Measles & Rubella Weekly Monitoring Report: April 26 to May 02, 2015 (week 17)
- In Canada, no new cases of measles were reported during week 17.
- Two provinces (Manitoba and Quebec) have reported recent measles activity. These events are not linked, as they are different genotypes and resulted from separate importation events.
- A total of 193 cases of measles, and 0 cases of rubella have been reported in Canada for 2015.
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Figure 1. Number of cases of measles (n=193) 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 May 02, 2015.
During epidemiological week 17, 2015, no new cases of measles were reported.
Recent measles activity reported prior to week 17 includes an imported case in Manitoba (linked to travel to South Africa), and an outbreak in Quebec (linked to travel to India).
The year-to-date total is 193 cases of measles and 0 cases 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.
To date in 2015, 53 measles cases have been genotyped and the genotypes were: B3 (n=21), D4 (n=17), H1 (n=11) and D8 (n=4).
Two cases from Quebec, related to travel to India, were genotype D8 which is endemic in IndiaFootnote 2.
One case from Manitoba, with travel history to South Africa, was genotype B3 which is endemic in the African region (including South Africa)Footnote 2.
Figure 3: Distribution of measles genotypes detected in 2015 (n=53) by week of rash onset (if available, n=53) 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.
* 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 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.
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