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Table 4 Virulence assessment of the S. aureus strain collection

From: Antimicrobial peptides effectively kill a broad spectrum of Listeria monocytogenes and Staphylococcus aureus strains independently of origin, sub-type, or virulence factor expression

Strain Hemolysis Staph. kin. Catalase Carotenoid Enterotoxin TSST-1 C. elegans Blood
      A B C D    
8325-4 +++ - a ++ + - - - - - 184 2.4 × 108
Sa113 - - ++ ++ - - - - -   
ΔmprF - - ++(+) ++ - - - - -   
ΔdltA - - +(+) + - - - - -   
14943 - - ++(+) +++ +++ - - - +++ 157 7.6 × 108
15033 ++ - +++ +++ - +++ - - -   
B31369 ++ - ++(+) +++ - +++ - - - 140 1.1 × 108
796 (+) - ++(+) +++ - - - - - 223 2.5 × 108
J15033 (+) - ++ +++ - - - - -   
2148-jvi - - ++(+) ++ - - - - - 256 3.0 × 106
K3-B2 + - ++ ++ - - - - - 225 3.4 × 107
B29997 (+) - ++(+) +++ - - - - -   
KES439 (+) - ++ ++ - - - - -   
KES626 +++ - a ++(+) + - - - - - 118 1.0 × 109
KES735 (+) - ++ +++ - - - - -   
KES855 ++ - ++ ++ - - - - -   
  1. a A clearing zone on both plates with and without added serum indicate a high production of proteases.
  2. Tests include hemolytic activity, staphylokinase activity, catalase activity, carotenoid production and production of exotoxins. A sub-selection of strains were tested for their killing kinetics against C. elegans (time to 50% mortality, h) and their ability to survive and grow in human whole blood (cell density after 24 h, CFU/ml).