The infectious dose
A) is the same for all microorganisms.
B) may be 10-100 cells for Salmonella.
C) is defined as the number of microbes needed to cause infection.
D) is defined as the number of microbes needed to kill the host.
E) is the same for all bacteria but varies for viruses.

Question

The infectious dose
A) is the same for all microorganisms.
B) may be 10-100 cells for Salmonella.
C) is defined as the number of microbes needed to cause infection.
D) is defined as the number of microbes needed to kill the host.
E) is the same for all bacteria but varies for viruses.

Quizplus · Accepted Answer

The infectious dose is defined as the number of microbes needed to cause infection. This may vary for different microorganisms and may even differ within the same species. Therefore, option A, B, D, and E are incorrect.

The Infectious Dose