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

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

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

Steps: 6

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.