Back in May, the CDC decided to only track severe breakthrough COVID cases in order to better monitor overall conditions. But, according to a piece in Politico, the agency is using outdated and unreliable data and it’s impacting the Biden administration’s ability to make major pandemic decisions, including who needs to get booster shots and when. … So the CDC was tracking all breakthrough infections up until May, and then in May they decided to only track the cases that landed individuals in the hospital. Their rhetoric around the time was that these are the most severe cases, we really only care about the most severe cases because we know that these vaccines are very effective against preventing severe disease and hospitalizations, so they wanted to know which cases were breaking through that barrier. However, a lot of state public health departments say by only tracking hospitalizations it doesn’t really give a clear picture of all the other milder breakthrough infections that are occurring, which can keep people, for example, out of work or sick at home or having them transmitted to the kids.