Fig. 2. Illustrations of the intra-hospital transportation routes with (A) or without (B) code air. The numbers following CT, MRI, or EV indicate the individual room numbers. Code air is the institutional countermeasure against airborne infection in transportation. The dashed lines indicate the routes in which patients are transported. At our hospital, both CT and MRI are available, regardless of the suspected infection. CT 3 or MRI 2 is used when code air is announced, while CT 1 or MRI 1 is used when it is not. After diagnostic imaging, if mechanical thrombectomy is indicated, patients are transported to the angiography suite on the third floor using separate elevators. ER: emergency room; EV: elevator; NPER; negative pressure emergency room.