Evolution of Influenza A Virus NP Genes in Taiwan
Author Information
Author(s): Lin Jih-Hui, Chiu Shu-Chun, Cheng Ju-Chien, Chang Hui-Wen, Hsiao Kuang-Liang, Lin Yung-Cheng, Wu Ho-Sheng, Salemi Marco, Liu Hsin-Fu
Primary Institution: Centers for Disease Control, Taipei, Taiwan
Hypothesis
The study aims to investigate the evolutionary pathway of nucleoprotein (NP) genes for human influenza viruses circulating in Taiwan from 1979 to 2009.
Conclusion
The study found that the effective number of infections of influenza A viruses in Taiwan showed a period of steady growth followed by a recent rise in the rate of spread.
Supporting Evidence
- The NP gene has evolved independently in human and avian hosts after the 1918 flu pandemic.
- Phylogenetic analysis showed that H3 isolates were genetically divided into two clades after 2004.
- Selective pressure on the NP gene was dominated by purifying selection with a mean dN/dS ratio of 0.105.
Takeaway
Scientists studied how the flu virus changed in Taiwan over 30 years, finding that it grew and spread in different ways during that time.
Methodology
The study used Bayesian Markov Chain Monte Carlo framework for phylodynamic analysis of NP genes from influenza A viruses.
Potential Biases
Potential bias due to limited sampling before 2000 and reliance on available sequences.
Limitations
Limited information was available on the molecular evolution and population dynamics of influenza A virus in Taiwan prior to 2000.
Participant Demographics
The study analyzed influenza A virus strains isolated from patients with influenza-like illness in Taiwan.
Statistical Information
P-Value
0.105
Confidence Interval
95% HPD: 0.319–0.373
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
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