- The CEOs of some pharmaceutical companies say COVID-19 vaccination booster shots may be needed as early as this fall to bolster immunity against the disease.
- Experts say it’s too early to tell if and when those booster shots will be needed.
- Booster shots are not uncommon. They’re used for the Tdap (tetanus, diphtheria, pertussis) vaccine, among others.
The vaccines being used in the United States and other parts of the world are safe and effective in preventing severe cases of COVID-19.
How long that protection lasts is still not fully understood — both the virus and the vaccines against it are relatively new.
As variants of the novel coronavirus continue to spread and mutate, researchers are monitoring how the vaccines perform and whether booster shots will be needed to maintain meaningful immunity.
Right now, experts say it’s too early to speculate whether we’ll need booster shots like some routine vaccines.
Dr. Amesh Adalja, a senior scholar at Johns Hopkins Center for Health Security in Baltimore, says it’s premature to predict whether COVID-19 boosters will be needed and, if so, at what intervals.
“To me, the threshold for boosters would be to see fully vaccinated individuals getting breakthrough infection severe enough to land them in the hospital,” Adalja told Healthline. “We have not crossed that threshold.”
However, the CEO of the companies whose COVID-19 vaccines are being distributed in the United States say their shots may need to be given annually, like a flu shot. They told Axios those boosters could come as early as September.
Data shows Moderna and Pfizer vaccines, which both use the same mRNA technology to create immunity against the novel coronavirus, remain effective after 6 months. Still, Pfizer officials in February said they are testing a booster shot up to a year after a person receives their first two doses.
AstraZeneca’s vaccine — which hasn’t received approval to be used in the United States — has been
An international team of researchers published a
“Additional booster doses might be necessary to extend the duration of protection,” they wrote. “We do not know whether primary series and booster doses can or should be different.”
“It’s just not,” he said. “So I would imagine we will need, at some time, a booster.”
When that booster is needed, Fauci said, remains to be seen. Researchers are continuing to see when the current vaccines’ protections begin to fade.
Source: healthline