multiplicity of infection


Also found in: Dictionary, Acronyms, Encyclopedia, Wikipedia.

multiplicity of infection

The ratio of viral or phage particles to cells in a system to infection targets (e.g., cells in a defined volume).

multiplicity of infection (MOI)

(virology) the ratio of infectious virus particles to susceptible CELLS. A high MOI indicates that a lot of virus particles (VIRIONS) are present in the system, relative to susceptible cells.
References in periodicals archive ?
After the drug was removed, cells were inoculated with either wildtype (WT) virus, which did not contain the H275Y mutation in NA, or oseltamivir-resistant virus with the H275Y mutation (as positive control) at a low multiplicity of infection of 0.
The magnitude and time course of these increases is dependent on both virus strain and multiplicity of infection.
1 PFU, which is equivalent to a multiplicity of infection of 0.