Thursday, June 12, 2014

CHP: Epidemiological Summary Of The Second Wave Of H7N9

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# 8734

 

 

Via Hong Kong’s CHP’s excellent bi-weekly online journal Communicable Diseases Watch, we get a detailed Summary of the second wave of human infections with avian influenza A(H7N9) virus reported by Miss Amy Li, Scientific Officer, Respiratory Disease Office, Surveillance and Epidemiology Branch, CHP.

 

As you can readily tell by the graphic at the top of this post, the second wave was considerably greater (both in numbers and duration)  than the first, and while cases have now largely halted for the summer, there are ample reasons to expect this virus to return in the fall.

 

This is a data-rich summary, with a number of good graphics, so you’ll want to download the PDF and read the analysis in its entirety.

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In it you’ll also find reports on CA-MRSA in a Hong Kong boarding school, the findings of 15 years of acute flaccid paralysis surveillance in Hong Kong, and a variety of other infectious disease reports.

 

Summary of the second wave of human infections with avian influenza A(H7N9) virus


Reported by Miss Amy Li, Scientific Officer, Respiratory Disease Office, Surveillance and Epidemiology Branch, CHP.


Human  infections  with  avian  influenza  A(H7N9)  virus  first emerged  in  Mainland  China  in  early  2013. Two  distinct  waves  of  human  infections  have  been  observed. The  first  wave  occurred from February to May 2013 involving a total of 133 human cases (including 43 deaths). Subsequently, two sporadic cases occurred in the summer of 2013 before the increase in cases from October 2013 that gave rise to the second wave of human infections which has  largely  subsided  in  June  2014. Figure  1  shows  the  epidemic curve of the first and second waves. Cumulatively, a total of 448 human H7N9 infections have been reported, including at least 157 deaths  (as  of  June  9, 2014). The  number  of  cases  in  the  second wave  starting  in  October  2013  was  much  greater  than  the  first wave, with 313 cases reported as compared with 133 cases in the first wave.


The second wave reached a peak in late January  2014  and  has started  to  subside  since then. Although there  were  still  sporadic cases occurring occasionally in May 2014, the number of reported cases  has  markedly  decreased,  indicating  that  the  situation  has been under control during summer time. In the past four weeks (from  May  11  to  June  7, 2014), only 12 new  human  cases  were reported  with  three  cases  reported  per  week  on  average,  as compared with 32 to 45 cases reported per week during the peak in early 2014. The last reported case had onset on May 22, 2014 and  occurred  in  Jiangsu  while  the  last  case  in  Guangdong  had onset on May 12, 2014. 

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