Today, the US Centers for Disease Control and Prevention (CDC) quietly ended its policy of differentiating within COVID-19 prevention guidance between those who have received Covid vaccines and those who have not.

CDC’s COVID-19 prevention recommendations no longer differentiate based on a person’s vaccination status because breakthrough infections occur, though they are generally mild, and persons who have had COVID-19 but are not vaccinated have some degree of protection against severe illness from their previous infection.