https://www.siliconvalley.com/2021/12/29/covid-cdc-changes-to-quarantine-isolation-advice-took-local-health-officials-by-surprise/ > (CNN) — State and local health officials say they are struggling to make sense of the new Covid-19 isolation and quarantine guidelines from the US Centers for Disease Control and Prevention. > They say the CDC released the updated advice, which cuts in half the recommended times for staying away from others, with little consultation or preparation.