Death rates can change rapidly due to disease epidemics, wars and other mass catastrophes, or advances in medicine.

When human populations were isolated centuries ago, disease epidemics would be localized.

It is important to remember that human remains from explosions and building collapses do not pose a risk of disease epidemics.

At least two major population declines, possibly due to disease epidemics, have occurred in recorded history: in 1909 and 1950.

One reason for the growing popularity of homeopathy was its apparent success in treating people suffering from infectious disease epidemics.

Infectious disease epidemics of the late 18th century caused many fatalities among them.

These factors make modern agriculture particularly prone to disease epidemics.

There is also a growing consensus that rich countries have been stingy in the face of major disease epidemics.

A major change in climate will also bring something quite different: disease epidemics and epizootics among both people and animals.

Wars, famines, and disease epidemics had a dramatic effect on the demographics of Italy.