The effect of climbing chalk powder on the infectivity of human coronavirus OC43.
Lett Appl Microbiol
; 72(6): 725-729, 2021 Jun.
Article
in English
| MEDLINE | ID: covidwho-1096912
ABSTRACT
There does not appear to be any studies in the published literature on the stability of SARS-CoV-2 in climbing chalk powder (magnesium carbonate and/or calcium carbonate), which has been hypothesized to pose a potential risk of fomite transmission of coronavirus disease 2019 (COVID-19) within climbing gyms. The aim of this study was to determine the infectivity of a model human coronavirus HCoV-OC43 in the presence of climbing chalk powder on a dry plastic surface. The stability of HCoV-OC43 on a plastic surface dusted with climbing chalk powders (magnesium carbonate, calcium carbonate or a blended chalk) was determined by titration on BHK-21 fibroblast cells. No chalk and no virus controls were included. HCoV-OC43 was stable on the plastic surface for 48 h. The stability of HCoV-OC43 was significantly (P ≤ 0·05) reduced in the presence of magnesium carbonate, calcium carbonate and the chalk blend; the infectivity was reduced by ≥2·29 log10 50% tissue culture infective dose (TCID50 ) immediately upon on contact and by ≥2·46 log10 TCID50 within 1 h of contact. These findings suggest that the infectivity of coronaviruses is reduced by climbing chalk, limiting the risk of potential fomite transmission.
Keywords
Full text:
Available
Collection:
International databases
Database:
MEDLINE
Main subject:
Coronavirus OC43, Human
Type of study:
Experimental Studies
/
Prognostic study
Limits:
Animals
Language:
English
Journal:
Lett Appl Microbiol
Journal subject:
Microbiology
Year:
2021
Document Type:
Article
Affiliation country:
Lam.13466
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