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

Weeks
Morbidity 2020/21
Morbidity 2019/20
MEM 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%.

Weeks
Season 2020/21
Season 2019/20
MEM 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).

Weeks
Season 2020/21
Season 2019/20
MEM 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.

No data
No viruses detected
H1pdm09
H3
H3+H1pdm09
B
B+H1pdm09
B+H3
B+H3+H1pdm09
A (not subt.)
A (not subt.)+H1pdm09
A (not subt.)+H3
A (not subt.)+H3+H1pdm09
A (not subt.)+B
A (not subt.)+B+H1pdm09
A (not subt.)+B+H3
A (not subt.)+B+H3+H1pdm09

Weeks
H1pdm09
H3
B
A (not subt.)
% positive

Weeks
PIV
ADV
RSV
RhV
CoV
MPV
BoV
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.

Weeks
H1pdm09
H3
B
% 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% |

No data
less then 10%
10-20%
20-30%
30-40%
40-50%
50% 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.

Weeks
H1pdm09
H3
B
A (not subt.)
% positive

Weeks
H1pdm09
H3
B
A (not subt.)
% positive

Weeks
PIV
ADV
RSV
RhV
CoV
MPV
BoV

Weeks
PIV
ADV
RSV
RhV
CoV
MPV
BoV