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Table 2 MRSA Prevalence and Transmission Risk for 26 Nursing Homes

From: Nursing home characteristics associated with methicillin-resistant Staphylococcus aureus (MRSA) Burden and Transmission

  No. Beds MRSA Admission Prevalencea MRSA Point Prevalence Estimated MRSA Transmission Riskb
NH1 124 3% (3) 8% (8) 5%
NH2 59 4% (2) 22% (22) 19%
NH3 145 8% (8) 30% (30) 24%
NH4 208 9% (9) 19% (19) 11%
NH5 137 10% (5) 25% (17) 16%
NH6 24 11% (11) 7% (7) 0%
NH7 198 12% (12) 22% (22) 11%
NH8 80 13% (13) 25% (25) 14%
NH9 99 14% (7) 27% (27) 15%
NH10 99 16% (16) 31% (31) 18%
NH11 99 16% (16) 37% (37) 25%
NH12 98 16% (16) 39% (29) 27%
NH13 255 20% (20) 42% (42) 28%
NH14 99 21% (21) 16% (16) 0%
NH15 145 22% (11) 34% (34) 15%
NH16 138 22% (22) 30% (30) 10%
NH17 182 25% (25) 39% (39) 19%
NH18 99 29% (29) 44% (44) 21%
NH19 143 31% (31) 52% (52) 30%
NH20 46 ----- 0% (0) n/a
NH21 124 ----- 2% (1) n/a
NH22 45 ----- 10% (4) n/a
NH23 41 ----- 16% (4) n/a
NH24 99 ----- 26% (13) n/a
NH25 30 ----- 27% (8) n/a
NH26 46 ----- 28% (10) n/a
Mean (SD) 110 (58) 16% (8) 25% (13) 16% (8)
Median (range) 99 (24–255) 16% (3–31) 26% (0–52) 15% (0–30)
  1. a Admission prevalence swabs were not collected for nursing homes 20 through 26 due to small facility size and minimal resident turnover.
  2. b Estimated transmission risk was calculated as the absolute difference (MRSA point – admission prevalence) divided by the number of at risk patients per 100 admitted. For example, for NH3, transmission risk = (30% - 8%) / (100–8) = 24%.