Biological transmission differs from mechanical transmission in that involves specific diseases.
Mechanical transmission can be described as the mode of transmission in which pathogens for disease travel from the host to another person without any direct contact of the person with the host.
On the other hand, biological transmission occurs when there is specific contact between the individual with the infected host. Biological transmission of diseases is specific to a number of diseases. The biological transmission route for infection for each pathogen can be different.
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