In an Experiment to Determine the Infectious Dose for a Specific

Multiple Choice

In an experiment to determine the infectious dose for a specific organism, 50% of the test subjects must develop the disease following a specific dose. This is quantified as the (ID₅₀) and is a measure of the pathogenicity of that organism. Assess the following data from an experiment involving 200 mice and determine the ID₅₀ for the infectious agent. Infectious Dose Living Mice Dead Mice
10³ 190 10
10⁴ 150 50
10⁵ 120 80
10⁶ 100 100
10⁷ 0 200

A) 10³ organisms
B) 10⁴ organisms
C) 10⁵ organisms
D) 10⁶ organisms