ICU · Infectious Diseases
Sepsis in the immunocompromised host
Also known as Immunocompromised sepsis · Febrile neutropenia sepsis · Sepsis in cancer/transplant patients
Immunocompromised patients with sepsis have different pathogens, atypical presentations, and higher mortality than immunocompetent patients. Categories: neutropenic (chemotherapy — see neutropenic sepsis topic), cellular (HIV, transplant — T-cell defects), humoral (multiple myeloma, CLL — B-cell defects), splenectomised (encapsulated organisms), corticosteroid-treated. Atypical presentations: may lack fever (blunted inflammatory response), may have subtle signs. Broader empiric antibiotic coverage needed. Consider: opportunistic infections (PCP, CMV, fungal, mycobacterial, viral). Principles: (1) early broad-spectrum antibiotics (within 1 hour), (2) aggressive resuscitation, (3) identify and treat opportunistic pathogens, (4) consult infectious diseases early.
Checked against its sources on 3 Sept 2026
Practise this topic
On this page
Study tools
Your progress
Saved on this device.
Target exams
Red flags
- Immunocompromised patients may NOT mount fever — absence of fever does NOT exclude infection
- Broader empiric coverage needed — cover typical + atypical + opportunistic organisms
- Splenectomised: overwhelming post-splenectomy infection (OPSI) — encapsulated organisms, rapid progression, DIC, mortality up to 50%
- Corticosteroid-treated: may mask signs of infection. Consider opportunistic (PCP, fungal, CMV, strongyloides)
Meet the patient
A 56-year-old man arrives in ED with a six-hour history of fever, rigors, myalgia and vomiting. He had a splenectomy four years ago after trauma. He is confused, BP 78 over 40, HR 132, RR 32, and he has widespread purpuric skin lesions. Lactate 6.2, INR 2.1, platelets 34. A peripheral smear shows Gram-positive diplococci. He takes penicillin V prophylaxis intermittently and has no written record of vaccination.[4]
This is the canonical asplenic-sepsis stem, and it plants the central teaching of the whole topic: in the immunocompromised host, the immune defect tells you the pathogen before the culture comes back. An asplenic patient with purpura and shock has overwhelming post-splenectomy infection (OPSI) with pneumococcus until proven otherwise, and the time-critical move is ceftriaxone within the hour — not waiting for confirmation. Map the defect, broaden the cover, sample everything early.[4]
References10ShowHide
- [1]Evans L, Rhodes A, Alhazzani W, et al. Surviving Sepsis Campaign: International Guidelines for Management of Sepsis and Septic Shock 2021 Crit Care Med, 2021.PMID 34605781
- [2]Freifeld AG, Bow EJ, Sepkowitz KA, et al. Clinical practice guideline for the use of antimicrobial agents in neutropenic patients with cancer: 2010 update by the Infectious Diseases Society of America Clin Infect Dis, 2011.PMID 21258094
- [3]Herbrecht R, Denning DW, Patterson TF, et al. Voriconazole versus amphotericin B for primary therapy of invasive aspergillosis N Engl J Med, 2002.PMID 12167683
- [4]Davies JM, Lewis MP, Wimperis J, et al. Review of guidelines for the prevention and treatment of infection in patients with an absent or dysfunctional spleen: prepared on behalf of the British Committee for Standards in Haematology by a working party of the Haemato-Oncology task force Br J Haematol, 2011.PMID 21988145
- [5]Hilbert G, Gruson D, Vargas F, et al. Noninvasive ventilation in immunosuppressed patients with pulmonary infiltrates, fever, and acute respiratory failure N Engl J Med, 2001.PMID 11172189
- [6]Antonelli M, Conti G, Bufi M, et al. Noninvasive ventilation for treatment of acute respiratory failure in patients undergoing solid organ transplantation: a randomized controlled trial JAMA, 2000.PMID 10634340
- [7]Patterson TF, Thompson GR 3rd, Denning DW, et al. Practice Guidelines for the Diagnosis and Management of Aspergillus: 2016 Update by the Infectious Diseases Society of America Clin Infect Dis, 2016.PMID 27365388
- [8]Cordonnier C, Cesaro S, Maschmeyer G, et al. Pneumocystis jirovecii pneumonia: still a concern in patients with haematological malignancies and stem cell transplant recipients J Antimicrob Chemother, 2016.PMID 27550990
- [9]Lenti MV, Luu S, Carsetti R, et al. Asplenia and spleen hypofunction Nat Rev Dis Primers, 2022.PMID 36329079
- [10]Li H, Zhou G, Chen X, et al. A regimen based on the combination of trimethoprim/sulfamethoxazole with caspofungin and corticosteroids as a first-line therapy for patients with severe non-HIV-related pneumocystis jirovecii pneumonia: a retrospective study in a tertiary hospital BMC Infect Dis, 2024.PMID 38297200