Roger David Lewis

Roger David Lewis
Saint Louis University | SLU · Department of Environmental & Occupational Health

Environmental Health

About

49
Publications
4,995
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463
Citations

Publications

Publications (49)
Article
The purpose of this study was to examine the possible ecological association between aggregate blood lead levels (BLL) and rates of child maltreatment. To this end, we employed an ecologic study design, analyzing results from 59,645 child BLL tests between the years 1996 and 2007, and 6,640 substantiated maltreatment investigations from 2006 to 201...
Article
Background In a previous study, we found that rates of antibiotic residues in goat carcasses in Missouri were three times the published national average, warranting further research in this area. Methods We conducted a cross-sectional survey of goat veterinarians to determine attitudes and practices regarding antibiotics, recruiting 725 veterinari...
Article
Full-text available
Use of low dose, prophylactic antibiotics contributes to the emergence of antibiotic resistant bacteria. In one study, goat meat in Missouri was found to have a higher percentage of antibiotic residues at slaughter than the national average, so we attempted to identify factors related to goat production that may contribute to this issue. Using the...
Article
In late 2010, a subsurface smoldering event was detected in the Bridgeton Sanitary Landfill in St. Louis County, Missouri. This was followed by complaints from nearby residents of foul odors emanating from the landfill. In 2016 a health survey was conducted of residents near the landfill and, as a comparison, other regions of St. Louis County. The...
Article
Conventional wisdom has been that hard, resilient surfaces resuspend less particles than carpeted surfaces, however, exceptions to this have been demonstrated and uncertainty remains about the factors that lead to this resuspension, notably, the effect of vacuum cleaning on either increasing or reducing resuspension from flooring. The purpose of th...
Article
Full-text available
Context An increasing body of research has linked the geographic distribution of lead with various indicators of criminal and antisocial behavior. Objective The current study, using data from an ongoing project related to lead exposure in St. Louis City, MO, analyzed the association between aggregate blood lead levels and specific indicators viole...
Data
Crude rates of violent crime are presented by quantile, with darker shades indicating higher crime rates and lighter shades indicating lower crime rates. Rates are per 1,000 people. (DOCX)
Data
Associations between lead exposure and violent crime types with interaction terms, St. Louis City, MO. (DOCX)
Data
Crude standardized incidence ratios (SIR) are presented by quantile, with darker shades indicating higher SIRs and lighter shades indicating lower SIRs. (DOCX)
Data
Adjusted standardized incidence ratios (SIRs) presented for each crime type. (DOCX)
Article
ABSTRACT Steam vapor has been shown to reduce viable mold spores in carpet, but the minimal effective temperature and contact time has not been established. This study evaluated the effectiveness of steam vapor in reducing the number of viable mold spores in carpet as a function of temperature and contact time. Seventy carpet samples were inoculate...
Article
ABSTRACT This study evaluated the growth and removal of fungi on wetted carpet using newly designed technologies that rely on physical principles of steam, heat and fluid flow. Sixty samples of carpet were embedded with heat-treated house dust, followed by embedding, wearing with a hexapod, and wetting. Samples were inoculated using a liquid suspen...
Article
Lack of access to potable drinking water due to contamination from harmful metals is one of the most pressing public health issues globally. In areas close to mining and smelting operations, significant contamination from arsenic and other harmful metals can compound contamination from harmful microorganisms in drinking water. In response to this d...
Article
ABSTRACT Carpet is known to be a reservoir for biological contaminants, such as dust mites, dust mite allergen, and mold, if it is not kept clean. The accumulation of these contaminants in carpet might trigger allergies or asthma symptoms in both children and adults. The purpose of this study is to compare methods for removal of dust mites, dust mi...
Article
Background: Breastfeeding and air pollution are both important factors for respiratory symptoms and asthma in children. Few studies have examined possible interaction between them on respiratory outcomes. Methods: We studied 31,049 Chinese children, ages 2-14 years old, from 25 elementary schools and 50 kindergartens in the Seven Northeastern Ci...
Conference Paper
Background: Evidence indicates that exposure to ambient air pollution and breastfeeding are both important factors for respiratory symptoms and illness in children. However, few studies have examined the potential interaction of air pollution and breastfeeding on respiratory health. Objectives: Evaluate whether breastfeeding modifies the effects of...
Article
Government guidelines have traditionally recommended the use of wet mopping, sponging, or vacuuming for removal of lead-contaminated dust from hard surfaces in homes. The emergence of new technologies, such as the electrostatic dry cloth and wet disposable clothes used on mopheads, for removal of dust provides an opportunity to evaluate their abili...
Article
A need exists to develop realistic surfaces, with differing degrees of surface roughness, to standardize methods for sampling and cleaning of environmental contaminants. This study reports on development and characterization of a novel means to create reproducible wood surfaces that are approximately 7×10 cm2 and have differing degree of surface ro...
Article
Understanding the relationship among allergies, asthma, and indoor air allergen triggers increasingly require use of standardized and evidence based exposure assessment methods. Exposure assessment for common indoor allergens, however, is often limited by use of surface in place of air sampling for a variety of reasons. Chief among them is that man...
Article
With a view to producing carpets that could be used to determine the ease of particulate aerosolisation during domestic activity, we measured the cross-sectional distribution of dust-mite allergen, Der p 1, produced using American Society for Testing and Materials method (ASTM F608–89) for embedding house dust in carpets with that produced by sever...
Article
Full-text available
Exposure to cat allergen (Fel d 1) has been associated with immune responses and exacerbation of asthma. As such allergen can accumulate in carpet, we sought to determine the influence of carpet pile conformation (loop vs. cut) and degree of wear on the levels of Fel d 1 present before and after different cleaning processes. Tufted wool carpets of...
Article
Government guidelines have widely recommended trisodium phosphate (TSP) or "lead-specific" cleaning detergents for removal of lead-contaminated dust (LCD) from hard surfaces, such as floors and window areas. The purpose of this study was to determine if low-phosphate, non-lead-specific cleaners could be used to efficiently remove LCD from 3 types o...
Article
Carpet is a major sink for house dust mite allergen. Vacuum extraction methods have been shown to reduce concentrations of such allergen in dust, but the influence of carpet construction and cleaning parameters on the efficiency of extraction is poorly understood. The objective of this study was to determine the effect of construction, degree of we...
Article
Full-text available
Dust wipe samples collected in the field were tested by nondestructive X-ray fluorescence (XRF) followed by laboratory analysis with flame atomic absorption spectrophotometry (FAAS). Data were analyzed for precision and accuracy of measurement. Replicate samples with the XRF show high precision with an intraclass correlation coefficient (ICC) of 0....
Article
Full-text available
An environmental-justice (equity) grant program was used to make accessible an existing lead-training program to minority persons and residents of low-income communities. The purpose of the program was to enhance the knowledge base within the communities concerning lead hazards and intervention strategies and expand possibilities for employment in...
Article
Although the importance of carpeting on airborne levels of cat allergen (Fel d 1) has been demonstrated, no studies have been performed to determine specific properties of carpet that may affect its retention and removal. This study characterizes factors that affect the retention of cat allergen on tufted carpets. The experiments were designed to t...
Article
Artificial soiling of carpeted or other floor surfaces has several important applications in human exposure assessment and textile research including evaluation of textile properties, sampling devices, and cleaning regimens. A method was developed and validated to deposit uniform and reproducible known quantities of house dust, allergens, and leade...
Article
Childhood exposure to lead has been demonstrated to result in health effects and lead-contaminated household dust is a primary exposure source. There is a need to establish reliable methods for sampling surfaces to determine levels of lead contamination. Three vacuums (HVS3, GS80, and MVM) and one wipe method were evaluated for the collection of ho...
Article
To establish a more accurate relationship between dust mite allergen on surfaces such as bedding with respiratory uptake, an exposure method is needed which correlates exposure of allergen on surfaces with respiratory dose. Assess if aerodynamically large allergen particles (> 10 microm), similar in nature to dust mite allergen, is inhaled into the...
Article
This study investigated arthropod and nonarthropod sources of reported bites and itching in a word processing division of a St. Louis, Mo., municipal department. Bird and rodent mites were suspected as causes of the bites because of the large population of pigeons around window ledges on some floors and the sighting of mice in the office. No mites...
Article
Carpeting is one of the most common and perhaps the most important reservoir of aeroallergens and other components of dust found in residential or commercial settings. This research evaluated factors that affect the retention of dust mite allergens on different types of tufted carpet commonly found in homes and offices. Twenty-six types of carpet w...
Article
Full-text available
Hand-held vacuum cleaners are commonly adapted for collection of allergens in settled dust; however, the collection efficiencies for most of these devices have not been investigated. We evaluated and compared the collection characteristics of two vacuum surface samplers: the ReadiVac (6735), a hand-held vacuum cleaner with a cloth filter bonnet; an...
Article
Allergenic diseases triggered by aeroallergens extract a health cost in quality of life and in economic impact. People generally spend 90% to 95% of their time indoors, so understanding the environmental factors that affect the presence of aeroallergens indoors are important in understanding health impact and potential intervention methods. Describ...
Article
Full-text available
The purpose of this paper is to describe the state of the science in retention and removal of house dust contaminants in carpet. A brief review of the literature on carpet contaminants, its health concerns, sources and pathways, mechanics of soiling, and cleaning will be presented. The importance of lead, dust mite and cat allergen, both as serious...

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Projects

Project (1)
Project
This effort was composed of a series of projects investigating exposure, health outcomes and mitigation potentials from a variety of different environments. This included residential housing and daycares in the St. Louis, MO metropolitan area, the lead belt mining area, Herculaneum smelter and Jasper County of Missouri, to La Oroya, Peru.