Epidemic Situation

Year: Week:

NATIONAL WEEKLY INFLUENZA BULLETIN OF THE RUSSIAN FEDERATION

week 42 of 2020 (12.10.20 - 18.10.20)

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 (75.1 per 10 000 of population) was higher than national baseline (72.4) by 3.7%.

Etiology of ILI & ARI. Among 2036 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 12.1% (PCR).

In sentinel surveillance system clinical samples from 34 SARI and 24 ILI/ARI patients were investigated by rRT-PCR, among them no influenza cases recognized. Among 29 SARI cases 4 (13.8%) cases of RhV infection recognized. Among 24 ILI/ARI patients 3 (12.5%) cases were positive for ARVI, including 2 PIV and 1 CoV infection cases. 6 (20.0%) of 30 SARI and 1 (1.2%) of 85 ILI/ARI patients were positive for coronavirus SARS-CoV-2.

COVID-2019. Totally 1 463 306 cases and 25 242 deaths associated with COVID-2019 were registered in Russia including 15 971 cases and 290 deaths in last 24 hours (on 12:00 of 22.10.2020). According to the data obtained by NIC in Saint-Petersburg totally 17 289 clinical samples were PCR investigated in last week. Among them coronavirus SARS-CoV-2 detected in 2629 (15.2%) 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 (75.1 per 10 000 of population) was higher than national baseline (72.4) by 3.7%.

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 increased 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 dereased 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 46 RBLs and two WHO NICs. According to these data as a result of 2036 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 42 of 2020
Fig. 4. Geographic distribution of RT-PCR detected influenza viruses in cities under surveillance in Russia, week 42 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 12.1% 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 42 of 2020

  Number of  specimens / number of positive cases  % positive
Influenza
Number of specimens tested for influenza 2036 -
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 1631  -
PIV 15 0,9%
ADV 15 0,9%
RSV 2 0,1%
RhV 155 9,5%
CoV 3 0,2%
MPV 1 0,06%
BoV 6 0,4%
All ARVI 197 12,1%
SARS-CoV-2 (COVID-19)
Number of specimens tested for SARS-CoV-2 17289 -
SARS-CoV-2 2629 15,2%
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 1 463 306 cases and 25 242 deaths associated with COVID-2019 were registered in Russia including 15 971 cases and 290 deaths in last 24 hours (on 12:00 of 22.10.2020). According to the data obtained by NIC in Saint-Petersburg totally 17 289 clinical samples were PCR investigated in last week. Among them coronavirus SARS-CoV-2 detected in 2629 (15.2%) cases.

Table 2. Results of influenza viruses isolation in Russia, week 42 of 2020

  Number of specimens / number of viruses  % isolated viruses
Number of specimens 56 -
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 34 SARI patients were investigated by rRT-PCR for influenza, among them no influenza cases recognized. 29 SARI patients were investigated for ARVI by rRT-PCR, among them 4 (13.8%) cases were positive for RhV infection. 6 (20.0%) of 30 SARI patients were positive for coronavirus SARS-CoV-2.

Clinical samples from 24 ILI/ARI patients were investigated for influenza and ARVI by rRT-PCR, among them no influenza cases recognized. 3 (12.5%) of 24 ILI/ARI cases were positive for ARVI, including 2 PIV and 1 CoV infection cases. 1 (1.2%) of 85 ILI/ARI patients was 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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