The CDC stopped tracking most COVID-19 cases in vaccinated people. That makes it hard to know how dangerous Delta really is. | WHAT REALLY HAPPENED

The CDC stopped tracking most COVID-19 cases in vaccinated people. That makes it hard to know how dangerous Delta really is.

It was great news: From January to April, just 0.01% of vaccinated Americans — around 10,000 out of 100 million people — got breakthrough infections, or cases of COVID-19 diagnosed after they were fully immunized.

That's according to a report from the Centers for Disease Control and Prevention, which also indicated that certain coronavirus variants were to blame for most of these breakthrough cases. However, the CDC only had genetic sequencing for around 5% of the post-vaccine infections, and the report didn't include data about the Delta variant. That strain, first detected in the US in March, might pose the greatest challenge to vaccine efficacy.

But before more data could be collected to answer these lingering questions, the CDC stopped tracking breakthrough infections that resulted in asymptomatic, mild, or moderate cases. Since May 1, the agency has only reported and investigated coronavirus infections among vaccinated people that resulted in hospitalization or death.

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