One death out of 5000 on board IIRCThen that becomes the fault of the higher-ups who make these decisions. It's not the right of the captain to take the law into his own hands. That's a bigger danger than the virus.
And do keep in mind that from everything we're learning about the real death rates, this virus is less dangerous than we assumed. Also, remember who's on an aircraft carrier. It's largely a bunch of young men in good to excellent physical condition. There's probably no group in society more capable of handling this virus than they are.