A total of 2,100 doses of the US-made vaccine that were kept too cold in transit have been delivered to the regions of Gävleborg, Halland, Värmland, Dalarna, and Östergötland, a government spokesperson said.
The Swedish Public Health Agency has said there is no risk to those given the Moderna vaccine, but it has halted the rollout and is investigating whether keeping doses too cold may affect the vaccine’s efficacy.
“We apologize for what happened and consider it an accident,” said the deputy health chief of the Gävleborg region, Tina Mansson Söderlund, who also pledged to investigate the incident.
“The worst that can happen is that the vaccine is ineffective, and then we will offer new vaccinations,” she added.
The government’s top epidemiologist, Anders Tegnell, told newspaper Dagens Nyheter that an initial assessment of the situation was that those who received the affected doses are in no danger.
“Unfortunately, the supplier has made a mistake and delivered the vaccine far too cold, ie at the same level as it would have done with Pfizer’s vaccine,” he explained. “The modern vaccine is not made to be moved so cold.”
In some regions, all the delivered Moderna vaccine doses were administered, while some regions have not yet used up all their doses and are now storing their shots, pending the investigation.
The Moderna vaccine can be stored at a temperature of -20C for six months, but it is thought to be stable for 30 days between 2 to 8 degrees, while the Pfizer/BioNTech vaccine must be stored at the colder temperature of -70C.
As of January 17, around 146,000 people had been vaccinated in Sweden, most of whom were given the Pfizer vaccine.
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