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Influenza activity remains low in Canada; no new laboratory detections reported this week Antigenic Characterization: * The WHO recommends that the vaccines to be used in the 2007-2008 season (northern hemisphere) contain the following: an A/Solomon Islands/3/2006 (H1N1)-like virus; an A/Wisconsin/67/2005 (H3N2)-like virus; and a B/Malaysia/2506/2004-like (B/Victoria/2/1987 lineage) virus. Antiviral Resistance: International:CDC: Similar to previous weeks, a low level of influenza activity was reported in the United States during week 42. Of the 1,349 specimens tested for influenza virus, 29 (2.2%) were positive. The proportion of deaths attributed to pneumonia and influenza was slightly above the epidemic threshold, however the proportion of outpatient visits for ILI (1.3%) was below national and region-specific baseline levels. From May 20 - September 29, 2007, CDC antigenically characterized 14 influenza isolates: 2 influenza A (H1) (both A/Solomon Islands/3/2006(H1N1)-like); 10 influenza A (H3) (6 A/Wisconsin/67/2005(H3N2)-like, 2 A/Brisbane/10/2007(H3N2)-like and 2 showed reduced titers to A/Wisconsin/67/2005 and A/Brisbane/10/2007); and 2 B/Yamagata lineage viruses. A/Brisbane/10/2007 is a recent antigenic variant related to the A/Wisconsin/67/2005 vaccine virus. EISS: In week 43, low levels of influenza activity in Europe were reported with 28 countries reporting no or only sporadic influenza activity. There have been sporadic laboratory confirmed cases of influenza since week 40: 21 cases of influenza A and 12 cases of influenza B. In the last 4 weeks, the consultation rates for ILI and/or ARI have been at levels usually seen outside the winter period. Based on antigenic and/or genetic characterization of 4 influenza viruses, 3 were A/Solomon Islands/3/2006(H1N1)-like and 1 was B/Florida/4/2006-like (B/Yamagata/16/88 lineage). However, it is too early to say which virus type or subtype will become dominant in Europe this season. Human Avian Influenza: Since 27 October 2007, the WHO reported one new case of human infection with the H5N1 avian influenza virus from Indonesia. The case was a 3-year-old male who developed symptoms on 14 October and has recovered. Recommendation for the Use of Amantadine for Treatment and Prevention of Influenza | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
![]() Total number of influenza tests performed and number of positive tests by province/territory of testing laboratory, Canada, 2007-2008
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, 2007-2008 (N=54)
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, 2007-2008 Percent positive influenza tests, compared to other respiratory viruses, Canada, by reporting week, 2007-2008
![]() Influenza strain characterization, Canada, cumulative, 2007-2008 influenza season by the Respiratory Viruses Section at the National Microbiology Laboratory {Strain characterization, number identified, per cent of total number} NACI recommends that the trivalent vaccine for the 2007-2008 season in Canada contain A/New Caledonia/20/1999 (H1N1)-like, A/Wisconsin/67/2005 (H3N2)-like, and B/Malaysia/2506/2004-like virus antigens. ![]() Influenza-like illness (ILI) consultation rates, Canada, by report week, 2007-2008 compared to 1996/97 through to 2006/07 seasons
Note: No data available for mean rate in previous years for weeks 19 to 39 (1996-1997 through 2002-2003 seasons). ![]() Number of New Outbreaks in Long Term Care Facilities, Canada, by Report Week, 2007-2008 ![]() |
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Please note that the above graphs may change as late returns come in. Definitions for the 2007-2008 season [FluWatch]
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Last Updated: 2007-10-26 | ![]() |