Antibiotic use in influenza
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Antibiotic Use in Influenza: Patterns and Drivers
Antibiotics are often prescribed for respiratory tract infections, including influenza, even though influenza is a viral illness and antibiotics are only effective against bacteria. Studies consistently show that a large proportion of patients with influenza or influenza-like illness (ILI) receive antibiotics unnecessarily, both in outpatient and inpatient settings, and across age groups and countries Low2008Schober2023Li2025+2 MORE.
Inappropriate Antibiotic Prescribing in Influenza
Research from multiple countries highlights that inappropriate antibiotic use is widespread among both children and adults with influenza. In Canada, over two-thirds of children hospitalized for influenza received antibiotics, and more than half of those had no appropriate indication for antibiotic treatment . In China, about 13% of pediatric influenza patients in outpatient and emergency settings were prescribed antibiotics, with most receiving both antivirals and antibiotics, even after excluding cases with confirmed bacterial infections . In the United States, 41% of outpatients with acute respiratory infections during influenza seasons were prescribed antibiotics, and nearly half of these prescriptions were for conditions where antibiotics are not indicated, such as viral upper respiratory tract infections and bronchitis .
Factors Influencing Antibiotic Use
Several factors contribute to the high rate of antibiotic prescribing in influenza cases. These include diagnostic uncertainty, pressure from patients or caregivers, and institutional practices that vary widely between centers Low2008Schober2023Li2025+1 MORE. For example, fever, longer hospital stays, and certain clinical diagnoses were associated with higher rates of inappropriate antibiotic use in children Schober2023Li2025. Social factors, such as requirements for school or daycare clearance, also play a role in driving unnecessary prescriptions .
Consequences of Unnecessary Antibiotic Use
The overuse of antibiotics in viral infections like influenza has significant consequences. It is a major driver of antibiotic resistance at both local and regional levels . Additionally, recent research shows that antibiotic use during influenza infection can impair lung immune defenses, increasing the risk of secondary bacterial infections and leading to worse outcomes, such as higher rates of lung eosinophilia and impaired bacterial clearance . Importantly, studies have found that antibiotic use in children with ILI does not reduce illness duration or class absenteeism, further questioning the benefit of such prescriptions .
Antibiotic Classes and Seasonal Trends
Macrolides and cephalosporins are among the most commonly prescribed antibiotics for influenza patients Li2025Amiche2021. In the US, inpatient antibiotic use, especially of macrolides and extended-spectrum cephalosporins, shows strong seasonality that matches influenza activity, indicating that influenza seasons drive increased antibiotic use in hospitals .
Strategies to Reduce Unnecessary Antibiotic Use
Improving diagnostic accuracy is key to reducing inappropriate antibiotic use. Rapid and reliable tests, such as RT-PCR for influenza, can help distinguish viral from bacterial infections and guide appropriate therapy Low2008Havers2018. The use of antiviral drugs, particularly neuraminidase inhibitors, is effective in preventing and treating influenza and can reduce the incidence of complications and associated antibiotic use . Influenza vaccination also plays a role in reducing antibiotic prescriptions by preventing influenza-associated acute respiratory illnesses .
Special Considerations: Antibiotics with Antiviral Activity
Some antibiotics, such as azithromycin, have shown potential antiviral effects against influenza in laboratory studies, but their clinical relevance for routine influenza treatment remains unclear and is not a standard practice .
Impact on Hospitalization and Outcomes
While some studies suggest that combined antibiotic and antiviral therapy may slightly reduce the risk of hospitalization in high-risk influenza patients, the absolute benefit is small and must be weighed against the risks of antibiotic overuse .
Conclusion
Antibiotic use in influenza remains common and is often inappropriate, driven by diagnostic uncertainty, social pressures, and institutional practices. This overuse contributes to antibiotic resistance and may impair immune responses, increasing the risk of complications. Improved diagnostics, adherence to prescribing guidelines, use of antivirals, and vaccination are key strategies to reduce unnecessary antibiotic use and its associated harms.
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Most relevant research papers on this topic
Reducing antibiotic use in influenza: challenges and rewards.
Reducing antibiotic use in influenza by encouraging rigorous diagnosis, prevention, and treatment with antiviral drugs like neuraminidase inhibitors can significantly impact antimicrobial use and resistance.
DOI
Antibiotic use during influenza infection augments lung eosinophils that impair immunity against secondary bacterial pneumonia
Antibiotic use during influenza infection impairs lung immunity against secondary bacterial pneumonia by increasing lung eosinophils, increasing the risk of developing a secondary bacterial infection.
Azithromycin, a 15-membered macrolide antibiotic, inhibits influenza A(H1N1)pdm09 virus infection by interfering with virus internalization process
Azithromycin shows potential as an effective macrolide for treating human influenza by inhibiting virus internalization and reducing viral load in the lungs.
Reducing Antibiotic Use in Ambulatory Care through Influenza Vaccination.
Influenza vaccination can reduce unnecessary antibiotic use and help combat antibiotic resistance in outpatients with acute respiratory illness.
DOI
Association between the Use of Antibiotics, Antivirals, and Hospitalizations among Patients with Laboratory Confirmed Influenza.
Antivirals and antibiotics, or both, significantly reduce the risk of hospitalization within 30 days for all-cause and respiratory illnesses compared to those without treatment.
DOI