An outbreak of COVID-19 pneumonia was detected in Wuhan, China and reported to the World Health Organisation on 31 December 2019 and characterised as a pandemic on 11 March 2020. In the absence of either a treatment or a vaccine, Government advice on social distancing, concerns about disruption that would result if the widespread closure of borders was to prove necessary and anticipation and implementation of stay-at-home protocols resulted in rapid and substantial changes in patterns of consumer demand.
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