Caduceus USA is the North American branch of Caduceus. It is located in Angeles Bay, California in Under the Knife, Second Opinion, and Under the Knife 2. It is at the forefront of countering emerging diseases. Caduceus USA is a subdivision functioning independently with multiple US branches (Including the eastern branch first shown in New Blood). Working for the betterment of people's health, it is known for its medical prominent achivement. Although it has been the subjigation of terrorist attacks, the swift action taken by Caduceus and it's doctors thwarted both terrorism and disease released by them.