The remarkable increases in life expectancy over the past several decades are due mainly to breakthroughs in treating

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Infectious diseases have been the leading cause of death throughout human history. In the past, most people died from infectious diseases such as smallpox, measles, and tuberculosis. Today, thanks to advances in public health and medical care, infectious diseases are no longer a major cause of death in developed countries.

The Remarkable Increases in Life Expectancy Over the Past Several