Epidemic Situation

Year: Week:


Week 29.10.2018-04.11.2018

Influenza and ARI morbidity data

Epidemiological data show decrease of influenza and other ARI activity in Russia in comparison with previous week. The nationwide ILI & ARI morbidity level (53.5 per 10 000 of population) was lower than the national baseline (72.6) by 26.3%.

ILI and ARI epidemic thresholds were not exceeded in all of 61 cities collaborating with two WHO NICs in Russia.

Exceeding of morbidity epidemic thresholds for overall population
 
- No data - less 20% - 20 - 49% - 50% and more


Cumulative number of diagnosed influenza cases

Cumulative results of influenza laboratory diagnosis by different tests were submitted by 51 RBLs and two WHO NICs. According to these data as a result of 2078 patients investigation one respiratory samples positive for influenza A(H1N1)pdm09 was detected

Results of influenza diagnosis
 
- No data
- No detection
- H1pdm09
- H1pdm09+H1
- H1pdm09+B
- H1pdm09+B+H1
- H1pdm09+H3
- H1pdm09+H3+H1
- H1pdm09+H3+B
- H1pdm09+H3+H1+B
- H1
- B
- B+H1
- H3
- H3+H1
- H3+B
- H3+H1+B


Influenza Virus Isolation



  - B - A(H1N1) - A(H3N2) - A(H1N1)pdm09  


Influenza Virus Antigen Detection by Immunofluorescence Assay (IFA)



  - B - A(H1N1) + A(H1N1)pdm09 - A(H3N2)  
  - PIV - AD - RS  


Influenza Virus RNA Detection by RT-PCR



  - B - A(H1N1) - A(H3N2) - A(H1N1)pdm09  
  - PIV - AD - RS    


Table 1. Influenza Virus Isolation
Base lab. Number of
investigated
patients
Number of viruses isolated
H1 H3 B H1pdm09 Untyped
virus
Total
BL of RII66000000
(%) 0,00,00,00,00,00,0
BL of IV0000000
(%) ------
TOTAL66000000
(%) 0,00,00,00,00,00,0

Table 2. Influenza Virus Antigen Detection by Immunofluorescence Assay (IFA)
Base lab. Number of
investigated
patients
Influenza Parainfluenza AD RS Total
H1+H1pdm09 H3 B I II III
BL of RII6420001118224238131
(%) 0,00,00,01,72,83,46,55,920,4
BL of IV1080004168423
(%) 0,00,00,03,70,95,67,43,721,3
TOTAL7500001519285042154
(%) 0,00,00,02,02,53,76,75,620,5

Table 3. Influenza Virus RNA Detection by RT-PCR
Base lab. Number of
investigated
patients
Influenza PIV AD RS
A
(not subtyped)
H1 H3 H5 B H1pdm09
BL of RII14740 / 14740 / 3900 / 5090 / 3410 / 14741 / 50143 / 90529 / 89812 / 898
(%) 0,00,00,00,00,00,24,83,21,3
BL of IV2020 / 2020 / 290 / 290 / 290 / 2020 / 299 / 1602 / 1610 / 161
(%) 0,00,00,00,00,00,05,61,20,0
TOTAL16760 / 16760 / 4190 / 5380 / 3700 / 16761 / 53052 / 106531 / 105912 / 1059
(%) 0,00,00,00,00,00,24,92,91,1

Table 4. Cumulative number of diagnosed influenza cases
Base lab. Number of
investigated
patients
Number of diagnosed influenza cases
H1 H1+H1pdm09
(IFA)
H3 A
(not subtyped)
B H1pdm09 Total
BL of RII18350000011
(%) 0,00,00,00,00,00,050,05
BL of IV2430000000
(%) 0,00,00,00,00,00,00,0
TOTAL20780000011
(%) 0,00,00,00,00,00,050,05

Conclusion

Influenza and ARI morbidity data.  Decreased influenza and other ARI activity was registered during the week 44.2018 in traditional surveillance system in Russia. The nationwide ILI & ARI morbidity level (53.5 per 10 000 of population) was lower than the national baseline by 26.3%.

Etiology of ILI & ARI morbidity. One respiratory samples tested positive for influenza A(H1N1)pdm09 was detected. Percent of positive ARI cases of non-influenza etiology (PIV, adeno- and RSV) was estimated as 20.5% of investigated patients by IFA and 8.9% by PCR. 

In sentinel surveillance system clinical samples from 85 SARI and ILI/ARI patients were investigated by rRT-PCR. No influenza case was detected.