How many Salmonella enteritidis cells are required to infect a chick at 3 weeks?

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Multiple Choice

How many Salmonella enteritidis cells are required to infect a chick at 3 weeks?

Explanation:
Age affects how many Salmonella enteritidis cells are needed to establish infection. As a chick matures, its gut defenses and resident microbiota strengthen, so a larger infectious dose is required to overcome those barriers. For a chick around three weeks old, about one million bacterial cells are typically needed to reliably cause infection in a significant portion of birds. That’s why the million-cell dose best fits this age group—the smaller doses are unlikely to produce infection consistently in a 3-week-old chick.

Age affects how many Salmonella enteritidis cells are needed to establish infection. As a chick matures, its gut defenses and resident microbiota strengthen, so a larger infectious dose is required to overcome those barriers. For a chick around three weeks old, about one million bacterial cells are typically needed to reliably cause infection in a significant portion of birds. That’s why the million-cell dose best fits this age group—the smaller doses are unlikely to produce infection consistently in a 3-week-old chick.

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