This makes no sense

>hub.jhu.edu/2022/08/15/cdc-quarantine-guidelines-for-endemic-covid-david-dowdy/

<CDC no longer requires unvaccinated to quarantine after COVID exposure

nytimes.com/2022/08/21/us/politics/jill-biden-coronavirus-negative.html

<Jill Biden Leaving Isolation After Testing Negative for the Coronavirus

why did she quarantine?