1.   Diseases can be spread by dirty water.

2.   Diseases were spread through poor sanitary conditions.

3.   However, there is no scientific proof that the disease can be spread by eating contaminated beef.

4.   Large and centralized food production embodies the potential to spread disease to tens of thousands of people in a matter of hours.

5.   The disease is only spread by direct contact between people.

6.   The shortage of cooking energy not only causes problems with nutrition, but also spreads disease.

7.   It effectively spread the disease all over the continent and drastically reduced the rabbit population.

8.   Two years ago, when he was in London, Ontario, he was thought to be spreading the disease through promiscuous sex.

9.   Also, drought pushes normally scattered herds together in the hunt for fresh grass, spreading the disease.