You also could have read the article:

In the Ohio case, "patient zero" had traveled to the Philippines on a missionary trip. (In case you were wondering, he took a plane. Miller explained, "Some Amish fly. Some don't.")

Yeah, and I could have Googled it, too, but I asked here instead. But you got me. I went back to work after the section where they talk about not having a car, internet, or computer.