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 * U.S.


DELTA SURGE OF COVID-19 RECEDES, LEAVING WINTER CHALLENGE AHEAD


INFECTIONS, HOSPITALIZATIONS AND DEATHS DECLINE IN MOST STATES; ‘WE MAY BE AT A
TURNING POINT’

Covid Vaccine Efficacy Numbers, Explained
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Covid Vaccine Efficacy Numbers, Explained

Recent studies have shown that the effectiveness of Covid-19 vaccines is
decreasing, though experts say the shots still work well. WSJ explains what the
numbers mean and why they don’t tell the full story. Photo illustration: Jacob
Reynolds/WSJ
By
Jon Kamp
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JON KAMP

 * Biography
 * @jon_kamp
 * Jon.Kamp@wsj.com

and
Brianna Abbott
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BRIANNA ABBOTT

 * Biography
 * @Brabbott42
 * brianna.abbott@wsj.com

Updated Oct. 31, 2021 6:28 pm ET

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The Delta wave of the Covid-19 pandemic is past its peak, with new cases,
hospitalizations and deaths declining in most states. The approaching holidays
and winter months will test whether the U.S. can sustain that momentum.

New Covid-19 case numbers in the U.S. are close to levels recorded near this
time last year, with a seven-day average at about 72,000 a day, Johns Hopkins
University data show. But the trajectory is opposite. Last fall, cases were
rising while hospitalizations and deaths, trailing indicators, were starting to
follow.

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