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Sanofi plans to ramp up production of its version, but doctors should switch to the Tdap shot in the meantime.
Cases are rising in the United States and globally due to pockets of unvaccinated people.
A reduced risk was seen for venous thromboembolism, arterial thrombosis/thromboembolism and heart failure.
Vaccine effectiveness was 49% at 60 to 119 days after vaccination among tests exhibiting spike gene target failure.
The new booster targets the XBB.1.5 omicron subvariant, which is similar to the dominant variant now circulating.
The new shot targets a highly contagious variant that is in wide circulation nationwide.
Reduced heart rate variability was observed in patients with postvaccination postural orthostatic tachycardia syndrome.
Just under three-quarters of patients with chronic kidney disease receive flu vaccines
The changes include a recommendation for all adults to receive a dose of the new COVID-19 vaccine and RSV vaccination.
More than 2 million people already had received the updated vaccines by Wednesday, according to HHS.