Threat to vulnerable Americans rises as Delta variant spreads

Experts worry that immunocompromised people and those who unable to access the vaccine have been forgotten

Just as the troubling Delta variant was spreading through the US, Charis Hill got a worrying call from their doctor.

The medications Hill takes to treat their spondylitis affect their immune system, and they knew the Covid-19 vaccine might not work as well for them as it does for others. So weeks after their second shot, they got a test.