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A TIME'S MEMORY - Flu, Bugs & Other Accidents Blog - Year: XIII - Here, Reader, you will find many items if your interests are in the field of emerging threats to global or public health, with a perspective that is not mainstream. Thank to You for the interest!

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27 May 2018

#China, #Influenza [#H1N1pdm09, #H3N2, B, #H7N9] - Weekly #Report - Wk 20 2018 (CNIC, May 27 ‘18)

          

Title:

#China, #Influenza [#H1N1pdm09, #H3N2, B, #H7N9]  - Weekly #Report - Wk 20 2018.

Subject:

Human and Animal Influenza Viruses, A (H1, H3, H7) & B subtypes, current epidemiological situation in China.

Source:

National Influenza Centre, PR of China, full page: (LINK).

Code:

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China, Influenza Weekly Report - Week 20

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(All data are preliminary and may change as more reports are received).


Summary

  • During week 20, influenza activity in both southern and northern provinces was at inter-seasonal levels, only a few influenza viruses can be detected, the majority were A(H1N1)pdm09.
  • Among influenza viruses antigenically characterized by CNIC since October 1st, 2017:
    • 357(94.2%) influenza A(H1N1)pdm09 viruses were characterized as A/Michigan/45/2015-like;
    • 116(32.3%) influenza A(H3N2) viruses were characterized as A/Hong Kong/4801/2014 (H3N2)(EGG)-like,
    • 324(90.3%) influenza A(H3N2) viruses were characterized as A/Hong Kong/4801/2014 (H3N2)(CELL)-like;
    • 106(53.8%) influenza B/Victoria viruses were characterized as B/Brisbane/60/2008-like;
    • 592(97.0%) influenza B/Yamagata viruses were characterized as B/Phuket/3073/2013-like.
  • Among the influenza viruses tested by CNIC for antiviral resistance analysis since October 1st, 2017:
    • all influenza A(H1N1)pdm09 and A(H3N2) viruses were resistant to adamantine;
    • All influenza A(H1N1)pdm09, A(H3N2) and B viruses were sensitive to neuraminidase inhibitors.


Outbreak Surveillance

  • During week 20(May 14th –May 20th, 2018), there were 9 outbreaks reported nationwide, 4 of them were A(H1N1)pdm09, 1 of them was B, 1 of them was not obtained the detection result, 3 of them were negative.


Surveillance of outpatient or emergency visits for Influenza-like Illness (ILI)

  • During week 20, the percentage of outpatient or emergency visits for ILI (ILI %) at national sentinel hospitals in south China was 4.0%, higher than the last week (3.7%), higher than the same week of 2015 - 2017(3.1%,3.4%,3.3%). (Figure 1)
  • During week 20, ILI% at national sentinel hospitals in north China was 2.3%, same as the last week (2.3%), higher than the same week of 2016-2017(2.2%), lower than the same week of 2015-2016 and 2017-2018(2.4%,2.5%). (Figure 2)

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Figure 1. Percentage of Visits for ILI at Sentinel Hospitals in South China (2015-2019)

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Figure 2. Percentage of Visits for ILI at Sentinel Hospitals in North China (2015-2019)

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Virologic Surveillance

  • During week 20, influenza network laboratories tested 4319 specimens, of which 65(1.5%) were positive for influenza, influenza A and influenza B viruses were 50(76.9%) and 15(23.1%), respectively (Table 1).
  • During week 20, the percentage of specimens that were tested positive for influenza in south China was 1.6%, which was lower than the previous week (2.2%) (Figure 3).
  • During week 20, the percentage of specimens that were tested positive for influenza in north China was 1.0%, which was slightly lower than the previous week (1.1%). (Figure 4).


Table 1 Laboratory Detections of ILI Specimens (Week 20, 2018)

[Week 20 - South China - North China – Total]

  • No. of specimens tested – 3334 – 985 – 4319
    • No. of positive specimens (%) - 55(1.6%) - 10(1.0%) - 65(1.5%)
      • Influenza A - 48(87.3%) - 2(20.0%) - 50(76.9%)
        • A(H3N2) - 0(0) - 0(0) - 0(0)
        • A(H1N1)pdm09 - 47(97.9%) - 2(100%) - 49(98.0%)
        • A (subtype not determined) - 1(2.1%) - 0(0) - 1(2.0%)
      • Influenza B - 7(12.7%) - 8(80%) - 15(23.1%)
        • B (lineage not determined) - 0(0) - 0(0) - 0(0)
        • Victoria - 1(14.3%) - 6(75.0%) - 7(46.7%)
        • Yamagata - 6(85.7%) - 2(25.0%) - 8(53.3%)

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Figure 3. Influenza Positive Tests Reported by Southern Network Laboratories (Week 14, 2017–Week 20, 2018)

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Note: Analysis in this part was based on the test results of network laboratories. If it were not consistent with the results of CNIC confirmation, the results of CNIC confirmation were used.

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Figure 4. Influenza Positive Tests Reported by Northern Network Laboratories (Week 14, 2017–Week 20, 2018)

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Note: Analysis in this part was based on the result of network laboratories. If it were not consistent with the results of CNIC confirmation, the results of CNIC confirmation were used.

(…)

H7N9 case report

  • Since the notification of human infection with novel reassortant influenza A(H7N9) virus on 31 March 2013, in total 1564 laboratory-confirmed cases have been reported to WHO.
  • Among them, 32 cases were infected with HPAI A(H7N9) virus, which have mutations in the hemagglutinin gene indicating a change to high pathogenicity in poultry.
  • These 32 cases are from Taiwan (the case had travel history to Guangdong), Guangxi, Guangdong, Hunan, Shaanxi, Hebei, Henan, Fujian, Yunnan provinces, with illness onset date before October 2017.
  • No increased transmissibility or virulence to human case was detected in the HPAI A(H7N9) virus.

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|-- china flu report 1820.pdf –|

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Keywords: China; Updates; Seasonal Influenza; Avian Influenza; H1N1pdm09; H3N2; B, H7N9.

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