Comparing Fatal H5N1 and Human Influenza Infections in Thailand
Author Information
Author(s): Vivek Shinde, Wanna Hanshaoworakul, James M. Simmerman, Ubolrat Narueponjirakul, Wiwan Sanasuttipun, Suchada Kaewchana, Darin Areechokechai, Kumnuan Ungchusak, Alicia M. Fry
Primary Institution: Centers for Disease Control and Prevention, Atlanta, Georgia, USA
Hypothesis
What are the clinical and epidemiological differences between fatal H5N1 and human influenza infections?
Conclusion
H5N1 cases had a high fatality rate and exhibited specific clinical and laboratory findings that could help target control efforts.
Supporting Evidence
- H5N1 cases had a higher fatality rate (68%) compared to human influenza cases (1%).
- Laboratory findings such as low white blood cell counts were associated with fatal outcomes in H5N1 cases.
- All H5N1 cases had direct exposure to sick or dead birds.
Takeaway
This study looked at people who got really sick from two types of flu: one from birds (H5N1) and one that usually spreads between people. It found that the bird flu was much more deadly.
Methodology
A retrospective cohort study using data from the National Avian Influenza Surveillance system.
Potential Biases
Potential bias due to retrospective data collection and incomplete medical records.
Limitations
The study may have missed H5N1 cases due to under-reporting and the sample size was small.
Participant Demographics
The study included 25 confirmed H5N1 cases and 230 hospitalized non-fatal human influenza cases, with a median age of 18 years for H5N1 cases.
Statistical Information
P-Value
p<0.001
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
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