Measles & Rubella Weekly Monitoring Report - Week 8, 2017: February 19 to February 25, 2017
- In Canada, 4 new cases of measles were reported in week 8, 2017.
- One province (Nova Scotia) has active measles cases, presumed to be linked to travel. There are no active cases of rubella.
- A total of 7 cases of measles, and zero cases of rubella have been reported in Canada in 2017.
During epidemiological week 8, 2017, 4 new cases of measles were reported in CanadaFootnote 1. These cases had rash onset during week 7 (n=1), and week 8 (n=3). All cases are epidemiologically linked to previous cases reported by Nova Scotia.
To date in 2017, 7 cases of measles have been reported in Canada; with rash onsets during week 4 (n=1), week 6 (n=2), week 7 (n=1), and week 8 (n=3). No cases of rubella have been reported in 2017 (Figure 1). It has been 54 epidemiologic weeks since the last rubella case was reported (week 6, 2016).
Figure 1: Number of cases of measles (n=7) 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 February 25, 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 1 additional case; genotype information for the remaining 4 cases is unavailable (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 (if available, n=2) or specimen collection (n=0). Measles cases without specimens available for genotyping are not reflected (n=2).
- 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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