Moderna Inc says people who received its COVID-19 vaccine last year are nearly twice as likely to get a breakthrough infection compared to those recently vaccinated.
Breakthrough cases occur when people contract the disease 14 days or more after receiving their final dose of the shot.
New data published on Wednesday found 88 breakthrough cases of COVID-19 among Americans vaccinated from December 2020 to March 2021.
Comparatively, there were 162 cases – 1.8 times as many – among those vaccinated between July 2020 and December 2020.
The Cambridge, Massachusetts-based company also reported 13 severe cases among the early vaccination group compared to six in the later group.
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