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Amantadine for prophylaxis against influenza A
Abstract:
Amantadine, 200 mg daily, for 5 days was used in an attempt to restrict the spread of influenza A in a hospital ward. After index cases of influenza A amantadine was given to 2 patients with clinical symptoms and to 8/10 patients who were not yet ill. No further case of clinical influenza was seen among the patients, but 3 of those receiving amantadine developed subclinical infection. No side effects of amantadine were noted. Amantadine was not given to any of the 23 hospital staff on duty. In this group 8 cases of influenza A appeared, 3 of them during the week after the introduction of amantadine to patients.
Insights
Amantadine prophylaxis effectively prevented clinical influenza A in hospitalized patients. However, some patients developed subclinical infections, and hospital staff remained unaffected by the intervention.
Area of Science:
- Infectious Diseases
- Virology
- Hospital Epidemiology
Background:
- Influenza A poses a significant risk in hospital settings.
- Controlling nosocomial spread of influenza is crucial for patient safety.
Purpose of the Study:
- To evaluate the efficacy of amantadine in preventing influenza A transmission within a hospital ward.
- To assess the occurrence of clinical and subclinical infections during prophylaxis.
Main Methods:
- Amantadine (200 mg daily for 5 days) administered to patients following index cases of influenza A.
- Prophylaxis given to both symptomatic and asymptomatic patients.
- Control group: hospital staff without amantadine exposure.
Main Results:
- No new clinical influenza A cases observed among patients receiving amantadine.
- Three patients on amantadine developed subclinical influenza A infections.
- Eight cases of influenza A occurred among the 23 hospital staff.
Conclusions:
- Amantadine demonstrated effectiveness in preventing clinical influenza A spread among patients.
- Subclinical infections indicate potential limitations of amantadine prophylaxis.
- Hospital staff were not protected, highlighting the need for broader control measures.