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HOW IS GENOMIC SEQUENCING DONE? Positive samples, typically taken from travel-related cases or those that were otherwise flagged for sequencing, are sent to a specific lab which has the equipment required to get a closer look at the virus s genetic code. From there, a specially-trained scientist looks for mutations and changes from the main SARS-CoV-2 virus, going through the code line by line. The process, which can take anywhere from a couple days to a full week, is tedious, expensive and requires a level of scientific equipment and knowledge only accessible in a handful of labs across the country, says Dr. Tony Mazzulli, a medical microbiologist at Public Health Ontario Laboratory.

South africaChristine elliottSamira mubarekaBonnie henryTony mazzulliJoel riveroVanessa allenCaroline colijnPublic health ontario labPublic health ontario laboratorySunnybrook health sciences centreBc centre for diseasePublic health ontarioSimon fraser universityCanadian pressMount sinai