Should You Get a Second COVID-19 Booster Shot?
The Centers for Disease Control and Prevention (CDC) recently revised its recommendations, urging high-risk individuals to strengthen their protection against COVID-19 with a second booster shot of the 2024-25 vaccine.
Who Needs the Booster?
For those aged 65 and above, and those with compromised immune systems, the CDC advises a second dose of the updated vaccine six months after the initial dose. This isn’t the first time the CDC has recommended an additional dose for vulnerable groups. Similar guidelines were implemented in the spring of 2022, 2023, and 2024.
Why So Many Boosters?
While no other vaccines require such frequent boosters, experts maintain that the mRNA vaccines from Pfizer and Moderna remain highly effective. Akiko Iwasaki, a professor of immunology at the Yale School of Medicine, emphasizes that there’s no indication the vaccines aren’t working as intended.
“Rather, there may be something unique to this virus that is preventing people’s bodies from maintaining high levels of immunity,” she explains.
A recent study from Emory University researchers suggests that “hybrid immunity” – having both been vaccinated and infected with the coronavirus – doesn’t ensure long-lasting antibody-producing cells. This, unlike with vaccines against the flu and tetanus, raises questions about the specific response to COVID-19.
Dr. Ashish Jha, dean of Brown University School of Public Health and former White House COVID-19 coordinator, acknowledges that the durability of mRNA vaccine immunity might be slightly less compared to older vaccine technologies. He emphasizes that the rapidity of the virus’s mutation and its year-round presence present more significant challenges.
Jha reiterates the importance of supporting the updated CDC guidance and stresses that it’s a measure to combat waning immunity and protect the most vulnerable.
A Changing Virus and Vaccine Strategies
One reason why routine boosters aren’t common for diseases like measles is the virus’s relatively slow mutation rate. “A measles virus today is very similar to one encountered years ago,” explains Jha.
However, the rapid evolution of the COVID-19 virus presents a unique obstacle. “The thought is, can we boost immunity that may not be a perfect match to the circulating strain?” says Dr. Anna Durbin, an infectious disease physician at Johns Hopkins University School of Medicine.
This approach, she says, aims to bolster protection even as the virus constantly evolves.
While Abbotts expects the twice-yearly booster to be mainly focused on high-risk individuals, the broader implications of booster frequency for all populations remain to be seen.
Protect Yourself Today!
Stay up-to-date on the latest COVID-19 vaccine recommendations by visiting the Centers for Disease Control and Prevention website and consult your healthcare provider to determine the best course of action for your individual needs.