decline. this is due, in part, at least to an increase in vaccinations as you see there on your graph. nearly 200 million adults have had at least one dose. that is those age 18 and up. states are increasingly cracking down with vaccine mandates. first there were deadline days for health care workers in can have. cnn's jason carroll takes a look at how well health systems are meeting that requirement. >> reporter: deadline day in the nation's most populist state, all 2 1/2 million health care workers in california must be fully vaccinated or risk losing their jobs. cedar sinai and u.c. davis both show more than 90% compliance. >> we have patients, older patients, immunocompromised patients. these are safe and effective vaccines. these have to be mandated for health care workers. >> reporter: in other parts of the country, we're seeing the