Behind the veneer of Russia's World Cup are legions of migrant workers from Central Asia, who built the stadiums and keep them running.
The Oregon Health Authority issued the new temporary rules on Friday.
Going forward, the state will require three days of clean tests before lifting a health advisory.
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Across the U.S., reservoirs that supply drinking water and lakes used for recreation are experiencing toxins in their water due to toxic algae blooms that are growing in frequency.
A health advisory has been issued for Lake Billy Chinook following the discovery of toxic blue-green algae, the Oregon Health Authority said Friday.