minimal infecting dose


min·i·mal in·fect·ing dose (MID),

the smallest quantity of infectious material regularly producing infection; usually expressed as I.D.50, the quantity causing infection in 50% of a suitable series of animals or cells (cell cultures).

min·i·mal in·fect·ing dose

(MID) (min'i-măl in-fekt'ting dōs) The smallest quantity of infectious material regularly producing infection; usually expressed as MID50, the quantity causing infection in 50% of a suitable series of animals or cells (cell cultures).