1.   All three factors are thought to have played a part in the rapid spread of the disease.

2.   Close contact between people resulted in the rapid spread of the disease.

3.   The rapid spread of small arms and light weapons facilitate the recruitment of child soldiers.

4.   The rapid spread of the disease has alarmed many people.

5.   Yet, because of its sudden start and rapid spread, AIDS could soon wipe out this progress.

6.   The motor of this growth has been the rapid spread of corporate computerization and personal receivers, the relative prices of which have been reduced substantially over time.

7.   The result has been a rapid spread of unsightly buildings across the countryside.

8.   Among other concerns, the church is deeply worried about the rapid spread of secularism and Protestantism in Latin America, the greatest concentration of Catholics in the world.

9.   And he is very worried about the rapid spread of spiral CT screening for lung cancer.