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Five Things You Need to Know to Start Your Day

Pfizer shot provides less protection against omicron than other variants. Biden warns Putin over Ukraine. Younger generations are rethinking the pursuit of wealth. Here’s what you need to know today. 

Pfizer’s vaccine shot provides less immunity to omicron than to other major variants of Covid-19, according to laboratory experiments in South Africa — where the daily number of hospital admissions more than doubled. But researchers said a booster may still help stop the highly mutated strain. Elsewhere, Glaxo said its antibody treatment Sotrovimab is effective at preventing severe illness against the full combination of mutations in omicron, while a vaccine developed by the company and Canada’s Medicago demonstrated 71% efficacy against multiple variants, but still needs to be tested on the newest one; a European health agency said deaths and hospitalizations were likely to rise due to insufficient vaccination rates; U.S. air travel is nearing pre-Covid levels; and researchers in Hong Kong said they have developed a stainless steel that kills the Covid-19 virus within hours.