Abstract
This study investigated influenza activity in Bangkok, Thailand between June 2009 and July 2012. Real-time reverse transcription polymerase chain reaction (RT-PCR) was performed to detect influenza viruses among patients with influenza-like illnesses. Of the 6417 patients tested, influenza virus infection was detected in 42% (n = 2697) of the specimens. Influenza A pH1N1 viruses comprised the predominant strain between 2009 and 2010, and seasonal influenza (H3) had a high prevalence in 2011. Laboratory data showed a prevalence and seasonal pattern of influenza viruses. In 2009, influenza activity peaked in July, the rainy season. In 2010, influenza activity happened in two phases, with the initial one at the beginning of the year and another peak between June and August 2010, which again corresponded to the rainy period. Influenza activity was low for several consecutive weeks at the beginning of 2011, and high H3N2 activity was recorded during the rainy season between July and September 2011. However, from the beginning of 2012 through July 2012, pH1N1, influenza H3N2, and influenza B viruses continuously circulated at a very low level. The seasonal pattern of influenza activity in Thailand tended to peak during rainy season between July and September.
Highlights
This study investigated influenza activity in Bangkok, Thailand between June 2009 and July 2012
Samples positive for influenza A virus were subtyped into seasonal H1N1, seasonal H3N2, pandemic (H1N1) 2009 viruses, and influenza B virus
This study indicated that most patients who attended a hospital during the influenza season were diagnosed with influenza viruses that caused acute respiratory tract infections
Summary
This study investigated influenza activity in Bangkok, Thailand between June 2009 and July 2012. In 2010, influenza activity happened in two phases, with the initial one at the beginning of the year and another peak between June and August 2010, which again corresponded to the rainy period. From the beginning of 2012 through July 2012, pH1N1, influenza H3N2, and influenza B viruses continuously circulated at a very low level. Conclusion: The seasonal pattern of influenza activity in Thailand tended to peak during rainy season between July and September. In addition to seasonal influenza, occasional outbreaks of pandemic influenza have occurred on a global scale These outbreaks have invariably been caused by a virus to which the majority of people have not yet had the opportunity to develop sufficient immunity. The pH1N1 virus has been considered with the same level of concern as seasonal influenza and still continues to circulate among human populations
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