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Principles of Disease Surveillance01:26

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Disease surveillance is the systematic collection, analysis, and interpretation of health data essential to the planning, implementation, and evaluation of public health practice. This process integrates data dissemination to entities responsible for preventing and controlling disease, injury, and disability. Surveillance systems provide crucial information for action, helping public health authorities make informed decisions to manage and prevent outbreaks, ensure public safety, optimize...
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Immune surveillance is an integral part of the innate immune system, involving the continuous monitoring of peripheral tissues to detect and respond to pathogens, infected cells, or cancerous cells. This surveillance is conducted primarily by natural killer (NK) cells and phagocytes, which employ distinct but complementary mechanisms to identify and eliminate threats.
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Measles surveillance in Canada: 2015.

L Sherrard1, J Hiebert2, J Cunliffe1

  • 1Centre for Immunization and Respiratory Infectious Diseases, Public Health Agency of Canada, Ottawa, ON.

Canada Communicable Disease Report = Releve Des Maladies Transmissibles Au Canada
|May 18, 2018
PubMed
Summary

Canada maintained measles elimination in 2015, despite challenges from imported cases and low immunization rates. Surveillance data confirmed continued elimination, with 196 cases reported across four provinces.

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Area of Science:

  • Epidemiology
  • Public Health
  • Infectious Disease Surveillance

Background:

  • Canada has maintained measles elimination since 1998.
  • Annual verification of elimination status is presented to the Pan American Health Organization (PAHO).

Purpose of the Study:

  • To present 2015 measles surveillance data for Canada.
  • To provide updated evidence for continued measles elimination status.

Main Methods:

  • Utilized Canadian Measles and Rubella Surveillance System (CMRSS) and MARS pilot project data.
  • Analyzed demographics, risk factors, outbreak characteristics, and conducted genotypic/phylogenetic analyses.
  • Evaluated data against PAHO's essential criteria for measles elimination.

Main Results:

  • Reported 196 measles cases in 2015 (incidence 5.5/1,000,000).
  • Majority of cases (87.2%) were unvaccinated; highest incidence in 10-14 year olds due to a community outbreak.
  • Canada met most PAHO criteria for elimination verification.

Conclusions:

  • 2015 surveillance data strongly supports maintained measles elimination in Canada.
  • Importations and pockets of low immunization coverage remain challenges to elimination status.