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Bacterial Transfer To Fingertips During Sequential Surface Contacts With And Without Gloves

King, Marco‐Felipe; López‐García, Martín; Atedoghu, Kalanne P.; Zhang, Nan; Wilson, Amanda M.; Weterings, Martijn; Hiwar, Waseem; Dancer, Stephanie J.; Noakes, Catherine J.; Fletcher, Louise A.

Authors

Marco‐Felipe King

Martín López‐García

Kalanne P. Atedoghu

Nan Zhang

Amanda M. Wilson

Martijn Weterings

Waseem Hiwar

Catherine J. Noakes

Louise A. Fletcher



Abstract

Bacterial transmission from contaminated surfaces via hand contact plays a critical role in disease spread. However, the fomite‐to‐finger transfer efficiency of microorganisms during multiple sequential surface contacts with and without gloves has not been formerly investigated.

We measured the quantity of Escherichia coli on fingertips of participants after one‐to‐eight sequential contacts with inoculated plastic coupons with and without nitrile gloves. A Bayesian approach was used to develop a mechanistic model of pathogen accretion to examine finger loading as a function of the difference between E. coli on surfaces and fingers. We used the model to determine the coefficient of transfer efficiency (λ), and influence of swabbing efficiency and finger area.

Results showed λ for bare skin was higher (49%, 95%CI=32‐72%) than for gloved hands (30%, CI=17‐49%). Microbial load tended towards a dynamic equilibrium after four and six contacts for gloved hands and bare skin, respectively. Individual differences between volunteers’ hands had a negligible effect compared with use of gloves (p < 0.01). Gloves reduced loading by 4.7% (CI=‐12%‐21%) over bare skin contacts whilst 20% of participants accrued more microorganisms on gloved hands. This was due to poor fitting, which created a larger finger surface area than bare hands.

Journal Article Type Article
Acceptance Date Apr 14, 2020
Online Publication Date Apr 24, 2020
Publication Date 2020-09
Deposit Date May 15, 2020
Publicly Available Date Jun 10, 2020
Journal Indoor Air
Print ISSN 0905-6947
Electronic ISSN 1600-0668
Publisher Wiley
Peer Reviewed Peer Reviewed
Volume 30
Issue 5
Pages 993-1004
DOI https://doi.org/10.1111/ina.12682
Keywords Bacterial transmission; Bayesian model; Escherichia coli; hospital gloves; hospital surface contact; transfer efficiency
Public URL http://researchrepository.napier.ac.uk/Output/2663357

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Publisher Licence URL
http://creativecommons.org/licenses/by/4.0/

Copyright Statement
This is an open access article under the terms of the Creative Commons Attribution License.






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