Measles & Rubella Weekly Monitoring Report: May 31 to June 6, 2015 (week 22)
- In Canada, during week 22, no new cases of measles were reported for 2015.
- A total of 195 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=195) 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 June 06, 2015.
During epidemiological week 22, 2015, no new cases of measles were reported.
Recent measles activity reported prior to week 22 includes a case in Ontario with no history of travel, and no known source of exposure.
The year-to-date total is 195 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.
To date in 2015, 55 measles cases have been genotyped and the genotypes were: B3 (n=22), D4 (n=17), H1 (n=11) and D8 (n=5).
One case of measles reported by Ontario with rash onset in week 19 was genotype D8.
Figure 3: Distribution of measles genotypes detected in 2015 (n=55) by week of rash onset (if available, n=55) 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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