How does the corona virus react to heating or freezing?

How does the corona virus react to heating or freezing?



Here and in our newsletter we regularly answer a question from our readers about the corona virus.

Do you also have medical questions about Covid-19 or would you like to know more precisely what economic, political or social effects the crisis will have for Germany and the world? Write to us at coronafragen@spiegel.de.

Reader Karlheinz Alger asks: How does the virus react to extreme heat or cold? He asks the question using the example of a bought leek with fresh viruses on it. You can now either cook it or freeze it in pieces. Are the viruses destroyed in both cases so that the leek can be consumed with ease?

Nina Weber, health editor at SPIEGEL, replied: First of all, this is a very theoretical example. After all, an infected person should have actually touched and put vegetables in the shop, with so many viruses on their hands that someone else could now catch the leek.

Sars-CoV-2 spreads via droplet infection. If someone coughs, sneezes, or comes very close to someone else speaking, the virus can be passed on. Lubricating infections are theoretically possible, but not the main transmission route.

The Federal Institute for Risk Assessment (BfR) writesthat there are currently no cases in which people have become infected through contaminated food. There are also no reports that other corona viruses can spread this way.

What about heat and cold?

The heat from cooking destroys the viruses.

However, freezing vegetables to fight viruses is not a safe strategy. Other corona viruses stay at minus 20 degrees for up to two years, writes the BfR. “Viruses can be stable longer in the cold,” says Jonas Schmidt-Chanasit from the Bernhard Nocht Institute for Tropical Medicine in Hamburg. “But they can be destroyed when thawed.” Repeated freezing and thawing could destroy the viruses – but who wants to eat the leek?

It is more important to pay attention to your own hand hygiene when cooking as well as in general.

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