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

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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This is coming from the MSM? Really? Next thing you know they'll post an article wondering why the vaccinated are catching the virus more than the uunvaccinated.