protection against serious disease. reporter: pfizer s original vaccine was initially shown to be 95% effective at preventing infection, but over time, the potency wore off boosters were necessary. demand has dropped just over 108 million people have the first booster. only 23 million have gotten the second. even so, pfizer says it has 30 million doses of this new booster ready to go out the door stephanie, let me ask you this late last week moderna announced it s suing pfizer for patent infringement for its covid vaccine. how is the company responding reporter: lester, pfizer says it s surprised by this lawsuit. adding that the technology it based its vaccine on was developed by biontech, that s pfizer s partner company in germany. all right, stephanie, thank you president biden traveled to battleground pennsylvania today, saying in a fiery speech he s determined to ban assault weapons in the u.s he also defended the
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