No abstract

An ecological risk assessment was conducted for sediments of the lower Willamette River near a wood-treatment (creosote) facility. Both surface and subsurface sediments near the facility are contaminated by polycyclic aromatic hydrocarbons (PAHs). Limited contamination of sediments by dioxins/furans, chlorinated phenols, and arsenic was also observed. Sediment bioassays based on amphipod (Hyuleh uztecu) mortality and Microtox@ (Photobacterium phosphoreum) bioluminescence showed toxicity within approximately 300 ft of the shoreline, with a highly toxic area (i.e., possible acute lethal effects in sedentary benthic species) near a dock used for creosote off-loading. The relatively low concentrations of contaminants measured in crayfish muscle tissue and the absence of serious lesions in livers of large-scale sucker collected near the site suggest that excess risk to mobile species from chronic contamination is low. Cursory observations indicate that acute toxic effects on crayfish may be associated with creosote seeps. There is no evidence of adverse biological effects throughout most of the main channel of the river. Evaluation of sediment chemistry data for PAHs relative to available sediment-quality criteria proposed by the U.S. Environmental Protection Agency supports this conclusion.

No abstract

A patient is described who presented with the acute onset of widely distributed necrotic papules mimicking pityriasis lichenoides et varioliformis acuta. A skin biopsy revealed granulomatous inflammation and spirochetes were demonstrated. Serologic testing confirmed infection with the Treponema pallidum. Syphilis is still a great imitator and its persistence as an infectious disease is reviewed.