Influenza: What to Do When Antiviral Treatment Fails to Reduce Fever and Symptoms

This protocol applies to patients with influenza who have not achieved adequate reduction in fever and influenza symptoms following an initial course of antiviral therapy, or who deteriorate after an initial response.

Previous Treatment Line & Failure Condition

The first-line approach uses a single neuraminidase inhibitor — oseltamivir, zanamivir, or peramivir — with the treatment goal of reducing the duration of fever and influenza symptoms. When that goal is not met, or when the patient worsens after early improvement, escalation to the next line is indicated.

Next-Line Approach

In patients who fail to improve or who deteriorate despite ongoing antiviral treatment, the next step involves investigating for bacterial coinfection of the respiratory tract and initiating empirical treatment for it, alongside continued antiviral therapy. The complete investigative and empirical treatment strategy is in the full protocol.

Instant Access to Structured Evidence-Based Regimens

References

DOI: 10.1093/cid/ciy866

Clinicians should investigate and empirically treat bacterial coinfection in patients who deteriorate after initial improvement, particularly in those treated with antivirals (A-III).
Clinicians can consider investigating bacterial coinfection in patients who fail to improve after 3–5 days of antiviral treatment (C-III).

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