Foreign doctors have all kinds of different forms of training. But many are united by one common factor that seems to be operative especially in the Commonwealth countries — a great emphasis on the bedside exam and on clinical skills. In part, [this approach] was driven by the lack of ready access to all the kinds of sophisticated testing that we have now. But I think that kind of clinical training still serves me very well.
3,500 calories = 1 pound, so 3,500 would be the answer.
If the disease is communicable, it is contagious. If it is airborne, it is transferred through the air, as opposed to physical touch or blood-borne. Being in a confined space, such as an ambulance, with an airborne communicable disease means you have most definitely been exposed to it.
I would not suggest it. Anything can happen on a boat.