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Measles & Rubella Weekly Monitoring Report

Week 44, 2015: November 1 to November 7, 2015

Key Points:

  • In Canada, during week 44, no new cases of measles were reported for 2015.
  • A total of 196 cases of measles, and 0 cases of rubella have been reported in Canada in 2015.

Epidemiological Summary:

Figure 1: Number of cases of measles (n=196) and rubella (n=0), by week of rash onset, as reported to the Canadian Measles/ Rubella Surveillance System (CMRSS) and Measles and Rubella Surveillance system (MARS), for the period ending November 7, 2015.

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During epidemiological week 44, 2015, no new cases of measles were reported.

Recent measles activity reported prior to week 44 includes an imported case in Quebec, linked to travel to Tunisia.

The year-to-date total is 196 cases of measles and 0 case of rubella for 2015.

Note that when additional cases are reported in advance of the cycle, these cases will be described in the appropriate reporting cycle.

Geographic Distribution

Figure 2: Distribution of confirmed measles cases by health region. Cases are included if they are considered activeFootnote *.

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Footnote *
Active cases or outbreaks are those in which the onset date of the most recent case/outbreak-associated case falls within 32 days of the issue date of this reportFootnote 1.

Laboratory Summary

Measles

To date in 2015, 56 measles cases have been genotyped and the genotypes were: B3 (n=23), D4 (n=17), H1 (n=11) and D8 (n=5).

Figure 3 Distribution of measles genotypes detected in 2015 (n=56) by week of rash onset (if available, n=56) or specimen collection (n=0). Epidemiological weeks are assigned in accordance with WHO guidelines (WHO.WER.2012;9(87):73) with week 1 beginning on the first Monday of the year.

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Footnote *
Genotype B3 sequences identical to sequence variant MVi/Harare.ZWE/38.09 (GenBank accession number JF973033)

The current global distribution of measles genotypes can be found on the WHO Measles SurveillanceExternal Link website.

For information regarding the interpretation and use of measles genotyping (including a discussion of genotypes and sequence variants), refer to Hiebert J and Severini A. Canada Communicable Disease Report. 2014; 40-12: 257- 260.

Footnote 1
Public Health Agency of Canada. Guidelines for the prevention and control of measles outbreaks in Canada. Canadian Communicable Disease Report. 2013. Vol. 39: Definitions: conclusion of an outbreak (p. 5).