Corticosteroid Injections Should NOT Be Given for Influenza Treatment
Clinicians should not administer corticosteroid therapy for the treatment of adults or children with suspected or confirmed seasonal influenza, influenza-associated pneumonia, respiratory failure, or ARDS, unless clinically indicated for other reasons. 1
The Evidence Against Corticosteroids in Influenza
Guideline Recommendations
The Infectious Diseases Society of America (IDSA) 2019 guidelines provide a clear directive against corticosteroid use in influenza 1. This recommendation is based on consistent evidence showing harm rather than benefit.
The Society of Critical Care Medicine and European Society of Intensive Care Medicine 2017 guidelines specifically recommend against the use of corticosteroids in hospitalized adults with influenza, citing very low quality evidence but consistent signals of harm 1.
Why Corticosteroids Are Harmful in Influenza
Increased mortality: Multiple observational studies demonstrate that corticosteroid use in critically ill influenza patients is associated with significantly higher death rates 1, 2. A South Korean study of 245 critically ill patients with pandemic H1N1 found that the 90-day mortality rate was 58% in the steroid group versus 27% in the no-steroid group (adjusted odds ratio 2.20) 2.
Higher infection rates: Corticosteroids increase the risk of superinfections, including secondary bacterial pneumonia and invasive fungal infections 2, 3. This occurs because steroids suppress the immune response needed to clear both the viral infection and prevent opportunistic pathogens.
Prolonged viral replication: Corticosteroids may extend the duration of influenza viral shedding, allowing continued viral replication when the body needs to mount an effective antiviral response 1.
The Most Recent Evidence (2024-2026)
The WHO 2024 clinical practice guidelines for influenza issued a conditional recommendation against corticosteroids for severe influenza 4, 5. A 2026 systematic review and meta-analysis specifically examining non-COVID pneumonia and ARDS found that while corticosteroids may reduce mortality in bacterial pneumonia, the evidence for influenza remains concerning 6.
Common Clinical Pitfalls
Pitfall #1: Using steroids for "airway obstruction" - A Canadian study found that 54% of critically ill influenza patients received corticosteroids, primarily driven by perceived airway obstruction and hemodynamic instability 7. However, this practice is not evidence-based and may worsen outcomes.
Pitfall #2: Early steroid administration - If steroids must be used for another indication (e.g., COPD exacerbation, adrenal insufficiency), they should be initiated after at least 72 hours of neuraminidase inhibitor (NAI) treatment, not before 3. Early corticosteroid use before antiviral therapy is associated with worse prognosis.
Pitfall #3: Confusing influenza with bacterial pneumonia - While corticosteroids may have a role in severe community-acquired bacterial pneumonia 1, 6, this benefit does not extend to influenza. Always investigate and treat bacterial coinfection separately with appropriate antibiotics 1.
What TO Do Instead
Antiviral therapy: Administer oseltamivir for severe influenza within 48 hours of symptom onset 4, 5. For patients at high risk of progression, baloxavir may be considered 4.
Investigate bacterial coinfection: Empirically treat bacterial coinfection in patients with severe disease (extensive pneumonia, respiratory failure, hypotension) in addition to antiviral treatment 1.
Supportive care: Focus on mechanical ventilation strategies, fluid management, and hemodynamic support without corticosteroids 1.
The Only Exceptions
Corticosteroids may be administered if there is a separate clinical indication unrelated to influenza treatment 1:
- Pre-existing adrenal insufficiency requiring replacement therapy
- Severe asthma or COPD exacerbation (though even here, timing after NAI initiation is critical) 3
- Other endocrine or rheumatologic conditions requiring ongoing steroid therapy
Regarding Corticosteroid Injections and Influenza Vaccination
If your question relates to corticosteroid injections (such as joint injections or epidural steroid injections) and their timing with influenza vaccination, the guidance is different 8:
For non-urgent corticosteroid injections: Perform the injection at least 1 week before or after influenza vaccine administration to avoid blunting vaccine efficacy 8.
For patients on chronic oral corticosteroids: Those taking prednisone ≥20 mg daily should still receive influenza vaccination despite reduced immunogenicity, as the benefit of vaccination outweighs the risk even with suboptimal response 1.