The freezer at the Boston pharmacy "was in a secure location and had an alarm system installed," said Toto. "The plug was found loose after a contractor accidentally removed it while cleaning."
Toto said the incident is being investigated.
"Replenishment doses are in process and we do not foresee disruption of our vaccination effort," Toto added.
“Our goal among all of this is to make sure vaccine comes into the state is safe, effective, and viable before it goes into any arms,” said Shah. “This news is concerning, but it’s important to note this is how the system works. There are numerous checks along the way to ensure it is safe and effective, as well as viable.”
The CDC on Friday also said that severe allergic reactions to Moderna Inc’s coronavirus vaccine appear to be quite rare.
Based on the data, the CDC said anaphylaxis, a life-threatening allergic reaction, occurred at a rate of 2.5 cases per 1 million shots administered.
The agency cautioned that the risk of anaphylaxis was difficult to compare to non–COVID-19 vaccines because it is still so early in the vaccination program.
The CDC said the characteristics of severe allergic reactions to Moderna’s vaccine were similar to those reported with the COVID-19 vaccine from Pfizer Inc and partner BioNTech SE.
Earlier this month, the CDC reported severe allergic reactions to the Pfizer/BioNTech shot occurred at a rate of 11.1 per 1 million vaccinations.