
Concept explainers
To review:
The differences between infection and disease, pathogenicity and virulence, and LD50 and ID50.
Introduction:
Microorganisms cannot be seen with naked eyes but they are distributed everywhere in the surrounding such as soil, water, air, and also within other organisms. Certain microbes are adapted to grow in extreme conditions. Some of the microbial species have proved to be extremely beneficial to the humankind while others exhibit negative impact.

Explanation of Solution
The different forms of microbes such as bacteria, viruses,
1. Disease and infection:
2. Pathogenicity and virulence:
3. LD50 (lethal dose) and ID50 (infectious dose):
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Chapter 25 Solutions
Microbiology: An Evolving Science (Fourth Edition)
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