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FILE - This undated image provided by Pfizer in November 2021 shows the company's COVID-19 pills. On Tuesday, Dec. 14, 2021, Pfizer said that its experimental COVID-19 pill is effective against the omicron variant and maintained its promising early performance against the virus in final testing. (Pfizer via AP, File)

Pfizer said Tuesday that its experimental pill to treat COVID-19 appears effective against the omicron variant.

The company also said full results of its 2,250-person study confirmed the pill’s promising early results against the virus: The drug reduced combined hospitalizations and deaths by about 89% among high-risk adults when taken shortly after initial COVID-19 symptoms.

Separate laboratory testing shows the drug retains its potency against the omicron variant, the company announced, as many experts had predicted. Pfizer tested the antiviral drug against a man-made version of a key protein that omicron uses to reproduce itself.

The updates come as COVID-19 cases, deaths and hospitalization are all rising again and the U.S. topped 800,000 pandemic deaths. The latest surge, driven by the delta variant, is accelerating due to colder weather and more indoor gatherings, even as health officials brace for the impact of the emerging omicron mutant.

The Food and Drug Administration is expected to soon rule on whether to authorize Pfizer’s pill and a competing pill from Merck, which was submitted to regulators several weeks earlier. If granted, the pills would be the first COVID-19 treatments that Americans could pick up at a pharmacy and take at home.

President Joe Biden called Pfizer’s drug “another potentially powerful tool in our fight against the virus,” in a statement Tuesday.

The U.S. government has agreed to purchase enough of Pfizer’s drug to treat 10 million people. But company executives have indicated that initial supplies will be limited, with only enough to treat tens of thousands of people before the end of the year. By March Pfizer hopes to ramp up production to provide millions of courses of treatment.

Pfizer’s data could help reassure regulators of its drug’s effectiveness after Merck disclosed smaller-than-expected benefits for its drug in final testing. Late last month, Merck said that its pill reduced hospitalizations and deaths by 30% in high-risk adults.

Both companies initially studied their drugs in unvaccinated adults who face the gravest ris

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