With older adults vaccinated, doctors say a growing share of their covid patients are in their 20s, 30s, 40s and 50s, as more contagious variants circulate among people who remain unvaccinated.
A KHN investigation found that more than 2,000 schools have spent millions of dollars for systems, lured by air purifier companies’ claims that experts say mislead or obscure the potential for harm from toxic ozone.
With some 100 million Americans fully vaccinated, the U.S. is relying on a patchwork network of vaccine monitoring systems that lack the breadth and depth of large, population-based programs, experts said.