Trudeau cool to the idea of vaccine 'passports' for the post-pandemic world.Ontario moving Sarnia-Lambton region into lockdown starting Monday.WHO approves emergency use for Johnson & Johnson COVID-19 vaccine.Canada adds 259,000 jobs in February, biggest increase since September.Ontario sees 1,371 new cases.Variants of concern cause more than 40% of new cases in Ontario, experts say.N.B. reveals vaccine rollout details, revised timeline for 1st and 2nd doses.Have a question about the coronavirus pandemic? You can reach us at COVID@cbc.caOntario will move the southwestern region of Sarnia-Lambton into lockdown on Monday after a recent spike in COVID-19 cases, making it the fifth region to be under maximum restrictions in the province's coronavirus response framework.The government says it's making the move in consultation with the region's medical officer of health. According to a release from the province, Lambton Public Health's case rate increased by 30.9 per cent, to 110.0 cases per 100,000 people, from March 3 to 9, "well above the provincial average."During the same period of time, COVID-19 hospitalizations in the region have increased by 33.3 per cent, the province says.The province also says it will move the Northwestern Health unit into the second-strictest "red" category of Ontario's colour-coded pandemic framework. The Leeds, Grenville and Lanark District Health Unit will move into the "yellow" category.