Table 2 Clinical exposures of cases.

Exposure	Number of cases
Parenteral nutrition	91
Central vascular access	89
Mechanical ventilation	90
Any antibiotics	92
• Aminoglycosides	80
• Vancomycin/teicoplanin	75
• Cephalosporins	64
Postnatal steroids	18
H2 receptor antagonists	16
Peritoneal dialysis	3