Well, yes, but it's not OK for someone running a fever during a quarantine period to be out of quarantine. Even with something hard to catch, when that something can't be treated, let alone cured.

But yeah, if the family didn't catch it, and they are out of the incubation period now I do believe - he first got sick 9/24, so the 15th was day 21 - then even people within the outbreak area can relax some.

It is demonstrably hard to get, even with contact with bodily fluids.