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Respiratory tract diseases
Covid-19 mask mandates end in some states, fueling tensions
The rational balloon becomes irrational – and the next few weeks are critical, says the strategist
Covid-19 was spreading in China before the first confirmed cases, new evidence suggests
The single dose of Pfizer vaccine is 85% effective, Israeli studies show
We will have immunity from the herd until April
Behind the launch of America’s wrong vaccination: fragmented communication, wrong supply
These doctors want to choose their Covid-19 vaccine, fearful reactions, lower efficacy
Brazil turns the sleepy city of sugar cane into a global Covid-19 experiment
The UK is approving processes that will deliberately infect coronavirus volunteers
Vaccine delays in pandemic developing nations prolong the risk
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