Vaccines and antibiotics after splenectomy with pancreatic surgery – what patients need to know

For patients, families, and GP teams. From the team behind prehabforsurgery.com

If you have had – or are about to have – a distal pancreatectomy, a total pancreatectomy, or occasionally another HPB operation that involves removing the spleen, this article is for you. Living without a spleen, or with a spleen that no longer works properly, carries a small but real lifelong risk of severe infection. The risk is greatly reduced – but not eliminated – by the right vaccines at the right time, by sensible antibiotic precautions, and by knowing what to do if you get unwell.

Most patients who lose their spleen are told this once, in the early post-operative period, when there is a lot of other information to absorb. Five years later, when a booster vaccine is due or a holiday is being planned or a dog bite happens, the original advice has often been forgotten. This article is the practical reminder.

Why the spleen matters – and what changes when it is gone

The spleen is a fist-sized organ in the left upper abdomen, just behind the stomach and directly in front of the tail of the pancreas. It does several jobs at once: it filters old red blood cells out of the blood, it stores platelets, and – crucially for this article – it is a key part of the immune system’s defence against certain bacteria, particularly those that have a polysaccharide capsule (a sugar coat that hides them from the rest of the immune system).

Without a functioning spleen, the body’s ability to clear these specific encapsulated organisms from the bloodstream is greatly reduced. The result is a lifelong susceptibility to overwhelming post-splenectomy infection – usually shortened to OPSI. OPSI is rare (lifetime incidence roughly 5% if no precautions are taken; much lower with proper precautions) but can be severe or fatal when it occurs, with patients progressing from feeling “a bit unwell” to septic shock within hours. The whole purpose of post-splenectomy care is to make OPSI as unlikely as possible, and to act quickly if it does start.

Why some pancreatectomy patients lose their spleen

The spleen sits directly in front of the tail of the pancreas, and the two organs share their main blood supply — the splenic artery and splenic vein run along the back of the pancreas. When the body of the pancreas or the pancreatic tail is removed, the splenic vessels often have to be taken with it, which means the spleen loses its blood supply and must also be removed.

Specifically:

• Distal pancreatectomy WITH splenectomy – the standard operation for most pancreatic body/tail cancers. The spleen is removed deliberately along with the pancreas tail and the regional lymph nodes.

• Distal pancreatectomy WITHOUT splenectomy (spleen-preserving) – possible for some benign or low-risk lesions; the splenic vessels are either preserved (Kimura technique) or sacrificed but the spleen is left in place to be supplied by smaller collateral vessels (Warshaw technique). Not always possible – depends on tumour anatomy and surgeon judgement.

• Total pancreatectomy – usually includes splenectomy because the whole pancreas including the tail is removed, taking the splenic vessels with it.

• Other HPB operations – occasionally the spleen is removed during certain liver resections, in trauma surgery, or as part of more complex multi-visceral operations.

Whether your spleen has been removed should be clearly documented in your operation note and discharge summary. If you are unsure – ask your surgical team or Primary care physician (GP) to confirm. Some spleen-preserving operations leave the spleen technically present but with limited function, in which case the same precautions usually apply.

The bacteria you are particularly vulnerable to without a spleen

Three encapsulated organisms account for the majority of OPSI cases worldwide:

• Streptococcus pneumoniae (pneumococcus) – the single most common cause. Causes pneumonia, meningitis, septicaemia. The most important target of post-splenectomy vaccination.

• Neisseria meningitidis (meningococcus) – causes meningitis and septicaemia. Multiple serogroups exist; A, C, W, Y are covered by one vaccine and B is covered by a separate one.

• Haemophilus influenzae type b (Hib) – historically a major cause of childhood meningitis, now uncommon due to routine vaccination, but asplenic patients remain at higher risk.

Two additional organisms worth knowing about for specific situations:

• Capnocytophaga canimorsus – a bacterium that lives in the mouths of dogs and cats. After a dog or cat bite or scratch (or even a lick on broken skin), this organism can cause overwhelming sepsis in asplenic patients within 24–72 hours. Even apparently minor bites need urgent antibiotic cover.

• Babesia and malaria parasites – both cause more severe disease in asplenic patients. Travel to areas where these are endemic needs careful prophylaxis discussion before travel.

Plus: any usual influenza or COVID infection tends to be more severe in asplenic patients, making annual influenza vaccination and current COVID booster status particularly important.

The vaccine schedule – what, when, and why

Specific schedules vary slightly between countries (UK Green Book, Irish HSE/HIQA guidance, US ACIP recommendations) and are updated periodically – your team or GP should confirm the current recommended schedule against the most recent national guidance. The general framework is as follows:

Ideally – at least 2 weeks BEFORE planned splenectomy

If splenectomy is planned (as in most pancreatic surgery), the vaccines should be given at least 2 weeks before the operation. This gives the immune system time to mount a response while it still has a fully functioning spleen, producing better immunity than vaccines given afterwards.

• Pneumococcal conjugate vaccine (PCV13 or PCV20 depending on current national guidance)

• Pneumococcal polysaccharide vaccine (PPSV23) – usually given 8 weeks AFTER the conjugate vaccine

• Meningococcal ACWY conjugate vaccine (MenACWY)

• Meningococcal B vaccine (MenB, e.g., Bexsero) – usually two doses 4–8 weeks apart

• Haemophilus influenzae type b vaccine (Hib) – single dose

• Annual influenza vaccine – every autumn for life

• COVID-19 vaccine per current national booster guidance

If splenectomy was emergency or unplanned

Vaccines should be given as soon as the patient is well enough- typically 2 weeks after the operation. Earlier than that and the surgical inflammatory response may dampen the vaccine response.

Boosters and re-vaccination intervals

This is where many patients lose track. Typical (verify against current national guidance):

• PPSV23 – booster typically recommended every 5 years

• PCV13/PCV20 – usually a single dose, sometimes repeated per national guidance

• MenACWY – booster every 5 years

• MenB – boosters per current national guidance (varies)

• Hib – usually once, sometimes a booster

• Influenza – every year, no exceptions

• COVID-19 – per current national guidance, including any high-risk-group recommendations

Ask your GP to set a recall reminder on your medical record so that boosters are not missed. It is the single most common reason post-splenectomy patients drift out of compliance — boosters are forgotten when the original vaccinations were 5 years ago and life has moved on.

Antibiotic prophylaxis – daily vs rescue

There are two approaches, and the right choice depends on your individual risk profile, your country’s guidance, and your team’s recommendation. Some patients use one approach, some use the other, some use a combination.

Approach 1 – Daily preventive antibiotic (penicillin V)

Some guidelines recommend lifelong daily oral penicillin V (250 mg twice daily for adults) for all asplenic adults. This is more commonly applied in the UK (BSH guidance) than in Ireland or some other countries, where the policy is more selective. Daily penicillin reduces (but does not eliminate) the risk of OPSI from pneumococcus.

• Pros: significant additional protection against pneumococcal infection

• Cons: long-term antibiotic use, small risk of side effects, contributes (modestly) to antibiotic resistance, daily compliance burden

• Lifelong: yes, although some practitioners shorten the duration in some patients after several years if vaccine response is well-documented

Approach 2 – Rescue antibiotic for febrile illness (no daily prophylaxis)

Patient carries a supply of oral antibiotic (typically amoxicillin 500 mg, or co-amoxiclav, or an alternative if penicillin-allergic) and starts it immediately if they develop a fever, particularly when away from home or when medical access may be delayed. Importantly: starting the antibiotic does NOT replace seeking urgent medical attention – it buys time until properly assessed.

• Pros: no daily antibiotic burden, no daily compliance issue

• Cons: relies on the patient recognising fever early and acting fast

• Most countries’ guidance: every asplenic patient should carry a rescue antibiotic supply, regardless of whether they take daily prophylaxis

Discuss with your team or GP which approach applies to you, and make sure you have a current rescue antibiotic supply that has not expired. Carry it in any travel kit. If you are penicillin-allergic, the alternative is usually clarithromycin or doxycycline – discuss specifically.

The asplenia card or medical alert

Every asplenic patient should carry something that identifies them as asplenic in case they become unwell and cannot communicate. Options:

• A wallet card stating “Asplenic – increased risk of severe infection” and listing vaccinations received and rescue antibiotic. Available from patient charities, splenectomy support networks, or printable from BSH guidance.

• A medical alert bracelet or necklace (Medic Alert and similar services).

• Documentation in your phone’s emergency medical ID (iPhone Health app → Medical ID → editable from the lock screen). Add “Asplenic” and rescue antibiotic in use.

• Document on your GP record so it appears on any emergency department summary.

In an emergency, the difference between being treated as “a viral illness, go home with paracetamol” and being treated as “asplenic patient with fever – admit, blood cultures, broad-spectrum IV antibiotics now” can be a matter of survival.

Travel – what to plan in advance

• Routine vaccines up to date before travel.

• Travel-specific vaccines as for any traveller – but with extra attention to those that protect against encapsulated organisms or against malaria. Hepatitis A/B, typhoid, tick-borne encephalitis, yellow fever where relevant, rabies pre-exposure for some destinations.

• Malaria prophylaxis – asplenic patients have more severe malaria than people with functioning spleens. Strict adherence to prophylaxis is essential. Discuss with a travel medicine clinic before booking.

• Babesiosis – tick-borne, endemic in parts of the US, increasingly recognised in parts of Europe. Long sleeves, tick checks, prompt removal.

• Rescue antibiotic in hand luggage in original packaging with a doctor’s letter explaining the prescription – particularly for international travel and customs.

• A printed summary of your vaccination history is invaluable if you need emergency medical care abroad.

Dog and cat bites – the specific protocol

Capnocytophaga canimorsus infections are rare but disproportionately affect asplenic patients. The rule of thumb after any dog or cat bite or scratch, however minor, is:

• Wash the wound thoroughly with soap and running water for several minutes

• Contact your GP or emergency department the same day

• You will usually be started on prophylactic co-amoxiclav (or alternative if penicillin-allergic), typically for 5-7 days

• Tetanus and rabies status reviewed (rabies relevant if the bite was abroad)

• If a fever develops in the days following, attend emergency immediately – do not wait

When to seek urgent medical help

• Any fever (temperature 38°C or higher) – start your rescue antibiotic and contact your GP or attend emergency the same day. Do not wait to see if it settles.

• Rigors (shaking chills) – assume sepsis until proven otherwise. Emergency department, no delay.

• New rash that does not blanch under pressure – possible meningococcal disease. Emergency, no delay.

• Confusion, severe headache, neck stiffness, or photophobia – possible meningitis. Emergency.

• Severe sore throat with high fever – possible streptococcal infection requiring rapid attention.

• Persistent vomiting that prevents you taking rescue antibiotic – IV antibiotics may be needed.

• After any dog or cat bite – see protocol above.

• After any human bite or significant penetrating wound contaminated with environmental bacteria.

Asplenic patients can deteriorate from “slightly unwell” to “critically septic” within hours. Healthy people can sit at home with a fever overnight and re-assess in the morning; asplenic patients cannot afford that wait.

Who manages your long-term plan

Ideally, three people share responsibility:

• Your GP – keeps the vaccine schedule, booster reminders, rescue antibiotic prescription, and asplenia status flagged on your record.

• Your HPB surgical team or hepatology / pancreatic clinic – co-ordinates the asplenia plan with you in the early post-operative period and confirms the schedule at follow-up.

• You – the only person who is reliably present at every booster window, every febrile illness, every dog bite, every travel decision.

If you do not currently have a written asplenia plan that documents your vaccine history, your booster schedule, and your rescue antibiotic, ask your GP for one at your next appointment.

Resources

• BSH (British Society for Haematology) asplenia guidelines – the most widely-used UK reference. Available via b-s-h.org.uk

• UK Green Book – Immunisation against infectious disease (Chapter 7: Immunisation of individuals with underlying medical conditions). Authoritative UK schedule. Available via gov.uk

• HSE (Ireland) / HIQA / HPSC – Irish immunisation guidance, including chapter on asplenia. Available via hse.ie

• Splenectomy.co.uk – patient-led information site

• Patient leaflets from your local hepatobiliary unit or haematology department – ask for one

Evidence base

Key sources informing this article:

• Davies JM, Lewis MPN, Wimperis J et al. Review of guidelines for the prevention and treatment of infection in patients with an absent or dysfunctional spleen. Br J Haematol 2011;155(3):308–317. (Foundational UK BSH guidance; subsequent updates apply.)

• BSH Guideline Committee — periodic updates to BSH asplenia guidance — verify most recent version.

• Theilacker C et al. Overwhelming postsplenectomy infection: a prospective multicentre cohort study. Clin Infect Dis 2016;62(7):871–878.

• Sinwar PD. Overwhelming post splenectomy infection syndrome — review study. Int J Surg 2014;12(12):1314–1316.

• UK Department of Health & Social Care, Public Health England — Immunisation against infectious disease (the Green Book), Chapter 7.

• Centres for Disease Control and Prevention (CDC) — Asplenia and Adult Vaccination guidance.

• ESPEN guidance on perioperative care in elective hepatobiliary surgery (for the perioperative vaccine timing recommendations).

A final word

Losing your spleen does not stop you living a full life. Most asplenic patients never have a serious infection, because they keep their vaccines current, carry a rescue antibiotic, know what to do in an emergency, and have a GP who has flagged their asplenia status. The bad outcomes happen when one or more of these is allowed to drift – usually years after the original operation, when the original advice has faded.

If you take one thing from this article: book a 15-minute GP appointment in the next month and ask them to confirm your asplenia status is documented, that your vaccines are up to date, that you have a current rescue antibiotic supply, and that a booster recall has been added to your record. That single conversation is the single best protection you have.

Reviewed by Mr Tom Gallagher, Consultant HPB Surgeon, St Vincent’s Healthcare Group, Dublin. Last updated 26 May 2026.