Protein C
Cameron finds Alfredo's blood is not clotting, indicating minor DIC, and Cuddy shocks the staff by ordering Protein C. Alfredo becomes unable to move his arm and Chase tells Cuddy the protein C caused bleeding in Alfredo's brain. The treatment is stopped, and Alfredo is rushed into neurosurgery. As Cameron examines him, Alfredo suffers a coughing fit; a chest X-ray shows lung infiltration, and Foreman suggests pneumonia. Chase mentions that Alfredo has a low titer for chlamydia antibodies, but is dismissed by Foreman because the chest X-rays do not match chlamydial pneumonia.