Epidemic Situation

Year: Week:

NATIONAL WEEKLY INFLUENZA BULLETIN OF THE RUSSIAN FEDERATION

week 1 of 2021 (04.01.21 - 10.01.21)

Summary

Influenza and ARI incidence data. Decrease of influenza and other ARI activity in Russia in comparison with previous week. The nationwide ILI and ARI morbidity level (39.6 per 10 000 of population) was lower than national baseline (70.04) by 43.4%.

Etiology of ILI & ARI. Among 1534 investigated patients 3 (0.2%) respiratory samples were positive for influenza in 1 city including one influenza A(H3N2) case, one unsubtiped influenza A case and one influenza type B case.

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 5.9% (PCR).

In sentinel surveillance system clinical samples from 12 SARI and 10 ILI/ARI patients were investigated by rRT-PCR, among them no influenza cases recognized. Among 12 SARI patients no cases were positive for ARVI. Among 10 ILI/ARI patients 3 (30.0%) cases were positive for ADV infection. One (8.3%) of 12 SARI cases was positive for coronavirus SARS-CoV-2. Among 10 ILI/ARI patients no cases positive for coronavirus SARS-CoV-2 recognized.

COVID-2019. Totally 3 495 816 cases and 63 940 deaths associated with COVID-2019 were registered in Russia including 24 763 cases and 570 deaths in last 24 hours (on 12:00 of 14.01.2021). According to the data obtained by NIC in Saint-Petersburg totally 8965 clinical samples were PCR investigated in last week. Among them coronavirus SARS-CoV-2 detected in 2785 (31.1%) 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 (39.6 per 10 000 of population) was lower than national baseline (70.04) by 43.4%.

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 0.0011 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 0.00018 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 39 RBLs and two WHO NICs. According to these data as a result of 1534 patients investigation 3 (0.2%) respiratory samples positive for influenza were detected by PCR in one city including one influenza A(H3N2) case, one unsubtiped influenza A case and one influenza type B case.

Fig. 4. Geographic distribution of RT-PCR detected influenza viruses in cities under surveillance in Russia, week 1 of 2021
Fig. 4. Geographic distribution of RT-PCR detected influenza viruses in cities under surveillance in Russia, week 1 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 5.9% 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 1 of 2021

  Number of  specimens / number of positive cases  % positive
Influenza
Number of specimens tested for influenza 1534 -
Influenza A (not subt.) 1 0,07%
Influenza A(H1)pdm09 0 0,0% 
Influenza A(H3) 1 0,07% 
Influenza B 1 0,07% 
All influenza 3 0,2%
Other ARVI
Number of specimens tested for ARVI 1345  -
PIV 15 1,1%
ADV 10 0,7%
RSV 2 0,1%
RhV 32 2,4%
CoV 12 0,9%
MPV 5 0,4%
BoV 4 0,3%
All ARVI 80 5,9%
SARS-CoV-2 (COVID-19)
Number of specimens tested for SARS-CoV-2 8965 -
SARS-CoV-2 2785 31,1%
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 3 495 816 cases and 63 940 deaths associated with COVID-2019 were registered in Russia including 24 763 cases and 570 deaths in last 24 hours (on 12:00 of 14.01.2021). According to the data obtained by NIC in Saint-Petersburg totally 8965 clinical samples were PCR investigated in last week. Among them coronavirus SARS-CoV-2 detected in 2785 (31.1%) cases.

Table 2. Results of influenza viruses isolation in Russia, week 1 of 2021

  Number of specimens / number of viruses  % isolated viruses
Number of specimens 7 -
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 12 SARI patients were investigated by rRT-PCR for influenza, among them no influenza cases recognized. 12 SARI patients were investigated for ARVI by rRT-PCR, among them no cases were positive for ARVI. One (8.3%) of 12 SARI patients was positive for coronavirus SARS-CoV-2.

Clinical samples from 10 ILI/ARI patients were investigated for influenza and ARVI by rRT-PCR, among them no influenza cases recognized. 3 (30.0%) of 10 ILI/ARI cases were positive for ADV infection. 10 ILI/ARI patients were investigated for SARS-CoV2 among them no SARS-CoV2 cases recognized.

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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