Ontario commuters are being warned after a passenger with COVID-19 reportedly travelled on a GO train last week. \nAccording to York Public Health, the traveller rode the Barrie Line GO Train four times between Tuesday, February 9, 2021, and Wednesday, February 10, 2021. \nEditor's Choice: Canada Just Dropped The Official List Of Quarantine Hotels That Travellers Have To Stay At\n\n\n\n“\n\n\nThis COVID-19 infection was later identified through provincial laboratory screening as a variant of concern. The lineage is not yet determined.\n\n\nYork Region Public Health \n\n\nThe individual, who was asymptomatic at the time of their travel, didn't develop symptoms until February 11. \nThey have since placed themselves in self-isolation.\nYork Public Health has stated that the case has been identified as a variant of concern. \nOther riders who boarded the train around 7:30 a.m. and 5 p.m. on those dates are now being asked to get tested, even if they are asymptomatic. \nMetrolinx stated in a blog post that the train the passenger rode would have since been disinfected twice daily. \nAt the moment, there have been no outbreaks related to their trains, buses or stations, they say.