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A CDC advisory panel suggests that immunocompromised individuals may benefit from a COVID-19 booster shot, but formal recommendations await FDA approval. The CDC advises these individuals to continue wearing masks and social distancing. The US has purchased 200 million additional doses of Pfizer's vaccine, with delivery expected between October and April. The government also has the option to buy updated vaccines for virus variants. Additionally, the US plans to share 500 million doses globally. Special thanks to Kaiser Health News for their collaboration.

How many additional doses of Pfizer's vaccine is the US government buying?

What option does the government have regarding new or updated versions of the vaccine?