ID50

Definition

ID50 (Infectious Dose 50) is a measure of the potency of a pathogen. It represents the number of microbial cells required to cause infection in 50% of a tested population.

5 Must Know Facts For Your Next Test

1. ID50 values can vary significantly between different pathogens.
2. A lower ID50 indicates a more infectious pathogen, as fewer cells are needed to cause infection.
3. Environmental factors and host immunity can influence the ID50 value.
4. Determining the ID50 is crucial for understanding the infectious potential of emerging pathogens.
5. ID50 is often used in conjunction with LD50 (Lethal Dose 50) to assess both infectivity and lethality.

Review Questions

Related terms

LD50:

The dose of a toxin that is lethal to 50% of a tested population.

Pathogenicity:

The ability of an organism to cause disease.

Virulence:

The degree or severity of pathogenicity exhibited by an organism.