appropriate and what other care is needed. A request for assessment is not a diagnosis.
Tell the clinician the timing and relevant circumstances as accurately as you can. If more than 72 hours have passed, contact a sexual health clinic or GP for testing and advice instead of assuming nothing can be done. Where U=U is established, HIV cannot be passed sexually from that partner; uncertainty should be resolved with a clinician rather than through panic or accusations. Emergency contraception and other STI assessment may involve separate decisions.
Testing without turning it into a character test
HIV can be present without obvious symptoms. Feeling well, knowing someone socially or being in a long relationship does not establish a test result. NHS testing advice distinguishes an initial result from confirmation and notes that another test may be needed after a recent exposure. Ask when your particular test can give a reliable answer and whether a repeat is needed. A negative result obtained too early should not be treated as proof about a later exposure.
A positive screening result needs clinical confirmation and support. Allow time for questions rather than demanding an instant account of when or how someone acquired HIV. For wider testing arrangements, use STI testing windows and partner notification and the glossary explanation of testing windows. Clinics can help contact partners confidentially where notification is needed, which can be especially useful if direct contact feels unsafe or distressing.
Disclosure, privacy and dating
Sharing an HIV diagnosis can involve trust, vulnerability and practical support. A person may want to explain U=U, bring an official information page to a conversation or ask their clinic about a joint appointment. Terrence Higgins Trust’s partner information discusses these choices and clinic help with partner notification. Choose a setting with time and privacy; a date should not become an interrogation or a demand to display a medical record.
This is not a statement of disclosure law across the four UK nations. If a particular situation raises a legal concern, seek current specialist advice rather than drawing a conclusion from a dating profile or a short online comment. Keep health disclosure separate from permission for any activity. The existing guide to sensitive partner conversations can help with pacing, listening and accepting an answer.
Agree who may know, how messages are handled and whether any shared document contains identifying health information. Do not screenshot a disclosure, share it with friends or publish someone’s status without their agreement. Being told confidential information does not make it yours to circulate. If a partner threatens to reveal it, pause the relationship discussion and seek support; privacy should never become leverage to secure contact, money or compliance.
Recognising stigma and making room for ordinary life
HIV stigma can include hostility, exclusion, assumptions about behaviour and shame directed inward. Terrence Higgins Trust’s stigma guidance describes these problems and support options. The UKHSA report on the Positive Voices survey also shows why good treatment access does not make stigma disappear. No survey finding tells you what an individual will feel or need.
A supportive partner can learn current facts, challenge insulting language and make room for an ordinary relationship beyond health discussions. Ask what support would be welcome instead of assuming someone needs supervision or reassurance every day. If anxiety about HIV repeatedly prevents dating or intimacy despite accurate information, discuss that anxiety with a professional. Someone living with HIV should not have to provide endless proof or unpaid counselling to earn respect.
Is it illegal to pass on HIV in the UK?
In England and Wales, reckless HIV transmission can amount to grievous bodily harm under section 20 of the Offences Against the Person Act 1861, which remains in force. R v Dica (2004) established that the offence can cover sexual transmission, while informed consent to the risk can be a defence to reckless transmission. R v Konzani (2005) clarified the distinction between agreeing to sex and giving informed consent to that specific risk. Neither case makes living with HIV a crime. These are England and Wales decisions, not a single rule for every UK nation.
The CPS transmission guidance distinguishes intentional transmission, potentially under section 18, from reckless transmission under section 20. A prosecution requires proof of the relevant harm, knowledge, state of mind and actual transmission. Investigators must rule out other possible sources; a genetic match alone cannot establish who infected whom. These demanding evidential requirements help explain why a diagnosis or allegation does not automatically become a prosecution. The guidance does not provide a current UK-wide prosecution count, so no numerical claim is made here.
Effective treatment and condoms matter to the CPS assessment of reasonable safeguards. Its guidance recognises an undetectable viral load as an appropriate safeguard, including where condoms were not used. Appropriate precautions supported by expert evidence can make recklessness very difficult to prove. This is consistent with the U=U information above; it is not a reason to stop treatment or replace clinical advice with a legal checklist.
Scotland has a separate COPFS prosecution policy, using assault or culpable and reckless conduct. It reports very few prosecutions and considers exposure without transmission only exceptionally. Treatment, medical advice and reasonable precautions are relevant to its assessment. Northern Ireland requires its own legal advice; the CPS and COPFS policies must not be presented as its prosecution guidance. Law and guidance checked on 9 October 2026.
For an allegation or police contact, seek a criminal solicitor in the correct nation. Free police-station legal advice and Find a Solicitor provide England and Wales routes; UK help links to nation-specific services. This is legal information, not advice on an individual case. Continue to use the HIV clinic for treatment and prevention support.
Common questions
Does U=U mean HIV is cured? No. Treatment suppresses HIV, and ongoing clinical care maintains and monitors that suppression. A cure and an undetectable viral load are different things.
Can I get HIV from kissing or sharing household items? The NHS says HIV is not transmitted through kissing, hugging or ordinary shared household items. Everyday closeness does not need to become an infection-control ritual.
Do I still need STI testing while taking PrEP? Yes, discuss a testing plan with the clinic. PrEP addresses HIV, not all other infections, and follow-up is part of care.
Should I wait for symptoms before asking about PEP? No. Seek urgent assessment after a possible exposure within 72 hours. Symptoms are neither necessary nor a reliable way to decide.
Can partners with different HIV statuses date? Yes. Accurate information, effective treatment where relevant and respectful communication allow a relationship to be considered without treating HIV status as a verdict on compatibility.
UK help
For possible HIV exposure within 72 hours, contact an NHS sexual health clinic urgently or attend A&E. For testing, PrEP assessment or a new diagnosis, use your local clinic; the NHS HIV page links to a clinic finder. People already in HIV care can contact their specialist team about viral load, medicine access, side effects or treatment interruptions.
Terrence Higgins Trust provides HIV information and support through THT Direct on 0808 802 1221, as listed by the NHS. Ask about emotional support, partner conversations and services in your area. A GP or HIV team can help if distress is persistent or affecting daily life. For immediate danger or a life-threatening emergency, call 999. Support is appropriate whether the concern is medical, emotional or a partner’s threatening behaviour.