Providing safe drinking water is the single most important measure needed to prevent epidemics when water supplies are destroyed or polluted.

The knowledge of how H.I.V. developed could someday help scientists prevent similar epidemics.

They may also assist in preventing or controlling epidemics and outbreaks of disease.

It is important to know how each different kind of virus is spread to prevent infections and epidemics.

The purpose was to link all the country's provincial centers of health and epidemic prevention in an effort to improve the system for preventing epidemics.

During this period, public health authorities began pressing for better waste disposal systems to be installed, to prevent or control epidemics of disease.

They also help reduce the spread of disease to others and prevent epidemics.

This immediate need will subsequently be replaced by a requirement for medicine to prevent epidemics, which have apparently already broken out, and aid for reconstruction.

Now, our responsibility is firstly to respond to the emergency (with drinking water, food etc) and to prevent epidemics.

The real major need is for drinking water in order to prevent epidemics.