The CDC published an update to its SARS-CoV-2 vaccination guidance last week. The most notable update addresses quarantine requirements for vaccinated individuals after exposure to known COVID-19 cases. The new guidance largely eliminates quarantine recommendations for fully vaccinated individuals. Individuals who meet all of the following requirements do not need to quarantine after a known exposure:
Received all required doses of the vaccine (i.e., 2 doses for a 2-dose vaccine; 1 dose for a single-dose vaccine)
Received their final doses 2 weeks or longer before the exposure
Are within 3 months of their final dose
Remain asymptomatic following the exposure
The guidance indicates that the timing associated with these requirements will be updated as additional information becomes available. Presumably, this will include extending the 3-month limit as new data are reported from clinical trials regarding the duration of immunity conferred by the vaccines.