Yes, patients receiving chemotherapy should receive the inactivated (injectable) influenza vaccine annually.
Patients on chemotherapy should be vaccinated with inactivated influenza vaccine (IIV), not live attenuated vaccine, as they are at high risk for severe influenza complications and death. 1
Key Recommendations
Vaccine Type
- Only inactivated influenza vaccine (IIV) should be used - never live attenuated influenza vaccine (LAIV) 1, 2
- Live vaccines are contraindicated during chemotherapy due to risk of vaccine-strain infection in immunocompromised patients 3
Optimal Timing During Chemotherapy
The timing of vaccination relative to chemotherapy cycles matters for immunogenicity, though vaccination should not be delayed if optimal timing isn't feasible:
- For solid tumors: Vaccinate mid-cycle, ideally ≥2 weeks after chemotherapy and before the next cycle 1, 2
- For hematologic malignancies: Vaccinate when leukocyte count is normal, just before initiating the next cycle 2
- Research shows vaccination on day 1 versus day 11 of a 3-week cycle produces comparable responses, though early vaccination (day 4) may trend toward better antibody titers 4, 5
Special Considerations
Anti-B cell therapies (rituximab, alemtuzumab):
- Defer vaccination for 6 months after last dose, ideally until B-cell recovery 1
- These agents cause persistent B-cell depletion with severely impaired vaccine responses 2
Hematopoietic stem cell transplant (HSCT):
- Begin vaccination 4-6 months post-transplant 1
Solid organ transplant:
- Can vaccinate ≥3 months post-transplant (may consider ≥1 month during active flu season) 1
Immune checkpoint inhibitors:
- Inactivated influenza vaccine appears safe with predominantly grade 1-2 immune-mediated adverse events 6
Expected Response
Important caveat: Chemotherapy patients have attenuated immune responses compared to healthy individuals 2, 7:
- Many patients still achieve seroprotection despite reduced responses
- Two doses of adjuvanted vaccine may improve immunogenicity in cancer patients 2
- Response is better in chemotherapy-naive patients and those who completed treatment 2
Household Contacts
All household contacts should receive annual influenza vaccination 1, 8:
- Contacts can receive either inactivated or live attenuated vaccine
- Exception: Close contacts of HSCT recipients should receive inactivated vaccine only (not LAIV) 8
Timing Relative to Flu Season
- Vaccinate as soon as vaccine becomes available (September-November optimal) 1
- Continue vaccination efforts through January or later as influenza typically peaks January-March 9
- Don't delay vaccination waiting for "perfect" timing in chemotherapy cycle
Why This Matters
Influenza-related death is more common among patients with chronic conditions including cancer than any other group 9. Despite reduced immunogenicity, vaccination provides meaningful protection - a 32% reduction in influenza-associated hospitalization in immunocompromised populations 10. The benefits clearly outweigh minimal risks, with no increased serious adverse events or disease exacerbation 10.