Active Phage Therapy Calculator

∞ generated and posted on 2022.07.07 ∞

Calculation of extent of bacterial reduction after some defined span of time and allowing for in situ phage population growth over that time span.

Please cite as:

Stephen T. Abedon
Active Phage Therapy Calculator.
active.phage-therapy.org


Click here for calculator or see immediately below for further explanation and discussion.

This calculator simulates phage-bacterial community dynamics, providing various end-point values such as phage and bacterial concentrations, comparing these to starting values

The underlying simulations are incremented in intervals of 1 min, can include or not include free phage inactivation for reasons other than phage adsorption to bacteria, can include bacterial replication (as controlled by the Malthusian parameter), and can be varied in terms of starting phage titers, starting bacterial concentrations, duration of simulations, phage adsorption rate constant, phage latent period, and phage burst size.

MOIinput (MOI input) is defined as the ratio of phages added to phage-targeted bacteria.

See the following for discussion of modeling phage-bacterial community dynamics:

Stopar, D., Abedon, S. T. (2008). Modeling bacteriophage population growth. In: Bacteriophage Ecology, Abedon, S. T. (ed), Cambridge University Press, Cambridge. pp. 389-414.

Abedon, S. T. (2009). Deconstructing chemostats towards greater phage-modeling precision. In: Contemporary Trends in Bacteriophage Research, Adams, H. T. (ed), Nova Science Publishers, Hauppauge, New York. pp. 249-283.

For an open access discussion, see




= L

= B

= m
above is set to 2.5 if left blank or not a number or ≤ 0
= n
above is set to -9 if left blank or not a number or > 0

k value is defaulted at 2.5 × 10-9 ml-1 min-1 from Stent (1963)
may be greater or lower but must be defined to calculate MOIactual
the larger the number, the faster the phage adsorption

= m
above is set to 1 if left blank or not a number or ≤ 0
= n
above is set to 0 if left blank or not a number or < 0

= IP
above is set to 0 if left blank or not a number or < 0
set to zero for no free phage inactivation

= m
above is set to 1 if left blank or not a number or ≤ 0
= n
above is set to 0 if left blank or not a number or < 0

= u
above is set to 0 if left blank or not a number or < 0
the larger the number, the faster bacterial replication
set to zero for no bacterial replication

= IN
above is set to 0 if left blank or not a number or < 0
set to zero for no phage-free bacterial inactivation

= t