Measles & Rubella Weekly Monitoring Report - Week 9, 2017: February 26 to March 4, 2017
- In Canada, 1 new case of measles was reported in week 9, 2017.
- Two provinces, have active measles cases: Nova Scotia (n=4), and Alberta (n=1). These events are not linked, as they resulted from separate importation events (from USA and Indonesia respectively). There are no active cases of rubella.
- A total of 8 cases of measles, and zero cases of rubella have been reported in Canada in 2017.
During epidemiological week 9, 2017, 1 new case of measles was reported in CanadaFootnote 1. This case had rash onset during week 8 (n=1).
To date in 2017, 8 cases of measles have been reported in Canada from two different provinces, Nova Scotia (n=7), and Alberta (n=1). These events are not linked, as they resulted from separate importation events (from USA and Indonesia respectively). Rash onsets occured during week 4 (n=1), week 6 (n=2), week 7 (n=1), and week 8 (n=4). No cases of rubella have been reported in 2017 (Figure 1). It has been 55 epidemiologic weeks since the last rubella case was reported (week 6, 2016).
Figure 1: Number of cases of measles (n=8) 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 March 4, 2017.
There are no reported active cases of rubella in Canada (Figure not shown).
Maps from previous weeks, including any retrospective updates, are available online in the Measles and rubella weekly surveillance maps feature.
Figure 2: Distribution of activeFigure 2 - Footnote *, confirmed measles cases by health region.
To date in 2017, 2 measles cases have been genotyped and the genotypes are B3 (n=2). Genotype information is pending for 2 additional cases (Figure 3).
Two cases with rash onset in weeks 6 and 7 were genotype B3, identical to the MVs/Dublin.IRL/8.16 named strain.
Figure 3: Distribution of measles genotypes detected in 2017 (n=2) by week† of rash onset.
- Figure 3 - Footnote †
Epidemiological weeks for laboratory specimens are assigned in accordance with WHO guidelines (WHO.WER.2012;9 (87):73) with week 1 beginning on the first Monday of the year.
The current global distribution of measles genotypes can be found on the WHO Measles Surveillance 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.
To date in 2017, no rubella cases have been genotyped.
- Footnote 1
Only cases up to the indicated end date are included in this report. Any additional cases will be described in future reports.
- Footnote 2
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).
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