If a pathogen has an ID50 of 500 organisms, how many organisms are needed to inf

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Question: If a pathogen has an ID50 of 500 organisms, how many organisms are needed to infect 50% of a population of 1,000 individuals?

Options:

Correct Answer: 500

Solution:

The ID50 is the dose required to infect 50% of the population. Therefore, 500 organisms are needed to infect 50% of the population.

If a pathogen has an ID50 of 500 organisms, how many organisms are needed to infect 50% of a population of 1,000 individuals?

If a pathogen has an ID50 of 500 organisms, how many organisms are needed to infect 50% of a population of 1,000 individuals?

Step 1: Understand what ID50 means. ID50 is the number of organisms needed to infect 50% of a population.
Step 2: Note that the ID50 for the pathogen is given as 500 organisms.
Step 3: Recognize that the population size is 1,000 individuals.
Step 4: Since ID50 is defined as the amount needed to infect 50% of the population, we need to find 50% of 1,000 individuals.
Step 5: Calculate 50% of 1,000, which is 500 individuals.
Step 6: Since the ID50 is 500 organisms, this means that to infect 50% of the 1,000 individuals, you need 500 organisms.

Infectious Dose (ID50) – ID50 refers to the number of organisms required to infect 50% of a given population.
Population Size – Understanding that the ID50 is independent of the total population size when calculating the dose needed to infect 50%.