The risk of testing positive for covid is conditioned on the probability of being tested in the first place. The CDC guidance skews towards testing unvaccinated people more aggressively, hence the numbers are predictably skewed towards the unvaccinated. Further confounding the issue, vaccination among kids and teenagers is recent, their VE numbers are going to decline over time.

Medical research indicates VE against infection of about 50% after 6 months, which is 2:1.

https://www.cdc.gov/coronavirus/2019-ncov/symptoms-testing/t...

* People who have symptoms of COVID-19.

* People who have come into close contact with someone with COVID-19 should be tested to check for infection:

* Fully vaccinated people should be tested 5–7 days after their last exposure.

* People who are not fully vaccinated should get tested immediately when they find out they are a close contact. If their test result is negative, they should get tested again 5–7 days after their last exposure or immediately if symptoms develop.

* Unvaccinated people who have taken part in activities that put them at higher risk for COVID-19 because they cannot physically distance as needed to avoid exposure, such as travel, attending large social or mass gatherings, or being in crowded or poorly-ventilated indoor settings.

* People who have been asked or referred to get tested by their healthcare provider, or state, tribal, localexternal icon, or territorial health department.