This book provides one of the first in-depth presentations of insights from evolutionary biology on various fields in health science, including epidemiology and medicine.

[2] Infectious diseases can be obtained through many routes of transmission such as inhalation, open wounds, sores, ingestion, sexual intercourse, and insect bites.

[3] Author, Paul Ewald used his book to expound upon infectious diseases in humans and animals, explain various routes of transmission as well as epidemiology as a whole.

The extensive research about pathogens shows that they can evolve within a month, whereas animal hosts such as humans take centuries to make large evolutionary changes.

If an organism lives a moderately healthy lifestyle, including its diet, physical activity, and decreased stress, its chances of fighting off infectious diseases increase.

[9] The second experiment focused more on zoonotic pathogens being correlated with emerging infectious diseases in humans.