Hultin thought about taking precautions, just in case the flu virus was alive, as he hoped it would be. He and Whitney wore masks and sterile gowns; they worked under negative-pressure hoods, like those over kitchen stoves, where the air is swept up and under the hood into an exhaust duct rather than into the room. Those were the same precautions that McKee had established for working with highly dangerous bacteria that cause tularemia, Hultin noted. They were state-of-the-art at the time.
