The nation's largest supermarket chain on Tuesday delivered a salvo toward their unvaccinated workers.

Starting Jan. 1, unvaccinated Kroger employees will no longer be eligible to receive up to two weeks of paid emergency leave if they become infected, and some on the company’s health insurance plan will see a $50 monthly surcharge.

The changes were first reported by the Wall Street Journal.

The move comes amid surging cases of COVID-19 and as more employers implement ways to encourage workers to get vaccinated.

Cincinnati-based Kroger will still provide paid leave to fully vaccinated employees who get breakthrough cases and offer a $100 incentive to all employees who become fully vaccinated.

“As we prepare to navigate the next phase of the pandemic, we are modifying policies to encourage safe behaviors including vaccination,” a Kroger spokeswoman said in a statement to CNBC on Tuesday.