In microbiology, the multiplicity of infection or MOI is the ratio of agents (e.g. phage or more generally virus, bacteria) to infection targets (e.g. cell). For example, when referring to a group of cells inoculated with virus particles, the MOI is the ratio of the number of virus particles to the number of target cells present in a defined space.

In a nutshell, MOI is the ratio of infectious agents to infection targets. In many cases, it is the ratio of viral particles to target cells in a defined space, such as a cell culture well.

MOI (Multiplicity of Infection) is used to determine the ratio between the number of viral particles and host cells. The formula is the number of viral particles divided by the number of host...

The multiplicity of infection or MOI represents the ratio of the numbers of virus particles to the numbers of the host cells in a given infection medium. A value of MOI = 1 implies that on an average there is a single host cell for a single phage particle. However, in reality there can be multiple phage particles adsorbed on a single host cell ...

Jan 13, 2011 · You determine the MOI by adding a certain amount of virus to a fixed number of cells. The MOI is the number of infectious viruses added divided by the number of cells. If you have a million cells in a culture dish, and you add a million PFU, the MOI is one.

Answer: Multiplicity of infection (MOI) refers to the number of viral particle (s) present relative to host cell (s). For example, if one million viral particles are added to one million cells, the MOI is 1.0. If 100,000 viral particles are added to one million host cells, the MOI is 0.1.

Our results show that the MOI is below one genome per cell in companion cells primarily infected from the vasculature, resulting in the coexistence of several clonal lineages initiated from distinct infection foci within a single leaf.

The concept of bacteriophage multiplicity of infection (MOI) – ratios of phages to bacteria – historically has been less easily applied than many phage workers would prefer or, perhaps, may be aware. Here, toward clarification of the concept, I ...

Multiplicity of infection (moi) is the average number of virus particles infecting each cell. TCID 50 is the tissue culture infectious dose which will infect 50% if the cell monolayers challenged with the defined inoculum.

In this protocol, S.aureus cells are to be grown to their early logarithmic phase (OD 600 =0.5) and then infected with phage by using different MOI ratios (MOI= 0.01, 0.1, 1, 10, 100).