@gingercorless, Please accept a virtual hug from me. I transplanted in 2009 and even though that was long before Covid19, I can understand your feelings. Has your husband been temporarily inactivated from the transplant list? That happened for me for a different reason- and it was a real disappointment that I remember very clearly. How long until you husband will be eligible to be retested and reactivated?
I hope he will remain symptom free (and you, too).

What have the doctors told you about what to expect after he gets a negative test?