Pfizer vaccine is less effective against infection for kids 5-11, study says : NPR


Pfizer vaccine is less effective against infection for kids 5-11, study says : NPR

A medical staff member prepares a Pfizer-BioNTech COVID-19 vaccine at a pop-up site for school-aged people in New York City last October.

Michael M. Santiago/Getty Images


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Michael M. Santiago/Getty Images


A medical staff member prepares a Pfizer-BioNTech COVID-19 vaccine at a pop-up site for school-aged people in New York City last October.

Michael M. Santiago/Getty Images

The low-dose version of the Pfizer-BioNtech appears to be much less effective at protecting young children against infection than the higher-dose version of the vaccine given to older children and adults, a new study shows.

In all cases, the vaccine proved to provide strong protection against getting seriously ill. The preprint study looked at data collected from more than 1.2 million fully vaccinated children and adolescents between the ages of 5 and 17 from Dec. 13 to Jan. 30.

Researchers from the New York State Department of Health found the ability of the vaccine to protect children from catching the virus who got the lowest dose – kids ages 5 to 11 – dropped the most, falling from 68% to just 12%. Those children received and injection containing just 10 mg, one-third of the dose given to older children and adolescents and adults.

Meanwhile, the effectiveness in children ages 12 to 17, who got the same 30 mg dose as adults, showed a smaller decline, dropping from 66% to 51%.

“These results highlight the potential need to study alternative vaccine dosing for children and the continued importance layered protections, including mask wearing, to prevent infection and transmission,” the study stated.

The results of the study come just days after the CDC eased masking guidelines in many parts of the country, and the same day several school districts, including New York City – the largest in the nation – announced student mask mandates would soon be lifted.

It also follows an unexpected delay in the approval process for an emergency use authorization for the Pfizer-BioNTech COVID-19 vaccine in children 6 months through 4 years of age. The company said new data emerged, and the Food and Drug Administration said it needed more time to evaluate it.


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