Recognizing true H5N1 infections in humans during confirmed outbreaks
Mukhtiar Zaman1, Viktor Gasimov, Ahmet Faik Oner
1Khyber Teaching Hospital, Khyber Medical University, Peshawar, Pakistan. mza@hotmail.com.
Journal of Infection in Developing Countries
|February 13, 2014
Summary
Early identification of H5N1 avian influenza cases is crucial. Fever and headache at presentation may suggest H5N1, and prompt oseltamivir treatment significantly improves survival rates.
Area of Science:
- Epidemiology
- Infectious Diseases
- Public Health
Background:
- Distinguishing H5N1 avian influenza cases at presentation without viral testing is challenging.
- Clinical characteristics at the time of urgent medical attention may aid in early case identification.
Purpose of the Study:
- To evaluate clinical features present at initial medical evaluation for differentiating H5N1 cases.
- To assess the impact of early antiviral treatment on H5N1 outcomes.
Main Methods:
- Retrospective analysis of H5N1 cases from the global avian influenza registry (2005-2011).
- Comparison of demographic data, poultry exposure, and presenting symptoms between confirmed and possible H5N1 cases.
- Evaluation of oseltamivir treatment efficacy based on timing of administration.
Main Results:
- Fever and headache were more frequent in confirmed H5N1 cases.
- Exposure to infected humans was higher in confirmed cases.
- Oseltamivir treatment demonstrated a survival benefit, particularly when initiated within two days of symptom onset (51% case fatality reduction).
Conclusions:
- Prompt antiviral treatment with oseltamivir offers a significant survival advantage for H5N1 patients.
- Presumptive antiviral treatment should be considered for suspected H5N1 cases during outbreaks to potentially save lives.
