A type of infectious spread in which a singular source affects all individuals

Common source spread

A type of infectious spread that spreads from person-to-person, whether directly or indirectly; each individual perpetuates more infection, leading to no single source of infection. When not contained, this spread can last for an extended period (longer than pathogen incubation period)

Propagated spread

Types of infectious spread include:
- Common source spread
- Propagated spread

University of Notre Dame

The "Father of epidemiology"; Found the source of the 1854 Broad Street cholera epidemic. He hypothesized that microbe was the infectious agent and the source of the outbreak was due to fecal-oral transmission, supporting the germ theory of disease. Upon investigation, Snow found that choleric individuals were being infected from the same contaminated water source and mapping and traced the area of high incidence to a specific water pump on Broad Street, which was fed by a common source spread. This finding led to a public health response in removing the pump and thus containing the epidemic.

(Photo credits in References)

John Snow

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

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

OpenStax Biology 2nd Edition

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.

OpenStax Microbiology Textbook

Types of Infectious Spread

John Snow (Figure 16.5). Reprinted from OpenStax Microbiology (p. 300), by N. Parker, M. Shneegurt, A.-h. Thi Tu, B. M. Forester, and P. Lister, 2016, Rice University. Copyright 2016 by Rice University.

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