COVID cases among vaccinated on the rise in Clark County Cases of COVID-19 in fully vaccinated people are on the rise, accounting for 15 percent of July’s confirmed cases in Clark County, a Southern Nevada Health District official said Thursday. This is compared with 2 percent in March and 3 percent in April, ballooning to 12 percent in June, Cassius Lockett, the district’s director of disease surveillance and control, said in an afternoon interview. So far in August, the percentage is 16 percent. The increase in these breakthrough cases coincides with the delta variant, a far more infectious strain of...