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Don't forget to clean robotic support pets, study says

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Don't forget to clean robotic support pets, study says

image: Eight robot and toy animals used in stage one. From left: Paro, Miro, Pleo rb, Joy for All dog, Joy for All cat, Furby Connect, Perfect Petzzz dog, Handmade Hedgehog. view more 

Credit: Bradwell et al, 2020 (PLOS ONE, CC BY 4.0)

Robotic support pets used to reduce depression in older adults and people with dementia acquire bacteria over time, but a simple cleaning procedure can help them from spreading illnesses, according to a new study published August 26, 2020 in the open-access journal PLOS ONE by Hannah Bradwell of the University of Plymouth, UK and colleagues.

There is a wealth of research on the use of social robots, or companion robots, in care and long-term nursing homes. "Paro the robot seal" and other robotic animals have been linked to reductions in depression, agitation, loneliness, nursing staff stress, and medication use--especially relevant during this period of pandemic-related social isolation.

In the new study, researchers measured the microbial load found on the surface of eight different robot animals (Paro, Miro, Pleo rb, Joy for All dog, Joy for All cat, Furby Connect, Perfect Petzzz dog, and Handmade Hedgehog) after interaction with four care home residents, and again after cleaning by a researcher or care home staff member. The animals ranged in material from fur to soft plastic to solid plastic. The cleaning process involved spraying with anti-bacterial product, brushing any fur, and vigorous cleaning with anti-bacterial wipes.

Most of the devices gathered enough harmful microbes during 20 minutes of standard use to have a microbial load above the acceptable threshold of 2.5 CFU/cm2 (colony forming units per square centimetre). Only the Joy for All cat and the MiRo robot remained below this level when microbes were measured after a 48 hour incubation period; microbial loads on the other 6 robots ranged from 2.56 to 17.28 CFU/cm2. The post-cleaning microbial load, however, demonstrated that regardless of material type, previous microbial load, or who carried out the cleaning procedure, all robots could be brought to well below acceptable levels. 5 of the 8 robots had undetectable levels of microbes after cleaning and 48 hours of incubation, and the remaining 3 robots had only 0.04 to 0.08 CFU/cm2 after this protocol.

Hannah Bradwell, researcher at the Centre for Health Technology says: "Robot pets may be beneficial for older adults and people with dementia living in care homes, likely improving wellbeing and providing company. This benefit could be particularly relevant at present, in light of social isolation, however our study has shown the strong requirement for considerations around infection control for these devices."


Citation: Bradwell HL, Johnson CW, Lee J, Winnington R, Thill S, Jones RB (2020) Microbial contamination and efficacy of disinfection procedures of companion robots in care homes. PLoS ONE 15(8): e0237069.

Funding: The publication of this manuscript was kindly funded by the School of Clinical Sciences at Auckland University of Technology. H. Bradwell's PhD is being funded by the School of Nursing and Midwifery at the University of Plymouth, allowing HB to conduct this study as part of her degree. The robots used in this study were loaned from the School of Nursing and Midwifery and the Ehealth Productivity and Innovation in Cornwall and the Isle of Scilly (EPIC) project, which is part funded by the European Regional Development Fund (ERDF). All of the above were 'general funds' to fund study in this area of endeavour. There were no specific funds for this project and there is no commercial or other interest from the funders in the findings of this study.

Competing Interests: The authors have declared that no competing interests exist.

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