Seattle announced Tuesday that 70 percent of its residents 12 and older are fully vaccinated. San Francisco is right behind. KQED’s Lesley McClurg reminds us what herd immunity really means.

<p>Seattle announced Tuesday that 70 percent of its residents 12 and older are fully vaccinated. San Francisco is right behind. KQED&rsquo;s Lesley McClurg reminds us what herd immunity really means.</p>

KQED serves the people of Northern California with a community-supported alternative to commercial media. We provide citizens with the knowledge they need to make informed decisions; convene community dialogue; bring the arts to everyone; and engage audiences to share their stories.

<p>KQED serves the people of Northern California with a community-supported alternative to commercial media. We provide citizens with the knowledge they need to make informed decisions; convene community dialogue; bring the arts to everyone; and engage audiences to share their stories.</p>