Fatal outcome of bacteraemic patients caused by infection with staphylokinase-deficient Staphylococcus aureus strains.
Staphylokinase (SAK) is a plasminogen-activator protein produced by Staphylococcus aureus. SAK production was evaluated in vitro in S. aureus isolates from the bloodstream of patients with lethal (n = 56) and non-lethal (n = 57) bacteraemia and from anterior nares of healthy subjects (n = 48). Most isolates (93/161) produced SAK, and 68 % of SAK-producing isolates expressed both surface-bound and secreted types of SAK. SAK production was significantly less common among isolates from patients with lethal bacteraemia (39 %) than isolates from patients with non-lethal bacteraemia (68 %) or nasal carriage isolates (67 %) (P < 0.01). After adjusting for infection with methicillin-resistant S. aureus and APACHE II score, patients infected with SAK-deficient isolates were 4.3 times more likely to have lethal bacteraemia than patients whose infecting isolate produced high levels of SAK (> or =5 microg ml(-1)), suggesting that in vitro SAK production was inversely associated with clinical outcome among patients with S. aureus bacteraemia. The high frequency of SAK production in nasal isolates and in cases with uncomplicated bacteraemia suggests that SAK may be one of the adaptive mechanisms of S. aureus symbiosis with the host.
Jin
Tao
T
Department of Rheumatology and Inflammation Research, Sahlgrenska University Hospital, Guldhedsgatan 10, S-413 46 Göteborg, Sweden 2Department of Agronomy, Purdue University, West Lafayette, IN, USA 3Division of Infectious Diseases, Duke University Medical Center, Durham, NC, USA.
Bokarewa
Maria
M
Department of Rheumatology and Inflammation Research, Sahlgrenska University Hospital, Guldhedsgatan 10, S-413 46 Göteborg, Sweden 2Department of Agronomy, Purdue University, West Lafayette, IN, USA 3Division of Infectious Diseases, Duke University Medical Center, Durham, NC, USA.
McIntyre
Lauren
L
Department of Rheumatology and Inflammation Research, Sahlgrenska University Hospital, Guldhedsgatan 10, S-413 46 Göteborg, Sweden 2Department of Agronomy, Purdue University, West Lafayette, IN, USA 3Division of Infectious Diseases, Duke University Medical Center, Durham, NC, USA.
Tarkowski
Andrej
A
Department of Rheumatology and Inflammation Research, Sahlgrenska University Hospital, Guldhedsgatan 10, S-413 46 Göteborg, Sweden 2Department of Agronomy, Purdue University, West Lafayette, IN, USA 3Division of Infectious Diseases, Duke University Medical Center, Durham, NC, USA.
Corey
G Ralph
GR
Department of Rheumatology and Inflammation Research, Sahlgrenska University Hospital, Guldhedsgatan 10, S-413 46 Göteborg, Sweden 2Department of Agronomy, Purdue University, West Lafayette, IN, USA 3Division of Infectious Diseases, Duke University Medical Center, Durham, NC, USA.
Reller
L Barth
LB
Department of Rheumatology and Inflammation Research, Sahlgrenska University Hospital, Guldhedsgatan 10, S-413 46 Göteborg, Sweden 2Department of Agronomy, Purdue University, West Lafayette, IN, USA 3Division of Infectious Diseases, Duke University Medical Center, Durham, NC, USA.
Fowler
Vance G
VG
Department of Rheumatology and Inflammation Research, Sahlgrenska University Hospital, Guldhedsgatan 10, S-413 46 Göteborg, Sweden 2Department of Agronomy, Purdue University, West Lafayette, IN, USA 3Division of Infectious Diseases, Duke University Medical Center, Durham, NC, USA.
D000367:Age Factors; D000368:Aged; D016470:Bacteremia / Q000382:microbiology* / Q000401:mortality; D005260:Female; D006801:Humans; D016015:Logistic Models; D008297:Male; D008666:Metalloendopeptidases / Q000172:deficiency* / Q000378:metabolism; D016106:Methicillin Resistance; D009297:Nasal Mucosa / Q000382:microbiology; D012307:Risk Factors; D012737:Sex Factors; D013203:Staphylococcal Infections / Q000097:blood / Q000382:microbiology* / Q000401:mortality; D013211:Staphylococcus aureus / Q000201:enzymology* / Q000472:pathogenicity; D014774:Virulence
D008666:Metalloendopeptidases; C022653:auR protein, Staphylococcus aureus