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Table 1 Pathogenicity profiles of Listeria species isolated from buffalo and cow milk

From: Determination of virulence and antibiotic resistance pattern of biofilm producing Listeria species isolated from retail raw milk

Source of milk samples Listeria species Serotype Pathogenicity profile  
CAMP (+/-) with S/R PI-PLC DLABN DAPN Anton’s eye test Mice lethality Chick-embryo lethality Vero cell ingestion assay Biofilm
Microtiter plate assay Christensen’s tube
(ATCC 7494) monocytogenes 4 +/- + - - + + + ++ Strong (O.D. = 0.158) Strong
Buffalo monocytogenes 1 +/+ + - - + + + ++ Strong (O.D. = 0.148) Moderate
innocua   - - + + - - - - Strong (O.D. = 0.167) Strong
seelegeri   - - + + - - - - Strong (O.D. = 0.144) Moderate
seelegeri   - - + + - - - - Strong (O.D. = 0.157) Moderate
welshemeri   - - + + - - - - Strong (O.D. = 0.145) Weak
welshemeri   - - + + - - - - Strong (O.D. = 0.141) Weak
grayi   - - + + - - - - Weak (O.D. = 0.0995) Moderate
grayi   - - + + - - - - Strong (O.D. = 0.134) Moderate
Cow monocytogenes 4 +/- + - - + + + ++ Strong (O.D. = 0.123) Strong
innocua   - - + + - - - - Strong (O.D. = 0.125) Strong
seelegeri   - - + + - - - - Weak (O.D. = 0.074) Moderate
seelegeri   - - + + - - - - Very Strong (O.D. = 0.231) Moderate
welshemeri   - - + + - - - - Strong (O.D. = 0.128) Moderate
welshemeri   - - + + - - - - Strong (O.D. = 0.121) Moderate
welshemeri   - - + + - - - - Strong (O.D. = 0.117) Moderate
L. grayi   - - + + - - - - Strong (O.D. = 0.173) Weak
  1. CAMP Christie, Atkins, Munch-Petersen test, S/R Staphylococcus aureus/Rhodococcus equi, PI-PLC phosphatidylinositol-specific phospholipase C, DLABN DL-alanine-b-naphthylamide HCl, DAPN D-alanine-p-nitroanilide, O.D. Optical Density, O.D. 595 < 0.1 = Weak; O.D. 595 ≤ 0.1 = Strong; O.D. 595 > 1 = Very Strong