The body is a cell state in which every cell is a citizen. Disease is merely the conflict of the citizens of the state brought about by the action of external forces. — Rudolf Virchow Copy Share Image
... [I]nfectious disease is merely a disagreeable instance of a widely prevalent tendency of all living creatures to save themselves the bother of building, by their own efforts, the things they require. Whenever they find it possible to take advantage… — Hans Zinsser Copy Share Image
![“... [I]nfectious disease is merely a disagreeable instance of a widely prevalent tendency of all living creatures to save themselves the bother of building, by their own efforts, the things they require. Whenever they find it possible to take advantage of the constructive labors of others, this is…” quote by Hans Zinsser](https://sms4smile.com/quotes/img-quotes/0c7/hans-zinsser-34557_advantage_i-nfectious-disease-is-merely-a-disagree_1503200.jpg)