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Overall Summary

  • In week 49, laboratory detections of influenza increased sharply for the third consecutive week. The majority of laboratory detections continued to be reported in BC, AB, ON and QC; but with increasing activity in SK and NS.
  • A(H3N2) continues to be the most common type of influenza affecting Canadians. In both laboratory detections and hospitalizations, the majority of cases have been among seniors ≥65 years of age.
  • Similar to the previous week, there were a large number of newly-reported laboratory-confirmed outbreaks of influenza: 37 influenza A outbreaks in 6 provinces, of which 32 were in long-term care facilities (LTCF). Among the outbreaks with known subtype all were due to A(H3N2).
  • The rate of antiviral prescriptions among seniors increased significantly in week 49.

Are you a primary health care practitioner (General Practitioner, Nurse Practitioner or Registered Nurse) interested in becoming a FluWatch sentinel for the 2014-15 influenza season? Contact us at

About FluWatch

FluWatch is Canada's national surveillance system that monitors the spread of flu and flu-like illnesses on an on-going basis. FluWatch reports, posted every Friday, contain specific information for health professionals on flu viruses circulating in Canada.

The FluWatch program consists of a network of labs, hospitals, doctor's offices and provincial and territorial ministries of health. Program objectives include to:

  • Detect flu outbreaks across the country as early as possible
  • Provide timely up-to-date information on flu activity in Canada and abroad to health professionals [and interested Canadians]
  • Monitor circulating strains of the flu virus (like H1N1) and assess their sensitivity to antiviral medications, [such as Tamiflu and Relenza]. Antivirals, when used by doctors to treat flu, can help reduce the severity of the illness and the recovery time for a patient
  • Provide information that the World Health Organization can use to make its recommendations on the best vaccine to use for seasonal flu shots.

The Summary Box above covers the main findings from the current week's FluWatch report.