The detection of additional variants adds to concerns that a brutal COVID-19 wave battering Brazil may keep breaking grim records for weeks to come.
The rapid spread of the P.1 variant in some parts of Canada has added new urgency to the race between variants and vaccines.
The variant first identified in Brazil -- P1 -- is also the variant in a cluster in Whistler, B.C., that prompted health authorities to shut down the ski resort on Monday.
The latest iteration of COVID-19 making waves is one first identified in California. The Western state is now teeming with the variant B.1.427/B.1.429.