CNN)Pfizer's updated results for its experimental treatment for Covid-19 showed it cut the risk of hospitalization or death by 89% if given to high-risk adults within a few days of their first symptoms, the company announced in a news release Tuesday.
The first major real-world study of the omicron Covid-19 variant found that it appeared to cause less severe illness in South Africa, where it was first discovered last month, but that two doses of the Pfizer-BioNTech vaccine offer reduced protection against it.
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