Covid virus can reside on some grocery items for days

Covid virus can reside on some ready-to-eat groceries, including fruits and bottled drinks, for days, UK experts have said, adding that there is no need for shoppers or handlers to take extra precautions when handling food other than washing hands regularly.

Scientists carried out tests for the Food Standards Agency (FSA), purposely smearing the virus on to packaging and food products, choosing the items that people might put in their mouth without cooking or washing. 

Their report says it should be noted that “foods and packaging considered as part of this study were artificially inoculated with Sars-Cov-2 and therefore are not a reflection of contamination levels found on these foods at retail, and lower levels of contamination will require less time to decline to undetectable levels”, BBC reported.

For most food products tested there was a “significant drop” in the levels of virus over the first 24 hours. But in some cases, traces survived for about a week, the University of Southampton team found. 

They picked foods often sold loose at grocery, deli or bakery counters, such as apples, peppers, cheese, ham, olives, crusty bread and croissants. The packaging tested included drink bottles, cartons and cans. 

The amount of virus they applied was designed to simulate how much might land on food if someone who was infected coughed or sneezed near it, for example, because Covid is spread by respiratory droplets. 

The virus appears to last longer on produce with uneven surfaces – broccoli and raspberries – than on smooth skinned ones such as apples (although some chilled fresh peppers had detectable virus a week later), the researchers say, adding that since apples contain natural chemicals in their skin, Covid virus get broken down within minutes or hours. 

Cheese and cold meat, with a high protein and fat content, appear to allow the virus to survive for days – possibly a week. The virus was found to survive for up to a week on plastic surfaces. For cartons, it could be several days. For aluminium cans, it is probably only hours, say the researchers. 

But they add that there is no need for shoppers to take extra precautions when handling food – other than washing your hands before preparing and eating it, and rinsing fresh produce to help to remove any contamination on the surface. 

Anthony Wilson, microbiological risk assessment team leader at the FSA, said: “In the early stages of the pandemic, we didn’t know much about how the virus would survive on different food surfaces and packaging, so the risk assessment was based on a worst-case assumption. 

“This research gives us additional insight into the stability of coronavirus on the surfaces of a variety of foods and confirms that assumptions we made in the early stages of the pandemic were appropriate, and that the probability that you can catch Covid via food is very low.”