Epidemic Situation

Year: Week:

NATIONAL WEEKLY INFLUENZA BULLETIN OF THE RUSSIAN FEDERATION

week 42 of 2022 (17.10.22 - 23.10.22)

Summary

Influenza and ARI incidence data. Influenza and other ARI activity decreased of influenza and other ARI activity in Russia in comparison with previous week. The nationwide ILI and ARI morbidity level (67.1 per 10 000 of population) was lower than national baseline (70.0) by 4.1%.

Etiology of ILI & ARI. Among 3200 patients investigation 4 (0.1%) respiratory samples positive for influenza, including 1 influenza unsubtyped A case in 1 city and 3 cases of influenza B in 2 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 19.8% (PCR).

In sentinel surveillance system clinical samples from 67 SARI patients were investigated by rRT-PCR for influenza, among them no positive cases recognized. 57 SARI patients were investigated for ARVI by rRT-PCR, among them 18 (36.1%) cases of ARVI recognized including 2 cases of PIV, 2 cases of AdV, 4 cases of RSV, 8 cases of RhV, 1 case of MPV and 1 case of BoV infection. 2 (3.2%) of 62 SARI patients were positive for coronavirus SARS-CoV-2.

Clinical samples from 44 ILI/ARI patients were investigated for influenza by rRT-PCR, among them no positive cases recognized. Among 33 ILI/ARI samples 8 (24.2%) cases positive for ARVI detected including 1 case of AdV, 6 cases of RSV infection and 1 case of CoV. 43 ILI/ARI patients were investigated for SARS-CoV-2 by rRT-PCR, among them 3 (7.0%) cases of coronavirus SARS-CoV-2 recognized.

COVID-19. Totally 21 394 360 cases and 389 790 deaths associated with COVID-19 were registered in Russia including 7 518 cases and 80 deaths in last 24 hours (on 12:00 of 26.10.2022). According to the data obtained by NIC in Saint-Petersburg totally 13 180 clinical samples were PCR investigated in last week. Among them coronavirus SARS-CoV-2 detected in 759 (5.8%) cases.

Influenza and ARI morbidity data

Fig. 1. Influenza and ARVI morbidity in 61 cities under surveillance in Russia, seasons 2021/22 and 2022/23
Rates per 10 000 populationFig. 1. Influenza and ARVI morbidity in 61 cities under surveillance in Russia, seasons 2021/22 and 2022/23

Weeks

  • Morbidity 2022/23Morbidity 2022/23
  • Morbidity 2021/22Morbidity 2021/22
  • MEM baseline 2022/23MEM baseline 2022/23

Epidemiological data showed decrease of influenza and other ARI activity in Russia in comparison with previous week. The nationwide ILI and ARI morbidity level (67.1 per 10 000 of population) was lower than national baseline (70.0) by 4.1%.

Fig. 2. Comparative data on incidence rate of clinically diagnosed influenza, seasons 2021/22 and 2022/23
Rates per 10 000 populationFig. 2. Comparative data on incidence rate of clinically diagnosed influenza, seasons 2021/22 and 2022/23

Weeks

  • Season 2022/23Season 2022/23
  • Season 2021/22Season 2021/22
  • MEM baselineMEM baseline

Incidence rate of clinically diagnosed influenza increased comparing to previous week and amounted to 0.0031 per 10 000 of population, it was much lower than pre-epidemic MEM baseline (0.060).

Fig. 3. Comparison of hospitalization rate with clinical diagnosis of influenza, seasons 2021/22 and 2022/23
Rates per 10 000 populationFig. 3. Comparison of hospitalization rate with clinical diagnosis of influenza, seasons 2021/22 and 2022/23

Weeks

  • Season 2022/23Season 2022/23
  • Season 2021/22Season 2021/22
  • MEM baselineMEM baseline

Hospitalization rate of clinically diagnosed influenza increased comparing to previous week and amounted to 0.0017 per 10 000 of population, it was much 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 3200 patients investigation 4 (0.1%) respiratory samples positive for influenza, including 1 case of A unsubtyped in 1 city and 3 cases of influenza B in 2 cities.

Fig. 4. Geographic distribution of RT-PCR detected influenza viruses in cities under surveillance in Russia, week 42 of 2022
Fig. 4. Geographic distribution of RT-PCR detected influenza viruses in cities under surveillance in Russia, week 42 of 2022
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 2022/23
Number of positive casesFig. 5. Monitoring of influenza viruses detection by RT-PCR in Russia, season 2022/23% 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 2022/23
Number of positive casesFig. 6. Monitoring of ARVI detection by RT-PCR in Russia, season 2022/23

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 19.8% of investigated samples by PCR.

Fig. 7. Monitoring of influenza viruses isolation in Russia, season 2022/23
Number of positive casesFig. 7. Monitoring of influenza viruses isolation in Russia, season 2022/23% positive

Weeks

  • H1pdm09H1pdm09
  • H3H3
  • BB
  • % positive% positive

Table 1. Results of influenza and other ARVI detection by RT-PCR in Russia, week 42 of 2022

  Number of  specimens / number of positive cases  % positive
Influenza
Number of specimens tested for influenza 3200 -
Influenza A (not subt.) 1 0,03%
Influenza A(H1)pdm09 0 0,0% 
Influenza A(H3) 0 0,0% 
Influenza B 3 0,09% 
All influenza 4 0,1%
Other ARVI
Number of specimens tested for ARVI 3085  -
PIV 79 2,6%
ADV 85 2,8%
RSV 70 2,3%
RhV 279 9,0%
CoV 13 0,4%
MPV 52 1,7%
BoV 33 1,1%
All ARVI 611 19,8%
SARS-CoV-2 (COVID-19)
Number of specimens tested for SARS-CoV-2 13180 -
SARS-CoV-2 759 5,8%
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-19. Totally 21 394 360 cases and 389 790 deaths associated with COVID-19 were registered in Russia including 7 518 cases and 80 deaths in last 24 hours (on 12:00 of 26.10.2022). According to the data obtained by NIC in Saint-Petersburg totally 13 180 clinical samples were PCR investigated in last week. Among them coronavirus SARS-CoV-2 detected in 759 (5.8%) cases.

Table 2. Results of influenza viruses isolation in Russia, week 42 of 2022

  Number of specimens / number of viruses  % isolated viruses
Number of specimens 51 -
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 67 SARI patients were investigated by rRT-PCR for influenza, among them no positive cases recognized. 57 SARI patients were investigated for ARVI by rRT-PCR, among them 18 (36.1%) cases of ARVI recognized including 2 cases of PIV, 2 cases of AdV, 4 cases of RSV, 8 cases of RhV, 1 case of MPV and 1 case of BoV infection. 2 (3.2%) of 62 SARI patients were positive for coronavirus SARS-CoV-2.

Clinical samples from 44 ILI/ARI patients were investigated for influenza by rRT-PCR, among them no positive cases recognized. Among 33 ILI/ARI samples 8 (24.2%) cases positive for ARVI detected including 1 case of AdV, 6 cases of RSV infection and 1 case of CoV. 43 ILI/ARI patients were investigated for SARS-CoV-2 by rRT-PCR, among them 3 (7.0%) cases of coronavirus SARS-CoV-2 recognized.

Fig. 9. Monitoring of influenza viruses detection by RT-PCR among SARI patients in sentinel hospitals, season 2022/23
Number of positive casesFig. 9.  Monitoring of influenza viruses detection by RT-PCR among SARI patients in sentinel hospitals, season 2022/23% 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 2022/23
Number of positive casesFig. 10.  Monitoring of influenza viruses detection by RT-PCR among ILI/ARI patients in sentinel polyclinics, season 2022/23% 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 2022/23
Number of positive casesFig. 11.  Monitoring of ARVI detection by RT-PCR among SARI patients in sentinel hospitals, season 2022/23

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 2022/23
Number of positive casesFig. 12.  Monitoring of ARVI detection by RT-PCR among ILI/ARI patients in sentinel polyclinics, season 2022/23

Weeks

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