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Epidemic Situation

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NATIONAL WEEKLY INFLUENZA BULLETIN OF THE RUSSIAN FEDERATION

week 46 of 2020 (09.11.20 - 15.11.20)

Summary

Influenza and ARI incidence data. Increase of influenza and other ARI activity in Russia in comparison with previous week. The nationwide ILI and ARI morbidity level (74.4 per 10 000 of population) was higher than national baseline (72.4) by 2.8%.

Etiology of ILI & ARI. Among 2463 investigated patients no influenza cases were detected (PCR).

ARVI detections. The overall proportion of respiratory samples tested positive for other ARVI (PIV, ADV, RSV, RhV, CoV, MPV, BoV) was estimated in total as 7.3% (PCR).

In sentinel surveillance system clinical samples from 64 SARI and 37 ILI/ARI patients were investigated by rRT-PCR, among them no influenza cases recognized. Among 50 SARI cases one (2.0%) case of ADV infection recognized. Among 29 ILI/ARI patients 8 (27.6%) cases were positive for ARVI, including one case of ADV and 7 RhV infection cases. 6 (9.8%) of 61 SARI and 8 (4.2%) of 192 ILI/ARI patients were positive for coronavirus SARS-CoV-2.

COVID-2019. Totally 2 015 608 cases and 34 850 deaths associated with COVID-2019 were registered in Russia including 23 610 cases and 463 deaths in last 24 hours (on 12:00 of 19.11.2020). According to the data obtained by NIC in Saint-Petersburg totally 20 088 clinical samples were PCR investigated in last week. Among them coronavirus SARS-CoV-2 detected in 4250 (21.2%) cases.

Influenza and ARI morbidity data

Fig. 1. Influenza and ARVI morbidity in 61 cities under surveillance in Russia, seasons 2019/20 and 2020/21
Rates per 10 000 populationFig. 1. Influenza and ARVI morbidity in 61 cities under surveillance in Russia, seasons 2019/20 and 2020/21

Weeks

  • Morbidity 2020/21Morbidity 2020/21
  • Morbidity 2019/20Morbidity 2019/20
  • MEM baseline 2020/21MEM baseline 2020/21

Epidemiological data showed increase of influenza and other ARI activity in Russia in comparison with previous week. The nationwide ILI and ARI morbidity level (74.4 per 10 000 of population) was higher than national baseline (72.4) by 2.8%.

Fig. 2. Comparative data on incidence rate of clinically diagnosed influenza, seasons 2019/20 and 2020/21
Rates per 10 000 populationFig. 2. Comparative data on incidence rate of clinically diagnosed influenza, seasons 2019/20 and 2020/21

Weeks

  • Season 2020/21Season 2020/21
  • Season 2019/20Season 2019/20
  • MEM baselineMEM baseline

Incidence rate of clinically diagnosed influenza decreased comparing to previous week and amounted to 0.00055 per 10 000 of population, it was significantly lower than pre-epidemic MEM baseline (0.061).

Fig. 3. Comparison of hospitalization rate with clinical diagnosis of influenza, seasons 2019/20 and 2020/21
Rates per 10 000 populationFig. 3. Comparison of hospitalization rate with clinical diagnosis of influenza, seasons 2019/20 and 2020/21

Weeks

  • Season 2020/21Season 2020/21
  • Season 2019/20Season 2019/20
  • MEM baselineMEM baseline

Hospitalization rate of clinically diagnosed influenza decreased comparing to previous week and amounted to 0.00018 per 10 000 of population, it was significantly lower than pre-epidemic MEM baseline (0.046).

Influenza and ARVI laboratory testing results

Cumulative results of influenza laboratory diagnosis by rRT-PCR were submitted by 44 RBLs and two WHO NICs. According to these data as a result of 2463 patients investigation no respiratory samples positive for influenza were detected by PCR.

Fig. 4. Geographic distribution of RT-PCR detected influenza viruses in cities under surveillance in Russia, week 46 of 2020
Fig. 4. Geographic distribution of RT-PCR detected influenza viruses in cities under surveillance in Russia, week 46 of 2020
PCR results
  • No dataNo data
  • No viruses detectedNo viruses detected
  • H1pdm09H1pdm09
  • H3H3
  • H3+H1pdm09H3+H1pdm09
  • BB
  • B+H1pdm09B+H1pdm09
  • B+H3B+H3
  • B+H3+H1pdm09B+H3+H1pdm09

 

Fig. 5. Monitoring of influenza viruses detection by RT-PCR in Russia, season 2020/21
Number of positive casesFig. 5. Monitoring of influenza viruses detection by RT-PCR in Russia, season 2020/21% positive

Weeks

  • H1pdm09H1pdm09
  • H3H3
  • BB
  • A (not subt.)A (not subt.)
  • % positive% positive
Fig. 6. Monitoring of ARVI detection by RT-PCR in Russia, season 2020/21
Number of positive casesFig. 6. Monitoring of ARVI detection by RT-PCR in Russia, season 2020/21

Weeks

  • PIVPIV
  • ADVADV
  • RSVRSV
  • RhVRhV
  • CoVCoV
  • MPVMPV
  • BoVBoV

ARVI detections. The overall proportion of respiratory samples tested positive for other ARVI (PIV, ADV, RSV, RhV, CoV, MPV, BoV) estimated as 7.3% of investigated samples by PCR.

Fig. 7. Monitoring of influenza viruses isolation in Russia, season 2020/21
Number of positive casesFig. 7. Monitoring of influenza viruses isolation in Russia, season 2020/21% positive

Weeks

  • H1pdm09H1pdm09
  • H3H3
  • BB
  • % positive% positive

Table 1. Results of influenza and other ARVI detection by RT-PCR in Russia, week 46 of 2020

  Number of  specimens / number of positive cases  % positive
Influenza
Number of specimens tested for influenza 2463 -
Influenza A (not subt.) 0 0,0%
Influenza A(H1)pdm09 0 0,0% 
Influenza A(H3) 0 0,0% 
Influenza B 0 0,0% 
All influenza 0 0,0%
Other ARVI
Number of specimens tested for ARVI 2237  -
PIV 36 1,6%
ADV 21 0,9%
RSV 6 0,3%
RhV 72 3,2%
CoV 5 0,2%
MPV 10 0,4%
BoV 13 0,6%
All ARVI 163 7,3%
SARS-CoV-2 (COVID-19)
Number of specimens tested for SARS-CoV-2 20088 -
SARS-CoV-2 4250 21,2%
Fig. 8. Results of PCR detections of SARS-CoV-2 in Russia
Fig. 8. Results of PCR detections of SARS-CoV-2 in Russia
% positive
  • No dataNo data
  • less then 10%less then 10%
  • 10-20%10-20%
  • 20-30%20-30%
  • 30-40%30-40%
  • 40-50%40-50%
  • 50% and more50% and more

COVID-2019. Totally 2 015 608 cases and 34 850 deaths associated with COVID-2019 were registered in Russia including 23 610 cases and 463 deaths in last 24 hours (on 12:00 of 19.11.2020). According to the data obtained by NIC in Saint-Petersburg totally 20 088 clinical samples were PCR investigated in last week. Among them coronavirus SARS-CoV-2 detected in 4250 (21.2%) cases.

Table 2. Results of influenza viruses isolation in Russia, week 46 of 2020

  Number of specimens / number of viruses  % isolated viruses
Number of specimens 199 -
Influenza A(H1)pdm09 0 0,0% 
Influenza A(H3) 0 0,0% 
Influenza B 0 0,0% 
All influenza 0 0,0%

Sentinel influenza surveillance

Clinical samples from 64 SARI patients were investigated by rRT-PCR for influenza, among them no influenza cases recognized. 50 SARI patients were investigated for ARVI by rRT-PCR, among them one (2.0%) case was positive for ADV infection. 6 (9.8%) of 61 SARI patients were positive for coronavirus SARS-CoV-2.

Clinical samples from 37 ILI/ARI patients were investigated for influenza and ARVI by rRT-PCR, among them no influenza cases recognized. 8 (27.6%) of 29 ILI/ARI cases were positive for ARVI, including one case of ADV and 7 RhV infection cases. 8 (4.2%) of 192 ILI/ARI patients were positive for SARS-CoV2. 

Fig. 9. Monitoring of influenza viruses detection by RT-PCR among SARI patients in sentinel hospitals, season 2020/21
Number of positive casesFig. 9. Monitoring of influenza viruses detection by RT-PCR among SARI patients in sentinel hospitals, season 2020/21% positive

Weeks

  • H1pdm09H1pdm09
  • H3H3
  • BB
  • A (not subt.)A (not subt.)
  • % positive% positive
Fig. 10. Monitoring of influenza viruses detection by RT-PCR among ILI/ARI patients in sentinel polyclinics, season 2020/21
Number of positive casesFig. 10. Monitoring of influenza viruses detection by RT-PCR among ILI/ARI patients in sentinel polyclinics, season 2020/21% positive

Weeks

  • H1pdm09H1pdm09
  • H3H3
  • BB
  • A (not subt.)A (not subt.)
  • % positive% positive
Fig. 11. Monitoring of ARVI detection by RT-PCR among SARI patients in sentinel hospitals, season 2020/21
Number of positive casesFig. 11. Monitoring of ARVI detection by RT-PCR among SARI patients in sentinel hospitals, season 2020/21

Weeks

  • PIVPIV
  • ADVADV
  • RSVRSV
  • RhVRhV
  • CoVCoV
  • MPVMPV
  • BoVBoV
Fig. 12. Monitoring of ARVI detection by RT-PCR among ILI/ARI patients in sentinel polyclinics, season 2020/21
Number of positive casesFig. 12. Monitoring of ARVI detection by RT-PCR among ILI/ARI patients in sentinel polyclinics, season 2020/21

Weeks

  • PIVPIV
  • ADVADV
  • RSVRSV
  • RhVRhV
  • CoVCoV
  • MPVMPV
  • BoVBoV
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