California virus cases rising as delta variant spreads

“It’s a demonstration in the real world, outside of the clinical trials, of the power of the vaccine,” said Andrew Noymer, a public health [associate] professor at University of California, Irvine. “COVID is going to seek out unvaccinated populations. The virus has a way of just sort of bouncing around until it finds a host it can infect, and those will be unvaccinated people.”