The cause of disease. Can be discerned using molecular Koch's postulates

Etiologic/Causative Agent

Robert Koch was a German physician who became the first to definitively demonstrate the connection between a single, isolated microbe and a known human disease. Between 1867 and 1906, Koch and his colleagues determined the causative pathogens for numerous bacterial infections, successfully identifying the specific bacteria responsible for severe diseases such as anthrax, cholera, and tuberculosis.

Robert Koch

Etiology refers to the study of causes of diseases

University of Notre Dame

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Features of Epidemiology include:

- Etiology
- Disease transmission
- Morbidity
- Morbidity rate
- Mortality
- Mortality rate

Features of Epidemiology

Psychopathology refers to either the study or manifestation of psychological disorders. 

Psychopathology

OpenStax Concepts of Biology provides the necessary breadth and depth for core Biology concepts.

Link: https://openstax.org/details/books/concepts-biology/

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https://openstax.org/details/books/microbiology/

Microbiology covers the scope and sequence requirements for a single-semester microbiology course for non-majors. The book presents the core concepts of microbiology with a focus on applications for careers in allied health. The pedagogical features of the text make the material interesting and accessible while maintaining the career-application focus and scientific rigor inherent in the subject matter. Microbiology’s art program enhances students’ understanding of concepts through clear and effective illustrations, diagrams, and photographs.

Microbiology is produced through a collaborative publishing agreement between OpenStax and the American Society for Microbiology Press. The book aligns with the curriculum guidelines of the American Society for Microbiology.

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Spielman, R. M., Jenkins, W. J., & Lovett, M. D. (2020, April 22). Psychology (2nd ed.). OpenStax. https://openstax.org/books/psychology-2e/pages/1-introduction

OpenStax Psychology (2nd ed.) Textbook

Etiology

The mechanisms by which diseases are spread

Disease transmission

Morbidity

The number of diseased individuals out of a certain number of individuals in the population

Morbidity rate

Mortality 

The proportion of deaths due to disease in a population at a given point in time

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