No. We're talking here about risk management. If a traveller is sick on a flight, we cannot send him or her to the hospital before landing at the airport. This is why it is important that the pilot notify the officials of the destination airport so that they can deploy the required resources and the quarantine officers before landing. If a person is ill on a bus going to Canada, we can always send him or her to the hospital before the bus reaches the border.
On April 18th, 2007. See this statement in context.