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In one of the first investigations of the effectiveness of a second mRNA booster against COVID-19 Omicron variants, a study from the U.S. Centers for Disease Control and Prevention (CDC) has found that a second booster shot significantly improved effectiveness against widespread variants Omicron BA.1 and BA.2/BA.2.12.1.

With the first booster, kostprijs rizatriptan vaccine effectiveness against these variants was only 68 percent (lower than against previous variants) and declined to 52 percent effectiveness after six months. With the second vaccine, effectiveness against these variants climbed to 80 percent within the first six months. Data is not yet available for effectiveness after six months.

The study looked at effectiveness of the second booster in reducing COVID Omicron BA.1 and BA.2/BA.2.12.1 related hospitalizations and emergency department (ED) visits and found the shot protected against both hospitalizations and ED visits.

“The findings of this study are important because they provide an answer to a question that many people are asking: Should I get the second booster shot? The data clearly show that a second booster significantly increases vaccine effectiveness against these variants—which while no longer dominant in many areas, are still present,” said study co-author Shaun Grannis, M.D., M.S., vice president for data and analytics at Regenstrief Institute and professor of family medicine at Indiana University School of Medicine. “As we go into the fall, when viruses typically pick up, we want to encourage people who are eligible for a second booster to be proactive and to strongly consider getting one because it will provide greater protection. It will reduce the need for COVID-19-related emergency department visits and hospitalizations.

“From a population health perspective, the protection supplied by the second booster helps ensure that healthcare resources are capable of responding to the full spectrum of medical needs, reducing the chance of overwhelming health systems with COVID-19-related disease.”

Current CDC recommendations for a second booster (fourth shot of the vaccine) are for people 50 and older as well as for moderately or severely immunocompromised individuals who are 12 and older.

“Effectiveness of 2, 3, and 4 COVID-19 mRNA vaccine doses among immunocompetent adults during SARS-CoV-2 Omicron BA.1 and BA.2/BA.2.12.1 sublineage periods—VISION Network, 10 states, December 2021–June 2022” is published in the CDC’s Morbidity and Mortality Weekly Report.

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