WHO says delta variant accounts for 99% of Covid cases around the world

The delta variant, first detected in India a little less than a year ago, now represents 99% of sequenced Covid-19 cases globally, making it more prevalent than any other strain, officials from the World Health Organization said Tuesday.

Almost all of the up to 900,000 Covid cases sequenced worldwide over the last 60 days originated from the delta strain, Maria Van Kerkhove, the WHO's technical lead on Covid, said during a Q&A streamed on the organization's social media channels. Van Kerkhove's comments come amid an international increase in Covid infections driven by surging cases in Europe. The continent accounted for roughly 60% of the more than 3.3 million new Covid cases in the world last week, Van Kerkhove said.

"Delta is really the dominant one," Van Kerkhove said. "And there are two variants of interest – mu and lambda – that we've been tracking as well, but again, where delta is present, delta takes over."   

Van Kerkhove said Europe represented more than half of the just under 50,000 global Covid deaths in the last week, a 5% increase in fatalities across the continent. Covid cases worldwide have been increasing over the last four consecutive weeks, she added.

"The pandemic is heading in the wrong direction at the moment," Van Kerkhove said.

The decreased use of masks and social distancing are to blame for Europe's surge, Van Kerkhove said at a briefing last week. She cautioned Tuesday that societies reopening across the Northern Hemisphere this winter could lead to a rise in respiratory illnesses over the months ahead, including influenza and other pathogens.

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