The News Herald (Willoughby, OH)

Does copper kill a cold virus?

- Keith Roach To Your Good Health — J. Contact Dr. Roach at ToYourGood­Health@med. cornell.edu.

What do you know about copper killing the cold virus?

I’m of the opinion that if it sounds too good to be true, it probably is. Yet, there is a copper product on the market that says it kills the cold virus on contact. Many people have claimed it is effective. Are all these reviews fake? If preventing a cold was this easy, wouldn’t everyone know about it?

Copper does have antimicrob­ial properties. Bacteria will die on contact with pure metallic copper. The amount of time needed ranges from a few minutes for some Staphyloco­ccal species to 5-15 days for the bacteria that causes tuberculos­is. Viruses, which are somewhere between alive and not alive, being only able to replicate within a cell, can be destroyed by copper as well. For the influenza virus, 99.99% can be destroyed by keeping it in contact with metallic copper for six hours.

Unfortunat­ely, cold viruses and flu viruses can be inhaled and then taken up by cells, allowing them to replicate and further infect a person. There is simply no way a piece of copper can prevent infection by viruses when rubbed on the nose. That’s why there are no clinical trials showing the copper to be effective: It isn’t.

I don’t think most of the people responding are fake. The power of believing that something is working is incredible. I suspect many of the people writing testimonia­ls are also not being exposed often to cold viruses.

There is no way to prevent a cold with 100% certainty. Handwashin­g and avoiding sick people remain the best treatments we have.

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