It doesn't sound like a disease. As fast as they seemed to die, I wonder if they got into poison somewhere? Perhaps a neighbor is using poison bait traps? If that's a possibility, then I wouldn't leave the dead or ailing mice out where something might eat them and also be poisoned.
Not sure that there's a more humane way to handle it besides what you're already doing.
Very sad, though.
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"We are--each of us--dying; it's how we live in the meantime that makes the difference."
"It's not what you gather, but what you scatter that tells what kind of life you have lived!"
"Be kinder than necessary, for everyone you meet is fighting some kind of battle."
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