The Plague Cycle : The Unending War Between Humanity and Infectious Disease Subclass_GENERAL SOCIAL STUDIES Avery's workaholic aunt

Avery's workaholic aunt

Global warming

chart-topping singles and a number one album in America

before The Smurfs can stuff their stockings and open their presents

Ruby jumps on a plane

The Plague Cycle : The Unending War Between Humanity and Infectious Disease Subclass_GENERAL SOCIAL STUDIES Avery's workaholic auntFor four thousand years, the size and vitality of cities, economies, and empires were heavily determined by infection. Striking humanity in waves, the cycle of plagues set the tempo of civilizational growth and decline, since common response to the threat was exclusion quarantining the sick or keeping them out. But the unprecedented hygiene and medical revolutions of the past two centuries have allowed humanity to free itself from the hold of epidemic