Epidemic Situation

Year: Week:

NATIONAL WEEKLY INFLUENZA BULLETIN OF THE RUSSIAN FEDERATION

week 40 of 2021 (04.10.21 - 10.10.21)

Summary

Influenza and ARI incidence data. Influenza and other ARI activity slightly increased in Russia in comparison with previous week. The nationwide ILI and ARI morbidity level (92.6 per 10 000 of population) was higher than national baseline (70.0) by 32.3%.

Etiology of ILI & ARI. Among 2986 investigated patients 8 (0.3%) respiratory samples positive for influenza A(H3N2) detected in five cities.

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 21.0% (PCR).

In sentinel surveillance system clinical samples from 48 SARI and 72 ILI/ARI patients were investigated by rRT-PCR, among them no influenza cases recognized. Among 37 SARI patients 8 (21.6%) cases were positive for ARVI, including 4 cases of RSV, 2 cases of RhV and 2 cases of BoV infection. Among 33 ILI/ARI patients 6 (18.2%) cases were positive for ARVI, including 3 cases of RSV and 3 cases of RhV infection. 13 (31.0%) of 42 SARI cases were positive for coronavirus SARS-CoV-2. Among 51 ILI/ARI patients 20 (39.2%) cases positive for coronavirus SARS-CoV-2 recognized.

COVID-2019. Totally 7 892 980 cases and 220 315 deaths associated with COVID-2019 were registered in Russia including 31 299 cases and 986 deaths in last 24 hours (on 12:00 of 14.10.2021). According to the data obtained by NIC in Saint-Petersburg totally 16849 clinical samples were PCR investigated in last week. Among them coronavirus SARS-CoV-2 detected in 3971 (23.6%) cases.

Influenza and ARI morbidity data

Fig. 1. Influenza and ARVI morbidity in 61 cities under surveillance in Russia, seasons 2020/21 and 2021/22
Rates per 10 000 populationFig. 1. Influenza and ARVI morbidity in 61 cities under surveillance in Russia, seasons 2020/21 and 2021/22

Weeks

  • Morbidity 2021/22Morbidity 2021/22
  • Morbidity 2020/21Morbidity 2020/21
  • MEM baseline 2021/22MEM baseline 2021/22

Epidemiological data showed slight increase of influenza and other ARI activity in Russia in comparison with previous week. The nationwide ILI and ARI morbidity level (92.6 per 10 000 of population) was higher than national baseline (70.0) by 32.3%.

Fig. 2. Comparative data on incidence rate of clinically diagnosed influenza, seasons 2020/21 and 2021/22
Rates per 10 000 populationFig. 2. Comparative data on incidence rate of clinically diagnosed influenza, seasons 2020/21 and 2021/22

Weeks

  • Season 2021/22Season 2021/22
  • Season 2020/21Season 2020/21
  • MEM baselineMEM baseline

Incidence rate of clinically diagnosed influenza increased comparing to previous week and amounted to 0.0073 per 10 000 of population, it was significantly lower than pre-epidemic MEM baseline (0.060).

Fig. 3. Comparison of hospitalization rate with clinical diagnosis of influenza, seasons 2020/21 and 2021/22
Rates per 10 000 populationFig. 3. Comparison of hospitalization rate with clinical diagnosis of influenza, seasons 2020/21 and 2021/22

Weeks

  • Season 2021/22Season 2021/22
  • Season 2020/21Season 2020/21
  • MEM baselineMEM baseline

Hospitalization rate of clinically diagnosed influenza increased comparing to previous week and amounted to 0.0037 per 10 000 of population, it was significantly lower than pre-epidemic MEM baseline (0.040).

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 2986 patients investigation 8 (0.3%) respiratory samples positive for influenza A(H3N2) were detected in five cities.

Fig. 4. Geographic distribution of RT-PCR detected influenza viruses in cities under surveillance in Russia, week 40 of 2021
Fig. 4. Geographic distribution of RT-PCR detected influenza viruses in cities under surveillance in Russia, week 40 of 2021
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
  • A (not subt.)A (not subt.)
  • A (not subt.)+H1pdm09A (not subt.)+H1pdm09
  • A (not subt.)+H3A (not subt.)+H3
  • A (not subt.)+H3+H1pdm09A (not subt.)+H3+H1pdm09
  • A (not subt.)+BA (not subt.)+B
  • A (not subt.)+B+H1pdm09A (not subt.)+B+H1pdm09
  • A (not subt.)+B+H3A (not subt.)+B+H3
  • A (not subt.)+B+H3+H1pdm09A (not subt.)+B+H3+H1pdm09
Fig. 5. Monitoring of influenza viruses detection by RT-PCR in Russia, season 2021/22
Number of positive casesFig. 5. Monitoring of influenza viruses detection by RT-PCR in Russia, season 2021/22% 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 2021/22
Number of positive casesFig. 6. Monitoring of ARVI detection by RT-PCR in Russia, season 2021/22

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 21.0% of investigated samples by PCR.

Fig. 7. Monitoring of influenza viruses isolation in Russia, season 2021/22
Number of positive casesFig. 7. Monitoring of influenza viruses isolation in Russia, season 2021/22% positive

Weeks

  • H1pdm09H1pdm09
  • H3H3
  • BB
  • % positive% positive

Table 1. Results of influenza and other ARVI detection by RT-PCR in Russia, week 40 of 2021

  Number of  specimens / number of positive cases  % positive
Influenza
Number of specimens tested for influenza 2986 -
Influenza A (not subt.) 0 0,0%
Influenza A(H1)pdm09 0 0,0% 
Influenza A(H3) 8 0,3% 
Influenza B 0 0,0% 
All influenza 8 0,3%
Other ARVI
Number of specimens tested for ARVI 2745  -
PIV 34 1,2%
ADV 35 1,3%
RSV 182 6,6%
RhV 283 10,3%
CoV 5 0,2%
MPV 7 0,3%
BoV 30 1,1%
All ARVI 576 21,0%
SARS-CoV-2 (COVID-19)
Number of specimens tested for SARS-CoV-2 16849 -
SARS-CoV-2 3971 23,6%
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 7 892 980 cases and 220 315 deaths associated with COVID-2019 were registered in Russia including 31 299 cases and 986 deaths in last 24 hours (on 12:00 of 14.10.2021). According to the data obtained by NIC in Saint-Petersburg totally 16849 clinical samples were PCR investigated in last week. Among them coronavirus SARS-CoV-2 detected in 3971 (23.6%) cases.

Table 2. Results of influenza viruses isolation in Russia, week 40 of 2021

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

Sentinel influenza surveillance

Clinical samples from 48 SARI patients were investigated by rRT-PCR for influenza, among them no influenza cases recognized. 37 SARI patients were investigated for ARVI by rRT-PCR, among them 8 (21.6%) cases were positive for ARVI, including 4 cases of RSV, 2 cases of RhV and 2 cases of BoV infection. 13 (31.0%) of 42 SARI patients were positive for coronavirus SARS-CoV-2.

Clinical samples from 72 ILI/ARI patients were investigated for influenza and ARVI by rRT-PCR, among them no influenza cases recognized. 6 (18.2%) of 33 ILI/ARI cases were positive for ARVI, including 3 cases of RSV and 3 cases of RhV infection. 20 (39.2%) of 51 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 2021/22
Number of positive casesFig. 9.  Monitoring of influenza viruses detection by RT-PCR among SARI patients in sentinel hospitals, season 2021/22% 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 2021/22
Number of positive casesFig. 10.  Monitoring of influenza viruses detection by RT-PCR among ILI/ARI patients in sentinel polyclinics, season 2021/22% 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 2021/22
Number of positive casesFig. 11.  Monitoring of ARVI detection by RT-PCR among SARI patients in sentinel hospitals, season 2021/22

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 2021/22
Number of positive casesFig. 12.  Monitoring of ARVI detection by RT-PCR among ILI/ARI patients in sentinel polyclinics, season 2021/22

Weeks

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