Bacteriophage Ecology Group

Bacteriophage Ecology Group Bacteriophage Ecology Group

Multiplicity of Infection (MOI)

Literally the ratio of adsorbed or infecting phages to total bacteria.

 CAUTION: AMBIGUOUS TERM 

Often mistakenly used to describe the ratio of added phages to total bacteria.

The adsorbed ratio is also described as MOIactual whereas the added ratio can be referred to as MOIinput. This is the definition from Adams (1959, InterScience, p. 441): "Ratio of adsorbed phage particles to bacteria in a culture."

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