Kelly A. Reynolds

Introduction

Kelly A. Reynolds is an American environmental microbiologist and infectious disease researcher. She is Professor and Chair of the Department of Community, Environment and Policy at the Mel and Enid Zuckerman College of Public Health, University of Arizona, and Director of the university's Environment, Exposure Science and Risk Assessment Center.

Reynolds is not a psychologist, and no reasonable reading of her record supports listing her as one. Her doctorate is in environmental microbiology, her publications appear in environmental science, occupational health and infection-control journals, and she holds no appointment in any psychology department. Earlier versions of this entry carried a heading claiming her major contributions to psychology and then filled it entirely with material about pathogen transmission in water, air and on surfaces, which is an accurate description of her research and an admission that the framing was wrong.

She is retained here for a defensible reason. A substantial part of Reynolds's programme depends on human behaviour and on the measurement of it: whether people wash their hands, whether they report accurately that they did, how often hands touch faces and shared surfaces, and whether making hygiene products easier to reach changes what people actually do. Those are behavioural questions studied with behavioural methods, and her work on the gap between self-reported and observed hygiene compliance is directly relevant to health psychology. What follows describes what she has actually done, with the disciplinary boundary marked rather than blurred.

Early Life and Education

Reynolds's birth date, birthplace and family background are not documented in any reliable source. An earlier version of this page asserted that she was born and raised in the United States and developed an interest in science and public health from an early age; that account has no traceable origin and is not repeated here.

Her documented education begins at the University of Arizona, where she earned a Bachelor of Science in Microbiology from the College of Arts and Sciences in 1989. She then moved to the University of South Florida for a Master of Science in Public Health, completed in 1992 in the Department of Environmental and Occupational Health, with a thesis on methods for recovering and quantifying bacteriophage from marine waters and sediment, supervised by the water microbiologist Joan B. Rose.

She returned to the University of Arizona for doctoral work and received her PhD in 1995 through the College of Agriculture and Life Sciences, in the Department of Soil and Water Science, with environmental microbiology as her major field. Her dissertation, "Detection of Enteroviruses in Marine Waters Using RT-PCR," was supervised by Charles P. Gerba and Ian L. Pepper, two of the most prominent figures in environmental microbiology. This is a correction of record: her doctorate is not in environmental health sciences, as previously stated on this page, and the distinction between a soil and water science doctorate and a public health doctorate is not cosmetic.

She has said of that training that environmental science taught her the value of a strong work ethic and of enjoying the work, and that the discipline's multidisciplinary character underpins the One Health approach she applies to environmental and public health problems.

Academic and Professional Career

Reynolds's entire career has been built at the University of Arizona, where she first worked as a research technician in the Department of Microbiology and Immunology from 1987 to 1989, before her bachelor's degree was finished. Between 1989 and 1991 she was a research assistant at the University of South Florida's College of Public Health, then returned to Arizona as a research fellow in soil and water science from 1992 to 1994 and as a postdoctoral fellow and teaching assistant in 1995.

From 1995 to 2006 she was an assistant research scientist and appointed faculty member in the Department of Soil, Water and Environmental Science, based at the Environmental Research Laboratory. In 2006 she moved into the Zuckerman College of Public Health as Associate Professor in the Department of Community, Environment and Policy, holding a concurrent joint appointment in soil, water and environmental science. She was tenured in 2012, promoted to full Professor in 2018, and appointed Chair of her department the same year. She served as Interim Associate Dean for Research at the college from September 2021 to July 2022, and directs the Environment, Exposure Science and Risk Assessment Center.

By her institution's count she has more than thirty years of experience and has published over four hundred journal articles, book chapters and professional reports, with research funding across numerous projects as principal investigator. Her recognitions include the Water Quality Association's Honorary Membership Award, the William B. Fritzsche Memorial Top 50 International Award, selection of one of her papers among the fifty most outstanding published in ACS Omega over a five-year period, and finalist standing in the 2022 NIOSH Science and Service awards for research-to-practice intervention work. Her research has been covered by outlets including the New York Times and the Wall Street Journal.

Major Contributions to Psychology

Reynolds has made no contribution to psychological theory. The honest version of this section identifies the points at which her research depends on, and informs, the study of behaviour.

Measuring the Gap Between Reported and Observed Behaviour

Her 2018 study comparing perceived and observed hand hygiene compliance among healthcare workers in regions endemic for MERS coronavirus is her most directly psychological work. Using a cross-sectional design, it set workers' questionnaire reports of their own hand hygiene against direct observation scored on a sixteen-item checklist drawn from established guidelines. The discrepancy between what people say they do and what they can be seen doing is a core problem of self-report validity, and it bears on any health-behaviour research that relies on questionnaires.

She has pursued the same methodological concern elsewhere, notably in a 2018 paper validating questionnaire estimates of how much water swimmers swallow against a chemical tracer measured in swimmers' urine. Surveys are cheaper than tracers, and her question was whether they can be trusted.

Behaviour as Input to Risk Models

Reynolds is a practitioner of quantitative microbial risk assessment, which converts pathogen concentrations into estimated probabilities of infection. The models are only as good as their behavioural parameters: hand-to-face contact rates, frequency of touching shared surfaces, ingestion volumes, compliance with cleaning protocols. Her work developing and validating such models, including a stochastic discrete-event model predicting virus concentration on nurses' hands and modelling of the surface disinfection needed to hit specified risk-reduction targets, effectively formalises behavioural frequencies as quantities. She has also worked on the statistical treatment of data falling below detection limits, an acknowledgement that these models carry substantial uncertainty.

Environmental Design Over Persuasion

The intervention studies for which Reynolds is best known outside her field, on virus spread in office buildings, test a mechanism closer to choice architecture than to health education. Employees were given hand sanitiser, tissues and disinfecting wipes at their desks, with sanitiser stocked in shared areas and instructional signage placed at high-traffic points. Her stated interpretation is that simply making the products readily available increases their use. She has argued in the same vein for flexible sick-leave policy so that ill employees stay home, staggered schedules, and positive signage that signals an organisational culture valuing hygiene, all of which are structural and normative levers rather than appeals to individual knowledge.

Risk Communication

Reynolds has been explicit that hazard identification is not sufficient on its own. Her formulation is that scientists can keep improving methods to identify and control hazards, but that the information only goes so far if the public does not actively participate in reducing exposure. Acting on this, she worked with the Tucson Fire Department to build a SARS-CoV-2 exposure prevention protocol, checklist and ten-minute training video for emergency medical personnel, which drew more than eighteen thousand views within three weeks. Her media-facing findings, such as the claim that one sick employee can contaminate more than half of office surfaces within four hours and that the refrigerator door handle is the most contaminated site in a typical office, are risk-communication artefacts as much as research results.

Major Publications

Reynolds publishes journal articles, chapters and technical reports rather than monographs. The two books previously listed on this page, on environmental health and pathogen transmission and on advances in environmental monitoring, do not exist in any catalogue and have been removed. Representative peer-reviewed work includes:

"Detection of Enteroviruses in Marine Waters Using RT-PCR" (doctoral dissertation, University of Arizona, 1995).
"The healthy workplace project: Reduced viral exposure in an office setting," Archives of Environmental and Occupational Health, with Paloma I. Beamer, Kevin R. Plotkin, Laura Y. Sifuentes, David W. Koenig and Charles P. Gerba.
"Comparison of Perceived and Observed Hand Hygiene Compliance in Healthcare Workers in MERS-CoV Endemic Regions" (2018).
"Methods for Handling Left-Censored Data in Quantitative Microbial Risk Assessment" (2018).
"Modeling Surface Disinfection Needs To Meet Microbial Risk Reduction Targets" (2018).
"Validation of Questionnaire Methods to Quantify Recreational Water Ingestion" (2018).
"Validation of a Stochastic Discrete Event Model Predicting Virus Concentration on Nurse Hands" (2019).
"Impact of a hygiene intervention on virus spread in an office building" (2019).
"Seasonal Variation of Water Quality in Unregulated Domestic Wells" (2019).

Impact and Legacy

Reynolds's practical influence has been considerable. Her office-hygiene work shaped commercial and institutional cleaning practice, her drinking-water research informs guidance for households on private wells and point-of-use filtration, and her infection-control collaborations with fire departments and outpatient clinics are cited as models of translating research into protocol.

That influence is also where the criticism lands, and it is substantial. Two problems recur. The first is the provenance of her headline numbers. The office study that produced the widely repeated finding of an eighty per cent reduction in infection probability included a co-author employed by Kimberly-Clark's corporate research division, and the figure has since been used extensively in that company's marketing of its Healthy Workplace Project. The reduction was not a measured illness rate; it was derived from mathematical risk modelling, a distinction that the promotional use of the number routinely loses. Her Honorary Membership Award comes from the Water Quality Association, a trade body for the water-treatment industry. None of this establishes misconduct, but a research programme that demonstrates the value of hygiene products and is partly conducted with the firms that sell them carries an obvious structural conflict of interest.

The second and sharper criticism is that the emphasis on contaminated surfaces was overstated. Emanuel Goldman argued in The Lancet Infectious Diseases in 2020, and again in Applied and Environmental Microbiology in 2021, that laboratory studies of viral survival on surfaces used inoculum concentrations orders of magnitude larger than anything encountered in ordinary settings, that detection of viral RNA is not a valid surrogate for infectious virus, and that attempts to culture infectious virus from real hospital surfaces almost always fail. Public health guidance moved his way: by 2021 the United States Centers for Disease Control and Prevention stated that surface transmission is not the main route by which SARS-CoV-2 spreads and that the risk is low. Critics labelled the resulting deep-cleaning regimes hygiene theatre, and argued that resources spent on surfaces were diverted from ventilation, where the evidence was stronger.

The defence is reasonably strong on the specifics. Goldman's argument was about respiratory viruses, and he conceded that many bacterial pathogens and respiratory syncytial virus do transmit from surfaces. Much of Reynolds's programme concerns norovirus, enteric viruses, methicillin-resistant Staphylococcus aureus and healthcare-associated infection, where fomite and hand transmission are not seriously disputed. Her interventions bundle hand hygiene and tissues with surface disinfection, and hand hygiene has independent support. She has publicly acknowledged the uncertainty rather than defended a position, stating during the pandemic that questions about how far the virus spreads and how long it survives on surfaces were still being researched, and she recommended in the same interview that buildings increase ventilation rates and fresh-air exchange and flush stagnant water lines against Legionella. Her own methodological work on censored data and on model validation shows a researcher aware that her estimates are estimates. The fair conclusion is that her science is legitimate within its domain and that the promotional afterlife of one of her numbers has been less careful than the paper that produced it.