No. Let me clarify. I am in favour of quarantine officers at crossing points, because I understand that the international regulations, as proposed, would have a land-based conveyance report somebody who was sick at the border, if they still had that sick person on board—if they hadn't off-loaded them to a hospital, which I hope they would have done. I support quarantine officers at airports and at ships as well.
My point was that, given the length of incubation periods of many of these diseases, you'll probably only get the disease manifesting itself on board a ship, because of the time the ship is in transit. The chances of somebody developing an illness in the 12 hours that they might be on a airplane, and developing symptoms to the point where they become symptomatic and obvious, is somewhat limited.
Our efforts at detecting people with increased temperatures at airports in Vancouver during SARS, where we had thermal scanners at every airport, didn't pick up a single case of serious illness. They may have picked up a number of people with slightly elevated temperatures, but not a single case of SARS was prevented from entering the country by means of that screening mechanism.