British Columbia Influenza Surveillance Bulletin 2010-11 Weeks 16-17

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Re: British Columbia Influenza Surveillance Bulletin 2010-11 Weeks 16-17

BRITISH COLUMBIA INFLUENZA SURVEILLANCE BULLETIN 2010-11: Number 21, Weeks 16-17 April 17 to 30, 2011


Sporadic Detections of Influenza in BC

Summary

During weeks 16-17 (April 17 - 30, 2011), all influenza surveillance indicators suggest low level influenza activity in BC. The sentinel physician ILI rate was low and within the expected range for this time of year and similar to that reported in previous weeks. MSP influenza visits were also stable at low levels. One school ILI outbreak was reported in which rhinovirus was detected. Influenza was detected in a very small proportion of submitted specimens (4.0%, 7 out of 173). Of 173 specimens tested for other respiratory viruses, 46 (26.6%) were positive for rhino/enterovirus, 13 (7.5%) for RSV, and 11 (6.4%) for parainfluenza. Other respiratory viruses were also sporadically detected.

Please note that this will be the last regular bulletin of the 2010-11 influenza reporting period.
We will continue to monitor the usual activity indicators but further bulletins through the summer will be issued on an as-needed basis only,
until we resume regular reporting for the 2011-12 influenza season.

Full report:
http://www.bccdc.ca/NR/rdonlyres/368...617_201011.pdf

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Re: British Columbia Influenza Surveillance Bulletin 2010-11 Weeks 14-15

BRITISH COLUMBIA INFLUENZA SURVEILLANCE BULLETIN 2010-11: Number 20, Weeks 14-15 April 3 to 16, 2011

Influenza Activity in BC: Stable at Low Levels

Summary

During weeks 14-15 (April 3 ? April 16, 2011), all influenza surveillance indicators in BC were maintained at low level. The sentinel physician ILI rate was below the expected level for this time of year and was similarly low to that reported in previous weeks 12-13. MSP influenza visits were also stable at low levels. Two schools reported ILI outbreaks but no laboratory confirmed ILI outbreaks were reported. Influenza was detected in a minority (5.7%) of submitted specimens (14 of 162 in week 14 and 2 of 117 in week 15). Influenza A/H3N2 and B were detected sporadically in most HAs; pandemic A/H1N1 was detected in Fraser HA only during this period. Of 279 specimens tested for other respiratory viruses during weeks 14-15, 39 (14.0%) were positive for RSV, 14 (5.0%) for coronavirus, and 46 (16.5%) for rhino/enterovirus. Other respiratory viruses were also sporadically detected.

Full report:

http://www.bccdc.ca/NR/rdonlyres/34970BCA-F0B8-4BBB-9A29-24DC5369FE1B/0/InfluBulletin_Number20_Weeks1415_201011.pdf

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Re: British Columbia Influenza Surveillance Bulletin 2010-11 Weeks 12-13

BRITISH COLUMBIA INFLUENZA SURVEILLANCE BULLETIN 2010-11: Number 19, Weeks 12-13 March 20 to April 2, 2011

Influenza Activity in BC Continues to Decline

Summary

During weeks 12-13 (March 20 ? April 2, 2011), influenza surveillance indicators in BC continued a general pattern of decline seen in previous weeks. The sentinel physician ILI rate continued to decrease over the previous week and was also below the expected level for this time of year. MSP influenza visits were still higher than usually observed at this time of year, but showed indication of decline from previous weeks. No outbreaks were reported from facilities or schools. Pandemic influenza A/H1N1, A/H3N2, and B were detected sporadically throughout the province during this period. Pandemic influenza A/H1N1 and influenza B were sporadically detected in all five HAs, while A/H3N2 was detected in all HAs except Northern. Of 391 specimens tested for other respiratory viruses during weeks 12-13, 51 (13.0%) were positive for RSV, 25 (6.4%) for coronavirus, and 47 (12.0%) for rhino/enterovirus. Other respiratory viruses were also sporadically detected.

Full report:
http://www.bccdc.ca/NR/rdonlyres/A99...213_201011.pdf

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Re: British Columbia Influenza Surveillance Bulletin 2010-11 Week 11

BRITISH COLUMBIA INFLUENZA SURVEILLANCE BULLETIN

2010-11: Number 18, Week 11 March 13 to 19, 2011

Declining Influenza Activity in BC

Summary

During week 11 (March 13 - 19, 2011), influenza surveillance indicators in BC were higher than usual for this time of year but showed a general pattern of decline from previous weeks. The sentinel physician ILI rate significantly decreased over the previous week and was also below the expected level for this time of year. MSP influenza visits also showed indication of decline from previous weeks but were still higher than usually observed at this time of year. Five outbreaks of influenza B (including one where pandemic influenza A/H1N1 was also detected) were reported from schools in Northern HA. Two influenza-positive outbreaks were reported from long-term care facilities (LTCF) during week 11, one from Vancouver Island (influenza A, subtype pending) and one from Interior (influenza B). Pandemic influenza A/H1N1, A/H3N2, and B were detected sporadically throughout the province. Influenza A/H3N2 detections were predominantly from Vancouver Island, while Fraser was the main source of community influenza B detections. At the BC Public Health Microbiology & Reference Laboratory, 285 respiratory specimens were tested for influenza. Influenza was detected in 67 (24%) specimens: pandemic influenza A/H1N1 in 12 (4%), A/H3N2 in 15 (5%), unsubtyped influenza A in 4 (1%), and influenza B in 36 (13%) specimens. Of 285 specimens tested for other respiratory viruses, 47 (17%) RSV, 23 (8%) coronavirus, and 21 (7%) rhino/enterovirus were detected.

Full report:
http://www.bccdc.ca/NR/rdonlyres/01A...k11_201011.pdf

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Re: British Columbia Influenza Surveillance Bulletin 2010-11 Week 10

BRITISH COLUMBIA INFLUENZA SURVEILLANCE BULLETIN 2010-11: Number 17, Week 10 March 6 to March 12, 2011

Continued Elevated Influenza Activity in BC

Summary

During week 10 (March 6 ? March 12, 2011), influenza surveillance indicators in BC remained elevated. The sentinel physician ILI rate decreased slightly over the past week, but MSP influenza visits were generally higher over the previous week or remained elevated overall and across all regions (though level of increase differed by region). One pandemic influenza A/H1N1 outbreak was reported in an adult residential facility. Pandemic influenza A/H1N1, A/H3N2, and B were detected sporadically throughout the province, though detections varied by region being higher in Fraser and Vancouver Island Health Authorities. At the BC Public Health Microbiology & Reference Laboratory, 237 respiratory specimens were tested. Influenza was detected in 75 (32%) specimens: pandemic influenza A/H1N1 in 17 (7%), A/H3N2 in 26 (11%), unsubtyped influenza A in 7 (3%), and influenza B in 25 (10%) specimens. Of 237 specimens tested, other respiratory viruses found included: 34 (14%) RSV, 19 (8%) coronavirus, and 15 (6%) rhino/enterovirus.

Full report:
http://www.bccdc.ca/NR/rdonlyres/828...k10_201011.pdf

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Re: British Columbia Influenza Surveillance Bulletin 2010-11 Week 9

BRITISH COLUMBIA INFLUENZA SURVEILLANCE BULLETIN 2010-11: Number 16, Week 9 February 27 to March 5, 2011

Increase in BC influenza activity

Summary

During week 9 (February 27 ? March 5, 2011), influenza surveillance indicators in BC (sentinel physician ILI rate and MSP influenza visits) showed further overall increase. Four long-term care and one adult residential facility influenza A outbreaks were reported (3 A/H3N2, one pandemic influenza A/H1N1, and one subtype pending). Both influenza B and pandemic H1N1 were identified in one school outbreak. At the BC Public Health Microbiology & Reference Laboratory, 271 respiratory specimens were tested. Influenza was detected in 67 (25%) specimens: pandemic influenza A/H1N1 in 6 (2%), A/H3N2 in 25 (9%), unsubtyped influenza A in 16 (6%), and influenza B in 20 (7%) specimens. Of 271 specimens tested, other respiratory viruses found were: 37 (14%) RSV, 19 (7%) coronavirus, and 17 (6%) rhino/enterovirus.

Full report:
http://www.bccdc.ca/NR/rdonlyres/36B...k09_201011.pdf

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Re: British Columbia Influenza Surveillance Bulletin 2010-11 Week 8

BRITISH COLUMBIA INFLUENZA SURVEILLANCE BULLETIN 2010-11: Number 15, Week 8 February 20 to 26, 2011

Overall activity still low despite regional upswing in ILI and H3N2 facility outbreak detection

Summary

During week 8 (February 20 ? 26, 2011), influenza surveillance indicators in BC (sentinel physician ILI rate and MSP influenza visits) showed that overall activity remained below the expected level for this time of year, with regional upswings along with a surge in influenza A positive long term care facility outbreaks. Five long term care facility influenza A positive outbreaks (four A/H3N2; one as yet unsubtyped) were reported; three from VIHA and two from FHA, compared to none in previous weeks. At the BC Public Health Microbiology & Reference Laboratory, 227 respiratory specimens were tested. Influenza was detected in 55 (24%) specimens: pandemic influenza A/H1N1 in 6 (3%), A/H3N2 in 19 (8%), unsubtyped influenza A in 17 (7%), and influenza B in 13 (6%) specimens. Of 227 specimens tested, other respiratory viruses detected included 36 (16%) RSV, 21 (9%) rhino/enterovirus and 17 (8%) coronavirus.

Full report:
http://www.bccdc.ca/NR/rdonlyres/11F...k08_201011.pdf

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Re: British Columbia Influenza Surveillance Bulletin 2010-11 Week 7

BRITISH COLUMBIA INFLUENZA SURVEILLANCE BULLETIN 2010-11: Number 14, Week 7 February 13 to 19, 2011

Overall low-level activity:

some regional upswing in ILI with H3N2 facility outbreak detection

Summary

During week 7 (February 13 ? 19, 2011), influenza surveillance indicators in BC (sentinel physician ILI rate and MSP influenza visits) showed that overall activity remained low with some increase in activity across Interior and Vancouver Island Health Authorities. Two long term care facility A/H3N2 positive outbreaks were reported; one from VIHA and one from IHA. At the BC Public Health Microbiology & Reference Laboratory, 227 respiratory specimens were tested. Influenza was detected in 42 (19%) specimens: pandemic influenza A/H1N1 in 12 (5%), A/H3N2 in 13 (6%), unsubtyped influenza A in 5 (2%), and influenza B in 12 (5%) specimens. Of 227 specimens tested, other respiratory viruses detected included 32 (14%) RSV, 21 (9%) rhino/enterovirus and 17 (8%) coronavirus.

Full report:
http://www.bccdc.ca/NR/rdonlyres/49F...k07_201011.pdf

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Re: British Columbia Influenza Surveillance Bulletin 2010-11 Week 6

BRITISH COLUMBIA INFLUENZA SURVEILLANCE BULLETIN
2010-11: Number 13, Week 6 February 6 to 12, 2011

Low level mix of influenza viruses detected in BC


Summary

During week 6 (February 6 ? 12, 2011), influenza surveillance indicators in BC (sentinel physician ILI rate and MSP influenza visits) were consistent with those of the previous reporting week, remaining below historic levels for this time of year. At the BC Public Health Microbiology & Reference Laboratory, 204 respiratory specimens were tested. Influenza was detected in 40 (20%) specimens: pandemic influenza A/H1N1 in 9 (4%), A/H3N2 in 9 (4%), unsubtyped influenza A in 12 (6%), and influenza B in 10 (5%) specimens. Of 204 specimens tested, other respiratory viruses detected included 26 (13%) RSV, 19 (9%) rhino/enterovirus and 17 (8%) coronavirus.

Full report:
http://www.bccdc.ca/NR/rdonlyres/A06...k06_201011.pdf

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Re: British Columbia Influenza Surveillance Bulletin 2010-11 Week 5

BRITISH COLUMBIA INFLUENZA SURVEILLANCE BULLETIN 2010-11: Number 12, Week 5 January 30 to February 5, 2011


Low level mix of influenza viruses detected in BC

Summary

During week 5 (January 30 ? February 5, 2011), influenza surveillance indicators in BC (sentinel physician ILI rate and MSP influenza visits) were consistent with those of the previous reporting week, remaining below historic levels for this time of year. At the BC Public Health Microbiology & Reference Laboratory, 190 respiratory specimens were tested. Influenza was detected in 34 (18%) specimens: pandemic influenza A/H1N1 in 13 (7%), A/H3N2 in 6 (3%), unsubtyped influenza A in 6 (3%), and influenza B in 9 (5%) specimens. Of 190 specimens tested, other respiratory viruses detected included 14 (7%) RSV, 19 (10%) rhino/enterovirus and 17 (9%) coronavirus.

Full report:
http://www.bccdc.ca/NR/rdonlyres/222...k05_201011.pdf

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Re: British Columbia Influenza Surveillance Bulletin 2010-11 Week 3

BRITISH COLUMBIA INFLUENZA SURVEILLANCE BULLETIN 2010-11: Number 11, Week 4 January 23 to 29, 2011

Low level mix of influenza viruses detected in BC

Summary

During week 4 (January 23 ? 29, 2011), influenza surveillance indicators in BC (sentinel physician ILI rate and MSP influenza visits) were consistent with those of the previous reporting week, remaining below historic levels for this time of year. At the BC Public Health Microbiology & Reference Laboratory, 153 respiratory specimens were tested. Influenza A was detected in 19 (12%) specimens: pandemic influenza A/H1N1 in 7 (4.5%), A/H3N2 in 5 (3%), and unsubtyped influenza A in 7 (4.5%). Influenza B was detected in 9 (6%) specimens. Of 153 specimens tested, other respiratory viruses detected included 17 (11%) RSV, 11 (7%) rhino/enterovirus and 6 (4%) parainfluenza.


Full report:
http://www.bccdc.ca/NR/rdonlyres/87C...k04_201011.pdf

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Re: British Columbia Influenza Surveillance Bulletin 2010-11 Week 3

BRITISH COLUMBIA INFLUENZA SURVEILLANCE BULLETIN 2010-11: Number 10, Week 3 January 16 to 22, 2011



Slight increase in influenza activity in BC

Summary

During week 3 (January 16 ? 22, 2011), influenza surveillance indicators in BC (sentinel physician ILI rate and MSP influenza visits) were mostly consistent with the last reporting period, showing only slight increase while remaining below historic levels for this time of year. At the BC Public Health Microbiology & Reference Laboratory, 173 respiratory specimens were tested. Influenza A was detected in 37 (21%) specimens: pandemic influenza A/H1N1 in 14 (8%), A/H3N2 in 14 (8%), and unsubtyped influenza A in 9 (5%). Influenza B was detected in 4 (2%) specimens.

Full report:
http://www.bccdc.ca/NR/rdonlyres/FB4...k03_201011.pdf

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Re: British Columbia Influenza Surveillance Bulletin 2010-11 Week 2

BRITISH COLUMBIA INFLUENZA SURVEILLANCE BULLETIN 2010-11: Number 9, Week 2 January 9 to 15, 2011


Slight increase in influenza activity in BC

Summary

During week 2 (January 9 ? 15, 2011), influenza surveillance indicators in BC (sentinel physician ILI rate and MSP influenza visits) showed slight increase while remaining below historic levels for this time of year. At the BC Public Health Microbiology & Reference Laboratory, 126 respiratory specimens were tested. Influenza A was detected in 25 (20%) specimens: pandemic influenza A/H1N1 in 19 (15%) and A/H3N2 in 6 (5%). Influenza B was detected in 5 (4%) specimens.

Full report:
http://www.bccdc.ca/NR/rdonlyres/BBE...k02_201011.pdf

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BRITISH COLUMBIA INFLUENZA SURVEILLANCE BULLETIN 2010-11: Number 8, Week 01 January 02 to January 08, 2011

Summary

During week 1 (January 2 ? 8, 2011), influenza surveillance indicators in BC (sentinel physician ILI rate and MSP influenza visits) showed slight increase while remaining below historic levels for this time of year. At the BC Public Health Microbiology & Reference Laboratory, 125 respiratory specimens were tested. Influenza A was detected in 19 (15%) specimens: pandemic influenza A/H1N1 in 15 (12%) and A/H3N2 in 4 (3%). One laboratory-confirmed pandemic A/H1N1 elementary school outbreak was reported in Northern Health.

http://www.bccdc.ca/NR/rdonlyres/D8C...k01_201011.pdf

Previous reports:
http://www.bccdc.ca/dis-cond/Disease...nceReports.htm