Health‘Herd immunity’ more complex than reaching 70% vaccine rate, says Oregon health expertBy April Ehrlich (OPB)Nov. 22, 2021 1 p.m. Updated: Nov. 22, 2021 5:23 p.m.With COVID cases declining and the vaccine rate reaching 73%, many Oregonians are wondering when they can drop their face masks. Health experts say: not until early next year, if not longer.THANKS TO OUR SPONSOR:Become a Sponsor📨 Daily news in your inboxSign up today for OPB’s “First Look” – your daily guide to the most important news and culture stories from around the Northwest.EmailPlease leave this field blankSign up