The infectious agent is transferred from a reservoir to a susceptible host by direct contact or droplet spread.

Direct Transmission of Infection

Infectious agent is transferred from a reservoir to a susceptible host through airborne spread, vehicles, or vectors.

Indirect Transmission of Infection

- Direct Transmission of Infection
- Indirect Transmission  of Infection 

University of Michigan - Ann Arbor

Transmission occurs when an infectious agent or pathogen exits its reservoir through a portal of exit, is carried to a portal of entry through a mode of transmission, and infects a susceptible host. 

Transmission of Infection

Centers for Disease Control and Prevention. (n.d.). Centers for Disease control and Prevention. Centers for Disease Control and Prevention. https://www.cdc.gov/. 

Centers for Disease Control and Prevention

Modes of Transmission of Infection

Delamater, P. L., Street, E. J., Leslie, T. F., Yang, Y. T., & Jacobsen, K. H. (2019). Complexity of the basic reproduction number (R0). Emerging infectious diseases, 25(1), 1.

Complexity of the Basic Reproduction Number (R0)

The epidemiologic metric used to describe the transmissibility of an infectious agent by indicating the number of secondary cases one case is expected to produce at a most basic level.
An infectious disease outbreak is expected to continue if R0 is greater than 1 and discontinue if R0 is lesser than 1. 

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