Resident cleanup activities, characteristics of flood-damaged homes and airborne microbial concentrations in New Orleans, Louisiana, October 2005

Environmental Research
Margaret A RiggsLynne E Pinkerton

Abstract

Flooding in the greater New Orleans (GNO) area after the hurricanes caused extensive mold growth in homes resulting in public health concerns. We conducted an environmental assessment of homes to determine the extent and type of microbial growth. We randomly selected 112 homes, stratified by water damage, and then visually assessed mold growth. Air samples from a subset of 20 homes were analyzed for culturable fungi, fungal spores, and markers of mold ((1-->3, 1-->6)-beta-D-glucans) and bacteria (endotoxin). Visible mold growth occurred in 49 (44%) homes; 18 (16%) homes had >50% mold coverage. Flood levels were >6 ft at 20 (19%), 3-6 ft at 20 (19%), and <3 ft at 28 (26%) homes out of 107; no flooding at 39 (36%) homes. The residents spent an average of 18 h (range: 1-84) doing heavy cleaning and of those, 22 (38%) reported using an N-95 or other respirator. Visible mold growth was significantly associated with flood height 3 ft and the predominant fungi indoors were Aspergillus and Penicillium species, which were in higher concentrations in homes with a flood level 3 ft. Geometric mean (GM) levels of endotoxin were as high as 40.2 EU/m(3), while GM glucan levels were as high as 3.5 microg/m(3) even when flooding was 3 ft. Based...Continue Reading

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