Tyson Foods Inc (TSN.N), Microsoft Corp (MSFT.O), and Detroit’s Big Three automakers have joined a growing list of American corporations altering their vaccination and masking policies as the Delta strain triggers additional pandemic limitations.

Microsoft said on Tuesday that all workers, vendors, and visitors will be required to provide confirmation of Covid-19 vaccination to enter its US premises, while meatpacker Tyson Foods announced that vaccines will be mandatory for its staff.

Tyson Chief Executive Donnie King said, “We did not take this decision lightly, we have spent days encouraging our team members to get vaccinated – today, half of our team members are.”