The term used to designate how many bacteria or viruses are required to kill 50% of an experimental group of hosts is A) ID₅₀. B) LD₅₀. C) pathogenicity. D) infectivity. E) virulence.

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The term "LD50" stands for "Lethal Dose, 50%" and is used to designate the amount of a substance, such as bacteria or viruses, required to kill 50% of an experimental group of hosts.

The Term Used to Designate How Many Bacteria or Viruses