21.   If carbon monoxide accumulates, it can become deadly, though early symptoms, such as drowsiness and dizziness, can seem innocuously commonplace.

22.   Its early symptoms, which can take weeks to emerge, include fever, vomiting, and delirium.

23.   More people are lining up earlier for flu shots this season, Atlanta-area doctors report, perhaps because early symptoms of inhaled anthrax mimic influenza.

24.   No matter how much you pet and touch your animal, finding early symptoms of disease requires a more focused approach.

25.   People who showed the early symptoms of the disease were quarantined for years, sometimes decades.

26.   The disease, which has the early symptoms of a simple bladder infection, is often misdiagnosed.

27.   The early symptoms are much like those of flu and other respiratory diseases.

28.   The early symptoms can be deceptively similar to colds and flu.

29.   The early symptoms are much like those of flu and other respiratory diseases that strike millions of people each winter.

30.   The early symptoms of the illness are fever, dizziness, confusion and a flat, red rash over large parts of the body.