Epidemic Situation

Year: Week:

NATIONAL WEEKLY INFLUENZA BULLETIN OF THE RUSSIAN FEDERATION

week 41 of 2022 (10.10.22 - 16.10.22)

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 (68.2 per 10 000 of population) was lower than national baseline (70.0) by 2.6%.

Etiology of ILI & ARI. Among 2738 patients investigation 3 (0.1%) respiratory samples positive for influenza, including 2 cases of influenza А(H1N1)pdm09 in 2 cities and 1 case of influenza A(H3N2) in 1 city. 

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 17.1% (PCR).

In sentinel surveillance system Clinical samples from 58 SARI patients were investigated by rRT-PCR for influenza, among them 1 (1.8%) case of influenza А(H1N1)pdm09 recognized. 47 SARI patients were investigated for ARVI by rRT-PCR, among them 5 (10.6%) cases of ARVI recognized including one case of RSV and 4 cases of RhV infection. 2 (3.5%) of 57 SARI patients were positive for coronavirus SARS-CoV-2.

Clinical samples from 39 ILI/ARI patients were investigated for influenza by rRT-PCR, among them no positive cases recognized. Among 30 ILI/ARI samples 10 (33.3%) cases positive for ARVI detected including 2 cases of PIV, 1 case of ADV, 4 cases of RhV infection, 1 case of CoV and 2 cases of MPV. 39 ILI/ARI patients were investigated for SARS-CoV-2 by rRT-PCR, among them 2 (5.1%) cases of coronavirus SARS-CoV-2 recognized.

COVID-19. Totally 21 335 087 cases and 389 176 deaths associated with COVID-19 were registered in Russia including 10 656 cases and 92 deaths in last 24 hours (on 12:00 of 19.10.2022). According to the data obtained by NIC in Saint-Petersburg totally 14 043 clinical samples were PCR investigated in last week. Among them coronavirus SARS-CoV-2 detected in 1617 (11.5%) 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 (68.2 per 10 000 of population) was lower than national baseline (70.0) by 2.6%.

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 decreased comparing to previous week and amounted to 0.0015 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 0.00092 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 2738 patients investigation 3 (0.1%) respiratory samples positive for influenza, including 2 cases of influenza А(H1N1)pdm09 in 2 cities and 1 case of influenza A(H3N2) in 1 city.

Fig. 4. Geographic distribution of RT-PCR detected influenza viruses in cities under surveillance in Russia, week 41 of 2022
Fig. 4. Geographic distribution of RT-PCR detected influenza viruses in cities under surveillance in Russia, week 41 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 17.1% 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 41 of 2022

  Number of  specimens / number of positive cases  % positive
Influenza
Number of specimens tested for influenza 2738 -
Influenza A (not subt.) 0 0,0%
Influenza A(H1)pdm09 2 0,07% 
Influenza A(H3) 1 0,04% 
Influenza B 0 0,0% 
All influenza 3 0,1%
Other ARVI
Number of specimens tested for ARVI 2715  -
PIV 80 2,9%
ADV 49 1,8%
RSV 50 1,8%
RhV 242 8,9%
CoV 4 0,1%
MPV 21 0,8%
BoV 19 0,7%
All ARVI 465 17,1%
SARS-CoV-2 (COVID-19)
Number of specimens tested for SARS-CoV-2 14043 -
SARS-CoV-2 1617 11,5%
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 21 335 087 cases and 389 176 deaths associated with COVID-19 were registered in Russia including 10 656 cases and 92 deaths in last 24 hours (on 12:00 of 19.10.2022). According to the data obtained by NIC in Saint-Petersburg totally 14 043 clinical samples were PCR investigated in last week. Among them coronavirus SARS-CoV-2 detected in 1617 (11.5%) cases.

Table 2. Results of influenza viruses isolation in Russia, week 41 of 2022

  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 58 SARI patients were investigated by rRT-PCR for influenza, among them 1 (1.8%) case of influenza А(H1N1)pdm09 recognized. 47 SARI patients were investigated for ARVI by rRT-PCR, among them 5 (10.6%) cases of ARVI recognized including one case of RSV and 4 cases of RhV infection. 2 (3.5%) of 57 SARI patients were positive for coronavirus SARS-CoV-2.

Clinical samples from 39 ILI/ARI patients were investigated for influenza by rRT-PCR, among them no positive cases recognized. Among 30 ILI/ARI samples 10 (33.3%) cases positive for ARVI detected including 2 cases of PIV, 1 case of ADV, 4 cases of RhV infection, 1 case of CoV and 2 cases of MPV. 39 ILI/ARI patients were investigated for SARS-CoV-2 by rRT-PCR, among them 2 (5.1%) 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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