scrub every inch of the ship. this was the view from the deck on saturday. as passengers partied, a coast guard helicopter hovering above on a mission to collect a blood sample from the dallas lab supervisor who handled blood samples from thomas eric duncan. even though she didn t have a fever, she d been quarantined in her cabin for days. when it first came out, there was kind of panic. reporter: around the time the boat docked, word she tested negative for the virus. she was allowed to go home. critical time for the 75 dallas health care workers who treated duncan. we re right in the middle of a hot zone right now. so we re doing a whole lot of work. reporter: nina pham, the first nurse to contract the disease, still in isolation. it s a serious disease and it kind of knocks you out. it s mostly really being fatigued, but she s in very good spirits. reporter: authorities tracing the contacts of amber vinson who