As California requires healthcare workers to be fully vaccinated against COVID-19 by Sept. 30, Orange County health officers are advising the public about the mandate while encouraging more residents to receive vaccinations. “As with many viruses, COVID-19 is frequently changing,” Dr. Regina Chinsio-Kwong said in an Aug. 6 statement. “These changes result in new versions of the virus called ‘variants.’ We’re particularly worried about the Delta variant because this version is spreading easily between people and causing more severe illness.”    According to the Centers for Disease Control and Prevention (CDC), COVID-19 vaccines are effective, with only a small percentage of those fully vaccinated becoming infected with the virus.    “It is true that no vaccine prevents illness 100 percent of the time,” Dr. Matthew Zahn said in an Aug. 6 statement. “Yes, you can still get COVID-19 if you are vaccinated, but it’s important to know that fully vaccinated people are much …