Sanicom is correct. Additionally, contractual force majeure specifically considers, epidemics, so a contractual challenge is likely to fail.

Force majeure is a common clause in contracts which essentially frees both parties from liability or obligation when an extraordinary event or circumstance beyond the control of the parties, such as a war, strike, riot, crime, epidemic or sudden legal changes prevents one or both parties from fulfilling their obligations under the contract.

https://en.wikipedia.org/wiki/Force_majeure

https://www.akerman.com/en/perspecti...contracts.html