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Table 2 The revised ABC score

From: Available, Bed-sided, Comprehensive (ABC) score to a diagnosis of Methicillin-resistant Staphylococcus aureus infection: a derivation and validation study

 

Additional points

Yes

No

1. Clinical specimen

 Blood or other aseptic specimena

3

0

 Drained pus

2

0

 Aspirated sputum or surgical site pus

1

0

2. Gram-staining

 White blood cells; ≥ 2+

1

0

 Gram-positive cocci; ≥ 2+

1

0

 The number of gram-positive cocci is greater than that of other bacteria

1

0

3. Local inflammation

2

0

4. Systemic inflammatory responseb

2

0

Diagnostic criteria (Possible total points: 10)

  

  ≤ 4 points: Colonization

  

  ≥ 5 points: Active infection

  
  1. aAscites, pleural fluid, pancreatic fluid, spinal fluid, abscess, or wound
  2. b Fever, chills, rigors, hypotension, or decreased urine output