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Epidemic Situation

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NATIONAL WEEKLY INFLUENZA BULLETIN OF THE RUSSIAN FEDERATION

week 7 of 2021 (15.02.21 - 21.02.21)

Summary

Influenza and ARI incidence data. Influenza and other ARI activity decreased in Russia in comparison with previous week. The nationwide ILI and ARI morbidity level (69.7 per 10 000 of population) was lower than national baseline (70.04) by 0.4%.

Etiology of ILI & ARI. Among 3296 investigated patients 3 (0.09%) respiratory samples positive for influenza were detected in two cities including one influenza A(H1N1)pdm09 case in one city, one influenza A unsubtyped case and one influenza type B case in one 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 17.5% (PCR).

In sentinel surveillance system clinical samples from 60 SARI and 112 ILI/ARI patients were investigated by rRT-PCR, among them no influenza cases recognized. Among 40 SARI patients 12 (30.0%) cases were positive for ARVI, including 2 cases of PIV, 2 cases of ADV, 2 cases of RSV, 3 cases of RhV, 2 cases of MPV and one case of BoV infection. Among 97 ILI/ARI patients 21 (21.6%) cases were positive for ARVI, including 4 cases of PIV, 4 cases of  ADV, one case of RSV, 3 cases of RhV, 6 cases of CoV and 3 cases of MPV infection. 4 (6.7%) of 60 SARI cases were positive for coronavirus SARS-CoV-2. Among 110 ILI/ARI patients 3 (2.7%) cases positive for coronavirus SARS-CoV-2 recognized.

COVID-2019. Totally 4 223 186 cases and 85 304 deaths associated with COVID-2019 were registered in Russia including 11 086 cases and 428 deaths in last 24 hours (on 12:00 of 26.02.2021). According to the data obtained by NIC in Saint-Petersburg totally 10446 clinical samples were PCR investigated in last week. Among them coronavirus SARS-CoV-2 detected in 1610 (15.4%) 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 decrease of influenza and other ARI activity in Russia in comparison with previous week. The nationwide ILI and ARI morbidity level (69.7 per 10 000 of population) was lower than national baseline (70.04) by 0.4%.

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 0.00074 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 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 increased comparing to previous week and amounted to 0.00055 per 10 000 of population, it was significantly lower than pre-epidemic MEM baseline (0.040).

Influenza and ARVI laboratory testing results

Cumulative results of influenza laboratory diagnosis by rRT-PCR were submitted by 45 RBLs and two WHO NICs. According to these data as a result of 3296 patients investigation 3 (0.09%) respiratory samples positive for influenza were detected in two cities including one influenza A(H1N1)pdm09 case in one city, and one unsubtyped influenza A case and one influenza type B case in other city.

Fig. 4. Geographic distribution of RT-PCR detected influenza viruses in cities under surveillance in Russia, week 7 of 2021
Fig. 4. Geographic distribution of RT-PCR detected influenza viruses in cities under surveillance in Russia, week 7 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 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 17.5% 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 7 of 2021

  Number of  specimens / number of positive cases  % positive
Influenza
Number of specimens tested for influenza 3296 -
Influenza A (not subt.) 1 0,03%
Influenza A(H1)pdm09 1 0,03% 
Influenza A(H3) 0 0,0% 
Influenza B 1 0,03% 
All influenza 3 0,09%
Other ARVI
Number of specimens tested for ARVI 3131  -
PIV 47 1,5%
ADV 36 1,1%
RSV 16 0,5%
RhV 168 5,4%
CoV 154 4,9%
MPV 92 2,9%
BoV 36 1,1%
All ARVI 549 17,5%
SARS-CoV-2 (COVID-19)
Number of specimens tested for SARS-CoV-2 10446 -
SARS-CoV-2 1610 15,4%
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 4 223 186 cases and 85 304 deaths associated with COVID-2019 were registered in Russia including 11 086 cases and 428 deaths in last 24 hours (on 12:00 of 26.02.2021). According to the data obtained by NIC in Saint-Petersburg totally 10446 clinical samples were PCR investigated in last week. Among them coronavirus SARS-CoV-2 detected in 1610 (15.4%) cases.

Table 2. Results of influenza viruses isolation in Russia, week 7 of 2021

  Number of specimens / number of viruses  % isolated viruses
Number of specimens 15 -
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 60 SARI patients were investigated by rRT-PCR for influenza, among them no influenza cases recognized. 40 SARI patients were investigated for ARVI by rRT-PCR, among them 12 (30.0%) cases were positive for ARVI, including 2 cases of PIV, 2 cases of ADV, 2 cases of RSV, 3 cases of RhV, 2 cases of MPV and one case of BoV infection. 4 (6.7%) of 60 SARI patients were positive for coronavirus SARS-CoV-2.

Clinical samples from 112 ILI/ARI patients were investigated for influenza and ARVI by rRT-PCR, among them no influenza cases recognized. 21 (21.6%) of 97 ILI/ARI cases were positive for ARVI, including 4 cases of PIV, 4 cases of  ADV, one case of RSV, 3 cases of RhV, 6 cases of CoV and 3 cases of MPV infection. 3 (2.7%) of 110 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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