21.   The disease is highly contagious.

22.   The disease is not curable, and patients must have realistic expectations.

23.   The disease is serious, and in a small percentage of cases it can be fatal.

24.   The disease is still fairly common in many countries.

25.   The disease is under the control of a single dominant gene.

26.   The disease of tuberculosis is more dangerously infectious than that of leprosy....

27.   The failure to find a vaccine for leprosy led scientists early on to conclude that the disease was hopeless.

28.   This disease is more common in people who smoke heavily.

29.   When it comes to drawing a road map of the brain, disease is often the best cartographer.