Hannibal was very pleased when Maggie explained the reasoning behind the scrubs. He didn't expect everybody to know the reasons, what happened to things when they were contaminated, but he had to admit that he was a little put out that he wasn't just immediately obeyed. It was his lab, after all. His space.
He didn't feel the need to expound any upon what Pam had just been told. Maggie summed it up succinctly and without any undue drama. Facts only. He felt his fondness for her grow.
"While you change, I will set up the needles. I'm assuming, Pam, that a simple needle will not penetrate your flesh, but I will still need to get it into the vessel. Otherwise this will not be a clean job at all."