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Which of the following is the most infectious?

Which of the following is the most infectious?

Human Anatomy & Physiology (11th Edition)
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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**Question 3:** Which of the following is the most infectious? | Genus | ID₅₀ | |-------------|------------| | *Legionella* | 200 cells | | *Salmonella* | 10⁵ cells | | *Shigella* | 50 cells | | *Clostridium*| 10³ cells | **Explanation:** The ID₅₀, or infectious dose 50, is the number of pathogen cells required to infect 50% of a test population. The lower the ID₅₀ value, the more infectious the organism is, as fewer cells are needed to cause infection. In this table: - *Legionella* requires 200 cells to infect. - *Salmonella* requires 100,000 cells (10⁵) to infect. - *Shigella* requires 50 cells to infect. - *Clostridium* requires 1,000 cells (10³) to infect. Based on the ID₅₀ values, *Shigella* is the most infectious, as it requires the smallest number of cells to cause infection.
Transcribed Image Text:**Question 3:** Which of the following is the most infectious? | Genus | ID₅₀ | |-------------|------------| | *Legionella* | 200 cells | | *Salmonella* | 10⁵ cells | | *Shigella* | 50 cells | | *Clostridium*| 10³ cells | **Explanation:** The ID₅₀, or infectious dose 50, is the number of pathogen cells required to infect 50% of a test population. The lower the ID₅₀ value, the more infectious the organism is, as fewer cells are needed to cause infection. In this table: - *Legionella* requires 200 cells to infect. - *Salmonella* requires 100,000 cells (10⁵) to infect. - *Shigella* requires 50 cells to infect. - *Clostridium* requires 1,000 cells (10³) to infect. Based on the ID₅₀ values, *Shigella* is the most infectious, as it requires the smallest number of cells to cause infection.
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