There is continued good news about the COVID-19 vaccine.
Pfizer/BioNTech announced their vaccine continues to be effective against COVID for at least 6 months after the second dose.
CNN reports that health experts believe it will remain effective for even longer than 6 months (more than 91% effective against disease with any symptoms), and the 6-month benchmark is being touted as a promising development in the fight against the virus.
"The vaccine was 100% effective against severe disease as defined by the U.S. Centers for Disease Control and Prevention (CDC), and 95.3% effective against severe COVID-19 as defined by the U.S. Food and Drug Administration (FDA)," Pfizer and BioNTech said in a statement.
Additionally, Pfizer/BioNTech announced the vaccine is fully effective against the B.1.351 variant of the virus, which was found in South Africa.
Vaccine expert Dr. Peter Hotez tells CNN the news is something to celebrate as it could be an indicator the vaccine may remain effective for years.
"The information coming from Pfizer-BioNTech is good news with evidence that those enrolled in the clinical trials last year are still protected. So we know that immunity will not be short-lived," he explains. "Hopefully the protection might last years, but we won't know until we know."
Immunologist Dr. Scott Hensley, who has studied mRNA vaccines like the Pfizer and Moderna vaccines, tells CNN the news could be a sign that people would only need both shots of the vaccine once and possibly not annually.
"These mRNA vaccines -- it really seems the level of antibodies they elicit are so high, they are persistent. And the combination of having very high levels of antibodies and persistent levels of protection are the recipe for a very long level of protection against these variants," he says, adding, "I would not be surprised if this is a vaccine that we only get once."