Jun 10, 20221 min

Why are boosted Americans testing positive for COVID more than those without extra shot?Read more

- McCLATCHY - JULIA MARNIN - JUN 7, 2022 -

Americans who have received a booster COVID-19 vaccine are testing positive for the virus at a higher rate than those who have received just a primary vaccine series, CDC data shows. But experts say a number of factors likely influence those findings. JOHN LOCHER AP Read more at: https://www.mcclatchydc.com/news/coronavirus/article262241897.html#storylink=cpy

Since late February, Americans who have gotten a booster shot appear to be testing positive for COVID-19 more often than those vaccinated without the extra shot, according to Centers for Disease Control and Prevention data.

This is based on numbers up until the week of April 23, which is the most recently released CDC data comparing case rates of those boosted, vaccinated and unvaccinated against the coronavirus. Ultimately, the numbers, which are updated monthly, showed those unvaccinated had the highest case rates overall.

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Meanwhile, about 119 out of 100,000 boosted individuals tested positive for COVID-19 during the week of April 23, according to CDC data. In comparison, 56 out of 100,000 individuals vaccinated with only a primary series tested positive.

But why are the case rates higher for boosted individuals than for those vaccinated without a booster?

Dr. Sheela Shenoi, an infectious disease doctor and assistant professor at Yale School of Medicine, told McClatchy News over the phone that “there’s no biological reason that people who have had (the vaccine) and boosters are going to be at increased risk for COVID.”

“These numbers are not telling us the whole truth,” Shenoi said.

The CDC wrote in a summary accompanying its data that “several factors likely affect crude case rates” and this makes “interpretation of recent trends difficult.”

Here are some potential factors to keep in mind, according to health experts, when looking at the data.