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Effects of natural attenuation only (e.g., no active decontamination) on persistence of liquid HD spike on indoor airport surfaces; 1 µl droplet (containing 790 µg HD) (Love et al. 2009; Love et al. in review). The percent of HD remaining is depicted relative to the amount of HD initially applied to the surface. (a) Short-term persistence (within 1 week). (b) Longer-term persistence (within 1 year).
