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Re: Canada FluWatch Weekly Reports 2010-2011 Season - Weeks 51 & 52
Overall Influenza Summary ? Week 1 (January 2 to 8, 2011)
In week 01, two regions (in ON and QC) reported widespread influenza activity, 13 regions reported localized activity (in BC, AB, MB, ON & QC), 24 regions reported sporadic activity (in all provinces and territories except YK and NL) and 16 regions presented no activity (See Activity level Map). Compared to the previous 2 weeks (weeks 51 & 52), 19 regions reported increased influenza activity, 2 regions reported decreased activity, and 15 regions maintained a stable level of influenza activity (sporadic or higher). During week 01, 37 new ILI/influenza outbreaks were reported: 25 in long-term care facilities (LTCF) in MB(3), ON(12), and QC(10); 3 outbreaks in hospitals in AB(1) and ON(2); 8 outbreaks in other facilities/settings in AB(1), ON(6) and PE(1), and a school outbreak in BC.
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ILI consultation rate
During week 01, the national ILI consultation rate was 47.2 consultations per 1,000 patient visits, which is down slightly compared to 51.4 per 1,000 in week 52. This rate is still within the expected levels for this time of year (see ILI graph). Children under 5 years of age had the highest consultation rates (100.7 per 1,000 consultations in week 01) followed by children between 5 and 19 years (90.9 per 1,000).
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Laboratory Surveillance Summary
The proportion of tests that were positive for influenza during week 01 was 25.5%. The proportion of positive tests has increased since week 45, and now appears to be approaching the peak. Of the 1879 positive tests reported during week 01, 473 specimens were reported as influenza A/H3N2, 44 as pandemic H1N1 2009 (AB, MB, ON, QC, NB, PE), 36 as influenza B (AB, ON & QC) and 1326 as unsubtyped influenza A. Although the majority of influenza virus detections to date this season were influenza A viruses (97.9% or 5540/5661), detections for influenza B viruses continued to increase. Since the beginning of the season, 93.2% of the subtyped positive influenza A specimens were influenza A/H3N2.During week 01, 67.4% (149/221) of cases with A/H3N2 reported through the detailed case-based laboratory reporting were aged 65 years or older, while since August 29, 2010, the proportion was 51.9% (700/1348) (see Tests detailed table). In week 01, the proportion of respiratory syncytial virus detections (RSV) decreased slightly to 9.5% of specimens tested while low levels of parainfluenza (2.7%) and adenovirus (1.7%) continue to be reported (see Respiratory viruses graph).
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Paediatric Influenza Hospitalizations and Deaths
In week 01, 23 new laboratory-confirmed influenza-associated paediatric (16 years of age and under) hospitalizations were reported through the Immunization Monitoring Program Active (IMPACT) network: 1 from BC, 1 from AB, 13 from ON, and 8 from QC. This number decreased compared to weeks 51 & 52 in which 29 and 68 paediatric hospitalizations were reported, respectively (note that these numbers may fluctuate because of the delays in reporting). Since the beginning of the season, 193 hospitalizations with laboratory-confirmed influenza have been reported from BC, AB, SK, MB, ON & QC; 36 (18.6%) as influenza A/H3N2, 6 (3.1%) pandemic H1N1 2009, 144 (74.6%) as unsubytped influenza A, and 7 (3.6%) type B. The distribution of cases to date by age group was as follows: 15.5% among 0-5 month olds; 27.5% among 6-23 month olds; 32.1% among the 2-4 year-olds; 17.1% among 5-9 year-olds; and 7.8% among children 10-16 years old. This season, one death in a child aged between 6 months and 23 months, who tested positive for pandemic H1N1 2009 has been reported.
Adult Influenza Hospitalizations and Deaths
During week 01, 100 new laboratory-confirmed influenza-associated adult (16 years of age and older) hospitalizations were reported through the Canadian Nosocomial Infection Surveillance Program (CNISP) from 29 sites. This number is decreased compared to the previous week (week 52) when 115 adult hospitalizations were reported (note that these numbers may fluctuate because of the delays in reporting). New hospitalizations were reported from CNISP sites in AB, MB, ON & QC. Of these 100 hospitalized cases 89 (89%) tested positive for unsubtyped influenza A, 2 as influenza A/H3N2, 4 as pandemic H1N1 2009, and 5 as influenza B. Since the beginning of the season, 411 hospitalized cases have been reported: 95 A/H3N2, 14 pandemic A/H1N1, 294 influenza A unsubtyped, and 8 influenza B, from BC, AB, MB, ON and QC. 299 of the 411 (72.7%) cases were aged 65 years or older and 180 (43.8%) were males.
Among the ten provinces and territories conducting severe outcomes surveillance, since the beginning of the season 25 deaths have been reported among laboratory-confirmed influenza cases, 3 in MB and 22 in ON. Among these 25 fatal cases, influenza A/H3N2 was identified in 52% (13/25), and unsubtyped influenza A in 40% (10/25). Pandemic H1N1 2009 was identified in 2 cases (8%). Seventy-two percent (18/25) of these fatal cases were among persons 65 years of age or older, and another 20% (5/25) were between the ages of 45 and 64 years old, in keeping with the age-groups usually affected by A/H3N2.
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full report at; http://www.phac-aspc.gc.ca/fluwatch/...011-01-eng.pdf
Overall Influenza Summary ? Week 1 (January 2 to 8, 2011)
In week 01, two regions (in ON and QC) reported widespread influenza activity, 13 regions reported localized activity (in BC, AB, MB, ON & QC), 24 regions reported sporadic activity (in all provinces and territories except YK and NL) and 16 regions presented no activity (See Activity level Map). Compared to the previous 2 weeks (weeks 51 & 52), 19 regions reported increased influenza activity, 2 regions reported decreased activity, and 15 regions maintained a stable level of influenza activity (sporadic or higher). During week 01, 37 new ILI/influenza outbreaks were reported: 25 in long-term care facilities (LTCF) in MB(3), ON(12), and QC(10); 3 outbreaks in hospitals in AB(1) and ON(2); 8 outbreaks in other facilities/settings in AB(1), ON(6) and PE(1), and a school outbreak in BC.
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ILI consultation rate
During week 01, the national ILI consultation rate was 47.2 consultations per 1,000 patient visits, which is down slightly compared to 51.4 per 1,000 in week 52. This rate is still within the expected levels for this time of year (see ILI graph). Children under 5 years of age had the highest consultation rates (100.7 per 1,000 consultations in week 01) followed by children between 5 and 19 years (90.9 per 1,000).
...
Laboratory Surveillance Summary
The proportion of tests that were positive for influenza during week 01 was 25.5%. The proportion of positive tests has increased since week 45, and now appears to be approaching the peak. Of the 1879 positive tests reported during week 01, 473 specimens were reported as influenza A/H3N2, 44 as pandemic H1N1 2009 (AB, MB, ON, QC, NB, PE), 36 as influenza B (AB, ON & QC) and 1326 as unsubtyped influenza A. Although the majority of influenza virus detections to date this season were influenza A viruses (97.9% or 5540/5661), detections for influenza B viruses continued to increase. Since the beginning of the season, 93.2% of the subtyped positive influenza A specimens were influenza A/H3N2.During week 01, 67.4% (149/221) of cases with A/H3N2 reported through the detailed case-based laboratory reporting were aged 65 years or older, while since August 29, 2010, the proportion was 51.9% (700/1348) (see Tests detailed table). In week 01, the proportion of respiratory syncytial virus detections (RSV) decreased slightly to 9.5% of specimens tested while low levels of parainfluenza (2.7%) and adenovirus (1.7%) continue to be reported (see Respiratory viruses graph).
...
Paediatric Influenza Hospitalizations and Deaths
In week 01, 23 new laboratory-confirmed influenza-associated paediatric (16 years of age and under) hospitalizations were reported through the Immunization Monitoring Program Active (IMPACT) network: 1 from BC, 1 from AB, 13 from ON, and 8 from QC. This number decreased compared to weeks 51 & 52 in which 29 and 68 paediatric hospitalizations were reported, respectively (note that these numbers may fluctuate because of the delays in reporting). Since the beginning of the season, 193 hospitalizations with laboratory-confirmed influenza have been reported from BC, AB, SK, MB, ON & QC; 36 (18.6%) as influenza A/H3N2, 6 (3.1%) pandemic H1N1 2009, 144 (74.6%) as unsubytped influenza A, and 7 (3.6%) type B. The distribution of cases to date by age group was as follows: 15.5% among 0-5 month olds; 27.5% among 6-23 month olds; 32.1% among the 2-4 year-olds; 17.1% among 5-9 year-olds; and 7.8% among children 10-16 years old. This season, one death in a child aged between 6 months and 23 months, who tested positive for pandemic H1N1 2009 has been reported.
Adult Influenza Hospitalizations and Deaths
During week 01, 100 new laboratory-confirmed influenza-associated adult (16 years of age and older) hospitalizations were reported through the Canadian Nosocomial Infection Surveillance Program (CNISP) from 29 sites. This number is decreased compared to the previous week (week 52) when 115 adult hospitalizations were reported (note that these numbers may fluctuate because of the delays in reporting). New hospitalizations were reported from CNISP sites in AB, MB, ON & QC. Of these 100 hospitalized cases 89 (89%) tested positive for unsubtyped influenza A, 2 as influenza A/H3N2, 4 as pandemic H1N1 2009, and 5 as influenza B. Since the beginning of the season, 411 hospitalized cases have been reported: 95 A/H3N2, 14 pandemic A/H1N1, 294 influenza A unsubtyped, and 8 influenza B, from BC, AB, MB, ON and QC. 299 of the 411 (72.7%) cases were aged 65 years or older and 180 (43.8%) were males.
Among the ten provinces and territories conducting severe outcomes surveillance, since the beginning of the season 25 deaths have been reported among laboratory-confirmed influenza cases, 3 in MB and 22 in ON. Among these 25 fatal cases, influenza A/H3N2 was identified in 52% (13/25), and unsubtyped influenza A in 40% (10/25). Pandemic H1N1 2009 was identified in 2 cases (8%). Seventy-two percent (18/25) of these fatal cases were among persons 65 years of age or older, and another 20% (5/25) were between the ages of 45 and 64 years old, in keeping with the age-groups usually affected by A/H3N2.
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full report at; http://www.phac-aspc.gc.ca/fluwatch/...011-01-eng.pdf
</TD></TR><TR class=alignCenter><TD class=alignCenter>No Activity</TD><TD class=alignCenter>
</TD></TR><TR class=alignCenter><TD class=alignCenter>Sporadic Activity</TD><TD class=alignCenter>
</TD></TR><TR><TD class=alignCenter>Localized Activity</TD><TD class=alignCenter>
</TD></TR><TR><TD class=alignCenter>Widespread Activity</TD><TD class=alignCenter>
</TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></TD></TR><TR><TD class=fontSize85 colSpan=2>Note: Influenza activity levels, as represented on this map, are assigned and reported by Provincial and Territorial Ministries of Health, based on laboratory confirmations, sentinel ILI rates (see graphs and tables) and reported outbreaks. Please refer to detailed definitions on the last page. For areas where no data is reported, late reports from these provinces and territories will appear on the FluWatch website.
</TD></TR><TR class=alignCenter><TD class=alignCenter>No Activity</TD><TD class=alignCenter>
</TD></TR><TR class=alignCenter><TD class=alignCenter>Sporadic Activity</TD><TD class=alignCenter>
</TD></TR><TR><TD class=alignCenter>Localized Activity</TD><TD class=alignCenter>
</TD></TR><TR><TD class=alignCenter>Widespread Activity</TD><TD class=alignCenter>
</TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></TD></TR><TR><TD class=fontSize85 colSpan=2>Note: Influenza activity levels, as represented on this map, are assigned and reported by Provincial and Territorial Ministries of Health, based on laboratory confirmations, sentinel ILI rates (see graphs and tables) and reported outbreaks. Please refer to detailed definitions on the last page. For areas where no data is reported, late reports from these provinces and territories will appear on the FluWatch website.
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