In the opening sequence, Dr. Keller wakes up with a clear goo on her hand. As she washes it off her hand, the camera view of her face (from the sink) shows a line of it on her right cheek. When the view shifts to her right side, it's gone.
As Dr. Beckett looks at the alien pathogen on his computer, the blood sample (Dr. Keller's) is listed as Athosian. Keller is from Earth and is not Athosian.