Can You Give Blood If You Have Herpes
, by Andrew Odgers, 9 min reading time
Eligibility
Can you give blood if you have herpes?
Yes, in most circumstances. Having herpes simplex virus (HSV-1 or HSV-2) does not prevent you from giving blood in the UK. HSV is not transmitted through blood transfusion, is not tested for in donated blood and is not a reason for permanent deferral. The only restriction applies during an active outbreak: you should postpone your donation until the episode has fully resolved and you feel well. Between outbreaks, donors with herpes give blood without restriction.
Why herpes is not a barrier
HSV and blood donation: the facts
How herpes is and is not transmitted
Herpes simplex virus is transmitted through direct skin-to-skin contact with an infected area, typically during or just before an active outbreak when the virus is shedding at the skin surface. It does not circulate in the bloodstream in the way that blood-borne viruses such as HIV or hepatitis C do.
Because HSV is not a blood-borne pathogen in the clinical sense, it cannot be transmitted through a blood transfusion from a donor who has the virus. This is why blood donation screening in the UK does not test for HSV and why NHS Blood and Transplant does not list herpes as a deferral condition.
Active outbreaks and when to postpone
The one situation where you should not donate is during an active outbreak of herpes, whether oral (cold sores) or genital. An active outbreak means your immune system is responding to viral replication at the surface of your skin. You may not feel entirely well, and the requirement to feel well on the day of donation applies regardless of the specific cause.
Once the outbreak has completely resolved, all lesions have fully healed and you feel your normal self, you can donate. There is no fixed minimum waiting period after an outbreak beyond genuine clinical recovery. When the visible signs are gone and you feel well, you are eligible.
Cold sores and oral herpes
Oral herpes caused by HSV-1 is extremely common and follows the same donation rules. A donor who has had a cold sore in the past but currently has no active lesion can give blood without any restriction. A donor with an active cold sore, whether in the blister, weeping or crusting stage, should wait until it has completely healed before attending an appointment.
An active cold sore is often accompanied by a mild sense of being below par, a tingling sensation or slight fatigue. These alone are reason to postpone, independent of the visible lesion.
Antiviral medication and donation
Common antiviral medications prescribed for herpes management, including aciclovir (Zovirax), valaciclovir (Valtrex) and famciclovir, are all compatible with blood donation. These medications do not prevent donation and do not affect the usability of donated blood.
Declare all medications on the health questionnaire at your appointment. Staff will cross-reference them against the NHS medication guidance and confirm there are no concerns. Suppressive antiviral therapy taken daily to reduce outbreak frequency does not change your eligibility status.
No disclosure required between outbreaks
Because herpes does not affect the safety of donated blood, you are not required to disclose your HSV diagnosis to donation staff when you have no active outbreak. The health questionnaire asks whether you feel well on the day and about any recent symptoms or infections. If you have no active symptoms, herpes does not require specific disclosure.
If you do have an active or recently resolved outbreak, declare this at your appointment. Staff will assess whether you have recovered sufficiently to proceed and will advise you on the appropriate timing if they feel more recovery time is needed.
Ready to donate
Between outbreaks, your donation is needed
Herpes is one of the most common conditions in the UK adult population and does not prevent the vast majority of affected donors from giving blood. Book when you are well and symptom-free.
When to seek advice before donating
Situations where GP input is worth seeking before donating with HSV
Most donors with herpes attend and donate without any complication. Consider speaking to your GP before donating if any of the following apply.
- You are experiencing very frequent outbreaks, more than six per year. This level of viral activity may indicate your immune system is under persistent stress that warrants a broader medical review.
- You are immunocompromised for any reason. Conditions or medications that suppress immune function change how your body manages HSV and may affect your overall fitness to donate.
- Your most recent outbreak has not fully resolved. Wait until every lesion is healed, all symptoms have cleared and you feel entirely your normal self before attending.
- You have recently started a new antiviral medication. Give yourself time to establish how the medication affects your wellbeing before adding the mild stress of donation.
Herpes is among the most common infections in the adult population and is very well understood by the NHS. Between outbreaks, donors with HSV contribute to the blood supply safely and are very much welcomed. Do not let a herpes diagnosis put you off donating.
Our Can I give blood guide covers the complete eligibility framework for all donors, including those with pre-existing conditions.
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This article is part of our complete giving blood knowledge base, covering eligibility, preparation, what happens on the day, recovery, types of donation and the science of why blood is so urgently needed.
Keep reading
Eligibility and medication guides
Can I give blood covers the full eligibility picture. Can you give blood if you are on medication covers antiviral drugs and donation compatibility. And Who can give blood and who cannot covers every NHS deferral category in one place.
Frequently asked
Herpes and blood donation questions
Does having herpes mean I cannot give blood?
No. HSV is not transmitted through blood transfusion and is not a reason for deferral. You can give blood freely between outbreaks. The only restriction is during an active episode, at which point you should postpone until fully recovered.
Do I have to tell the donation team I have herpes?
Not if you have no active outbreak or recent symptoms. The questionnaire asks whether you feel well on the day. You do not need to disclose your diagnosis when you are between outbreaks and feeling entirely well.
Can I donate if I had a cold sore two weeks ago?
Yes, provided the cold sore has completely healed and you feel entirely well. There is no fixed minimum waiting period beyond genuine clinical recovery. When the site is fully healed and you feel normal, you are eligible.
Can I give blood while taking aciclovir every day?
Yes. Daily suppressive aciclovir therapy is compatible with blood donation. Declare it on your questionnaire at each appointment and staff will confirm there are no concerns.
Is HSV-2 treated differently from HSV-1 for donation purposes?
No. Both types follow identical rules. The relevant question in both cases is whether you have an active outbreak on the day of your appointment, not which type of HSV you have.
Can I donate if I have been diagnosed with herpes but have never had a visible outbreak?
Yes. Asymptomatic HSV carriage is not a barrier to donation. You are not required to disclose it and it does not affect your eligibility in any way.