Measles & Rubella Weekly Monitoring Report - Week 12, 2017: March 19 to March 25, 2017
- In Canada, 6 new cases of measles were reported in week 12, 2017.
- Two provinces have active measles cases: Nova Scotia (n=5), and Ontario (n=2). These cases are linked, resulting from one importation event from India. There are no active cases of rubella.
- A total of 16 cases of measles, and zero cases of rubella have been reported in Canada in 2017.
During epidemiological week 12, 2017,6 new cases of measles were reported in CanadaFootnote 1. Five of them , 4 from Nova Scotia and 1 from Ontario, are epi-linked with an index case, imported from India, which was reported and had rash onset during week 11. The sixth case also had a travel history in India but there is no known link between this case and the others.
To date in 2017, 16 cases of measles have been reported in Canada, resulting from 5 unique importation events. In Nova Scotia, one importation led to 6 secondary cases in February, and a second importation to 5 secondary cases in March.
No cases of rubella have been reported in 2017 (Figure 1). It has been 58 epidemiologic weeks since the last rubella case was reported (week 6, 2016).
Figure 1: Number of cases of measles (n=16) 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 25, 2017.
Figure 1 - Text Description
|Epidemiological Week of Rash Onset, 2017||Number of confirmed measles cases reported||Number of confirmed rubella cases reported|
|Missing Rash Onset||0||0|
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 - Text Description
|Health Region||Measles Cases||Rubella Cases|
|Eastern Regional Integrated Health Authority||0||0|
|Central Regional Integrated Health Authority||0||0|
|Western Regional Integrated Health Authority||0||0|
|Labrador-Grenfell Regional Integrated Health Authority||0||0|
|Prince Edward Island||0||0|
|South Shore District Health Authority||5||0|
|South West Nova District Health Authority||0||0|
|Annapolis Valley District Health Authority||0||0|
|Colchester East Hants Health Authority||0||0|
|Cumberland Health Authority||0||0|
|Pictou County Health Authority||0||0|
|Guysborough Antigonish Strait Health Authority||0||0|
|Cape Breton District Health Authority||0||0|
|Capital District Health Authority||0||0|
|Zone 1 (NB)||0||0|
|Zone 2 (NB)||0||0|
|Zone 3 (NB)||0||0|
|Zone 4 (NB)||0||0|
|Zone 5 (NB)||0||0|
|Zone 6 (NB)||0||0|
|Zone 7 (NB)||0||0|
|Québec et Chaudières-Appalaches||0||0|
|Montréal et Laval||0||0|
|Ontario Central East||0||0|
|Ontario Central West||0||0|
|Ontario North East||0||0|
|Ontario North West||0||0|
|Ontario South West||0||0|
|City of Toronto Health Unit||2||0|
|Winnipeg Regional Health Authority||0||0|
|Prairie Mountain Health||0||0|
|Interlake-Eastern Regional Health Authority||0||0|
|Northern Regional Health Authority||0||0|
To date in 2017, 7 measles cases have been genotyped and the genotypes are B3 (n=5) and D8 (n=2). Genotype information is pending for 1 additional case. (Figure 3).
Four cases with rash onset in week 8 were genotyped. Two were genotype B3, identical to the MVs/Dublin.IRL/8.16 named strain (GenBank accession number KY013331). Two cases, imported from France and Indonesia, respectively, were genotyped D8 with distinct viral sequences.
Figure 3 - Text Description
|Epi week||B3||B3 - Harare||D4||D8||D8 - Taunton||D9||H1||Total|
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 with rash onset 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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