Apple has issued an internal memo to their corporate and store employees notifying them of their new COVID-19 booster shot mandate. Employees will have four weeks after they become eligible for a booster to receive their additional dose. They will also be instituting a weekly rapid antigen testing program for unvaccinated employees starting January 24th. Starting February 15th, employees who don’t comply with the booster requirement will also have to undergo weekly testing.
See "Apple to require workers to get COVID-19 booster shots", Adam Barnes, The Hill, January 18, 2022