Table 3.

Summary of inhibitory activity of nisin P and A against different natural nisin producers.

Strain	Activity nisin P	Activity nisin A	MIC nisin P	MIC nisin A
L. lactis NZ9800 (nisin A)	++	+	8.5 μM	26 μM
S. uberis strain 42 (nisin U)	++	+++	4.25 μM	0.4 μM
S. hyointestinalis DPC6484 (nisin H)	−	−	−	−
S. agalactiae DPC 7040 (nisin P)	+	+++	17 μM	0.022 μM

−, No activity; +, 1 mm radius inhibition zone; ++, 1–5 mm radius inhibition zone; +++, >5 mm inhibition zone.