Composition of Culturable Microorganisms in Dusts Collected from Sport Facilities in Finland during the COVID-19 Pandemic

Sport facilities represent extreme indoor environments due to intense cleaning and disinfection. The aim of this study was to describe the composition of the cultivated microbiota in dust samples collected in sport facilities during the COVID-19 pandemic. A dust sample is defined as the airborne dus...

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Bibliographic Details
Published in:	Pathogens (Basel) Vol. 12; no. 2; p. 339
Main Authors:	Andersson, Maria Aino, Vornanen-Winqvist, Camilla, Koivisto, Tuomas, Varga, András, Mikkola, Raimo, Kredics, László, Salonen, Heidi
Format:	Journal Article
Language:	English
Published:	Switzerland MDPI AG 01-02-2023 MDPI
Subjects:	20th century Air pollution airborne dust Aspergillus Bacteria Bacteria, Pathogenic Bacterial infections Colonies Composition Coronaviruses COVID-19 Disinfection Dust Dust control Environmental aspects Epidemics Finland Fungi Fungi, Pathogenic Health aspects Identification and classification Indoor air quality Indoor environments Microbial activity Microbiota Microorganisms Morphology Paecilomyces Pandemics Pollutants potential pathogens sport facilities Sports complexes Sports facilities Ventilation Finland Aspergillus Paecilomyces airborne dust potential pathogens sport facilities
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Summary:	Sport facilities represent extreme indoor environments due to intense cleaning and disinfection. The aim of this study was to describe the composition of the cultivated microbiota in dust samples collected in sport facilities during the COVID-19 pandemic. A dust sample is defined as the airborne dust sedimented on 0.02 m within 28 d. The results show that the microbial viable counts in samples of airborne dust ( = 9) collected from seven Finnish sport facilities during the pandemic contained a high proportion of pathogenic filamentous fungi and a low proportion of bacteria. The microbial viable counts were between 14 CFU and 189 CFU per dust sample. In seven samples from sport facilities, 20-85% of the microbial viable counts were fungi. Out of 123 fungal colonies, 47 colonies belonged to the potentially pathogenic sections of (Sections , , and ). Representatives of each section were identified as , , and Six colonies belonged to the genus In six samples of dust, a high proportion (50-100%) of the total fungal viable counts consisted of these potentially pathogenic fungi. A total of 70 isolates were considered less likely to be pathogenic, and were identified as section , and sp. In the rural ( = 2) and urban ( = 7) control dust samples, the microbial viable counts were >2000 CFU and between 44 CFU and 215 CFU, respectively, and consisted mainly of bacteria. The low proportion of bacteria and the high proportion of stress tolerant, potentially pathogenic fungi in the dust samples from sport facilities may reflect the influence of disinfection on microbial communities.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	2076-0817 2076-0817
DOI:	10.3390/pathogens12020339