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. 2003 Apr;69(4):2166-71.
doi: 10.1128/AEM.69.4.2166-2171.2003.

Survival of Yersinia pestis on environmental surfaces

Affiliations

Survival of Yersinia pestis on environmental surfaces

Laura J Rose et al. Appl Environ Microbiol. 2003 Apr.

Abstract

The survival of two strains of Yersinia pestis (avirulent A1122 and virulent Harbin) on the surfaces of four materials was investigated. Viability was evaluated with epifluorescence microscopy by using the metabolic stain cyanoditolyl tetrazolium chloride and plate counts. Small numbers of cells suspended in phosphate buffer survived 2 to 4 h after visible drying on stainless steel, polyethylene, or glass and beyond 48 h on paper. Cells suspended in brain heart infusion broth (BHI) persisted more than 72 h on stainless steel, polyethylene, and glass. Small numbers of cells suspended in BHI were still viable at 120 h on paper. These data suggest that Y. pestis maintains viability for extended periods (last measured at 5 days) under controlled conditions.

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Figures

FIG. 1.
FIG. 1.
Survival of Y. pestis A1122 on stainless steel over time. y axis numbers represent log10 cells as counted under epifluorescence microscopy (CTC- and DAPI-stained cells, mean of three to nine coupons) or in CFU (mean of 3 to 18 coupons).
FIG. 2.
FIG. 2.
Paper coupon without bacteria.
FIG. 3.
FIG. 3.
Y. pestis Harbin dried on paper coupon for 5 days at 55% RH.

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