The world must stand together to prevent the spread to these weapons.

Their presence is supposed to prevent the spread of war from the north.

Several years ago, when this disease was very much in the news, many methods to prevent its spread were used.

It is very important that every measure be taken to prevent its spread.

This also helped to prevent the spread of fire, in the event that one would break out.

They also help prevent the spread of diseases from one country to another.

The best management solution is to prevent the spread of disease.

There is however no scientific evidence that these prevent the spread of disease.

It is believed that this will help prevent the spread of cancer.

The following steps can prevent the spread of other infections.