It will be interesting if it is allowed to play out to the end - that being no new cases on the ship. Then put those results through a strainer and analyze what the differences are between those infected and those not infected. A ship is like a mini-world. If they are permitted to leave too early, nothing meaningful will be learned.

In historic pandemics there were some who were resistant and did not get the disease. A lot is learned about how our immune system fights diseases by analyzing this immunity of certain persons.