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Canada: Localized influenza activity is reported in three provinces: Alberta, with two outbreaks (hospital and school); Ontario, with one outbreak (retirement lodge); and Nova Scotia, with one outbreak (long-term care facility). Sporadic activity is reported in all regions of British Columbia, parts of Alberta, Ontario and Nova Scotia, while the rest of the country reports no activity. During the week ending November 20 (week 47), sentinel physicians reported 10 cases of influenza-like illness (ILI) per 1000 patient visits, see ILI graph. Over the one week period from November 14 to November 20, the Public Health Agency of Canada (PHAC) (formerly Population and Public Health Branch, Health Canada) received 1275 reports of laboratory tests for influenza, including 27 (2.1%) influenza A detections and no influenza B detections (see table below). The National Microbiology Laboratory has antigenically characterized 26 influenza viruses, including 25 A/Fujian/411/02(H3N2)-like, and 1 B/ Shanghai /361/02. Detections of other respiratory viruses are at or below the expected range for this time of year. To date this season, there have been a total of 13 influenza outbreaks, of which 9 were reported in LTCF/ retirement lodges, 3 were reported in hospitals and 1 was reported in a school. Avian Influenza: No new human cases of avian influenza H5N1 were reported in Thailand or Viet Nam this week. United States: CDC: During the week ending November 20, 2004 (week 46), Alaska and Delaware reported widespread activity, and New York and New York City reported regional activity. Thirty-one states and the District of Columbia reported sporadic activity. ILI accounted for 1.5% of patient visits to sentinel physicians, which is below the national baseline of 2.5%. Sentinel cities reported 6.7% of deaths as attributable to pneumonia and influenza, which is below the epidemic threshold of 7.2% for this week. During week 46, the CDC received 1,118 specimens for influenza testing and 36 (3.2%) were positive. Nine influenza A (H3N2), 18 unsubtyped influenza A viruses, and 9 influenza B viruses were identified. Over October 3 to November13, there have been no laboratory-confirmed influenza-associated hospitalizations for children 0-4 years old. In years 2000-03, the end-of-season hospitalization rate ranged from 3.7 to 12 per 10,000 children. International: EISS- Influenza activity in Europe remains low with only sporadic laboratory confirmed cases of influenza reported in four countries ( Belgium, England, France and Ireland). The number of influenza positive specimens decreased slightly for week 47, while an increase was reported for RSV detections. So far this season, more influenza A viruses were detected than influenza B viruses: 38 influenza A versus ten influenza B. The influenza A subtypes so far detected show both influenza A(H1) and influenza A(H3) viruses.
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Total number of influenza tests performed and number of positive tests by province/territory of testing laboratory, Canada, 2004-2005
Specimens from NT, YT, and NU are sent to reference laboratories in other provinces. Note: Cumulative data includes updates to previous weeks; due to reporting delays, the sum of weekly report totals do not add up to cumulative totals. Abbreviations: Newfoundland/Labrador (NL), Prince Edward Island (PE), New Brunswick (NB), Nova Scotia (NS), Quebec (QC), Ontario (ON), Manitoba (MB), Saskatchewan (SK), Alberta (AB), British Columbia (BC), Yukon (YT), Northwest Territories (NT), Nunavut (NU) Respiratory virus laboratory detections in Canada, by geographic
regions, are available weekly on the following website:
Number of influenza surveillance regions† reporting widespread or localized influenza activity, Canada, by report week, 2004-2005 (N=52)
† sub-regions within the province or territory as defined by the provincial/territorial epidemiologist. Graph may change as late returns come in.
Influenza tests reported and percentage of tests positive, Canada, by report week, 2004-2005
Percent positive influenza tests, compared to other respiratory viruses by reporting week, Canada, 2004-2005
Influenza strain characterization,
Canada, cumulative, 2004-2005 influenza season by the Respiratory Viruses
Section at the National Microbiology Laboratory
NACI recommends that the trivalent vaccine for the 2004-2005
season in Canada contain A/New Caledonia/20/99 (H1N1)-like, A/Fujian/411/2002
(H3N2)-like, and B/Shanghai/361/2002-like virus antigens.
Influenza-like illness (ILI) reporting rates, Canada, by report week, 2004-2005 compared to 1996/97 through 2003/2004 seasons
Note: No data available for mean rate in previous years for weeks 21 to 39 (1996-1997 through 2002-2003 seasons). During weeks 20-39, 2002-2003/ 2004-2005 seasons, ILI is reported once every two weeks, on even weeks only
Number of Outbreaks in Long Term Care Facilities by Report Week, Canada, 2004-2005
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Please note that the above graphs may change as late returns come in. Definitions for the 2004-2005 season [FluWatch]
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Last Updated: 2004-11-26 |  |
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