AUGUST 14, 2020
There have been suggestions that the new domestic COVID-19 cases in New Zealand were the result of samples of the SARS-CoV-2 virus surviving on food packaging.
Dr Julian Tang, Honorary Associate Professor in Respiratory Sciences, University of Leicester, said:
“Laboratory-based studies on the survival of the SARS-CoV-2 virus certainly show that the virus can survive for hours to days on some packaging materials – mostly cardboard and various forms of plastic:
https://www.journalofhospitalinfection.com/article/S0195-6701(20)30046-3/fulltext
“The transmission risk being based on the usual assumption that workers in the food packaging plants will touch these surfaces then self-inoculate via their nose, mouth, eyes, though this has actually not been shown definitively for SARS-CoV-2 yet.
“The problem with these ‘ideal’ studies is that the environmental conditions will change rapidly in the real-life environments that such food packages pass through, which may reduce the virus survival further compare to these lab-based ‘constant’ exposure conditions.
“This surface packaging transmission source/route is also difficult to be definitive about because there is a need to exclude any recent exposure from any other source (e.g. asymptomatic social contacts or household cases via conversational aerosols) to be sure that any food packaging-related exposure/infection is the true cause of their infections. Nowadays, this will need additional careful viral sequencing and analysis to check this – which may show differences between the imported SARS-CoV-2 on the packaging versus the locally circulating SARS-CoV-2. Such studies may be ongoing in New Zealand and China to determine this – but see the caveat below.
“This transmission route from contaminated surfaces to fingers to mouth/nose/eyes – the fomite/contact transmission route, is not considered the main route of transmission for SARS-CoV-2 now: https://www.cdc.gov/coronavirus/2019-ncov/prevent-getting-sick/how-covid-spreads.html
“And any clusters of COVID-19 cases in such food warehouses need to be careful to exclude any transmission between infected individuals via other transmission routes – like person-to-person aerosols, which may also transmit the same imported virus between warehouse workers. This could confound such viral sequencing/analysis studies if the food packaging source is assumed to be the only source that could have given rise to COVID-19 cases amongst these workers.”
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A United States Postal Service (USPS) mail carrier walks through heavy rain as Tropical Storm Fay sweeps across the heavily populated northeastern United States in Jersey City, New Jersey, U.S., July 10, 2020. © REUTERS/Mike Segar/File Photo