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People who test negative might also have coronavirus, warn scientists

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As COVID-19 tests become more widely available across the US, scientists have warned about a growing concern: Many people with negative results might actually have the virus.

That could have devastating implications as a global recession looms and governments wrangle with the question of when to reopen economies shuttered as billions of people were ordered to stay home in an effort to break transmission of the deadly disease.

The majority of tests around the world use a technology called PCR, which detects pieces of the coronavirus in mucus samples.

But "there are a lot of things that impact whether or not the test actually picks up the virus," Priya Sampathkumar, an infectious diseases specialist at Mayo Clinic in Minnesota, told AFP. "It

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Southern Ontario highway partially closed due to convoy demonstrations: police - globalnews.ca - Usa - Canada - city Detroit - county Windsor
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Southern Ontario highway partially closed due to convoy demonstrations: police
convoy demonstrations against COVID-19 measures.Police said the westbound lanes of the highway at Nauvoo Road have been shut down due to “high traffic volumes” from “freedom convoy” demonstrators.Drivers in the area are being asked to follow emergency detour route signage. Windsor-Detroit Ambassador Bridge access resumes after trucker protest blocked traffic “The OPP respects the right of everyone to freedom of expression and peaceful assembly,” police said.“The OPP asks everyone to be patient and respectful of each other despite potential inconvenience.”The closure is approximately 45 km away from the Blue Water Bridge crossing between Canada and the United States in Sarnia, Ont.It’s not clear if that’s where convoy demonstrators are intending to go.Part of Highway 402 was blocked on Sunday as well due to convoy demonstrations. Police have redirected commercial traffic to the Bluewater Bridge in Sarnia, Ont., and urged motorists to avoid the area around the Ambassador Bridge in Windsor, Ont.There, a protest against COVID-19 measures is blocking Canada-bound vehicles from crossing the Ambassador Bridge between Windsor, Ont., and Detroit for a third day.More to come.— With files from The Canadian Press#LambtonOPP have implemented a closure of westbound Highway 402 at Nauvoo Road to ensure public safety.
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