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nbsp;Roger Lewis, the director of COVID-19 hospital demand modeling for the Los Angeles County Department of Health Services, told the newspaper that an estimated 75% of the county will need to be vaccinated against the virus to achieve herd immunity. 5610bb Anthony Fauci, the nation's leading infectious disease expert, has previously said the spread of variants should serve as a "wakeup call" and a reminder to those involved in vaccine development to be nimble and ready to address new needs should they arise. 5610bb CLICK HERE TO GET THE FOX NEWS APPThe Centers for Disease Control and Prevention (CDC) has released guidlelines on how to safely reopen schools and noted that it is not necessary for all teachers to receive the vaccine before returning to the classroom. 5610bb nbsp;PHOTOS SHOW WHITE HOUSE BEING CLEARED OUT AHEAD OF BIDEN INAUGURATIONThe FBI has warned that there is "chatter" about more violence in the days leading up to the inauguration, which has law enforcement officials across the country on heightened alert. 5610bb