How long do vaccines last?
This is now a critical issue as the Biden administration prepares to ship tens of millions of unused doses of COVID-19 abroad to help curb the pandemic.
Some state officials have said in recent days that some unused doses may expire at the end of the month, and White House press secretary Jen Psaki said Thursday that imminent expiration dates were a factor. Administration it works so that doses are shipped as quickly as possible.
Many drugs and vaccines can last for years if stored properly, but all can end up losing effectiveness in the same way that food can be degraded in a pantry. Vaccine suppliers monitor the expiration dates that are included with each batch, to make sure they are consuming supplies on time.
Vaccine expiration dates are determined from data the manufacturer sends to regulators to demonstrate how long the shots are kept at the proper strength, the former vaccine chief of the Food and Drug Administration said. Norman Baylor.
It’s called a “power test” and can vary by seconds vaccine. Some vaccines, such as tetanus vaccines, usually last two years if stored properly.
Like many perishable items, COVID-19 vaccines remain stable for longer lower temperatures.
U.S.-licensed vaccines, manufactured by Pfizer, Moderna and Johnson & Johnson, can last up to about six months from the time of manufacture, depending on how they are stored.
But COVID-19 vaccines are new and these expiration dates could be extended because companies have continued to test batch samples in the months following the deployment of the shots, Baylor said.
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Citation: EXPLANATORY: Why and when do COVID-19 vaccines expire? (2021, June 4), retrieved June 4, 2021 at https://medicalxpress.com/news/2021-06-covid-vaccines-expire.html
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