Some medical personnel are not aware of the possible extent of the problem and may misdiagnose what on the surface looks like a simple case of the flu. Carbon monoxide kills by replacing oxygen in the blood. High levels kill in a short period. Moderate levels, because CO is a cumulative poison, can cause misdiagnosed health problems or even death. Low levels over a long period can cause health problems, especially for patients at risk.
Exposure can result in long lasting or permanent effects including brain damage.
After exposure, merely removing the victims from the area is not enough. Some form of medical attention is required. The most effective treatment uses a hyperbaric chamber, where, under pressure, the CO is quickly replaced with oxygen. While on faculty improvement leave in England, I spent time with British Gas observing their efforts to reduce carbon monoxide risks. England recognizes the problem and now requires persons who deal with CO situations be trained and licensed.