"We're learning as we go here. This is a new phenomenon."
Hmmmm..... I find it odd that it is "new". There is a post that I did long time ago on blood not being sterile. We know that blood circulates everywhere carrying microbes.
"- indicates that the donor and her organs were screened and didn't show any sign of infection."
I think this is further proof that their testing methods aren't good, which we've been saying all along.