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Mouthwashes, Oral Rinses May Inactivate Human Coronaviruses

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Certain oral antiseptics and mouthwashes may have the ability to inactivate human coronaviruses, according to a Penn State College of Medicine research study. The results indicate that some of these products might be useful for reducing the viral load, or amount of virus, in the mouth after infection and may help to reduce the spread of SARS-CoV-2, the coronavirus that causes COVID-19.

Craig Meyers, distinguished professor of microbiology and immunology and obstetrics and gynecology, led a group of physicians and scientists who tested several oral and nasopharyngeal rinses in a laboratory setting for their ability to inactivate human coronaviruses, which are similar in structure to SARS-CoV-2. The products evaluated include a 1% solution of baby shampoo, a neti pot, peroxide sore-mouth cleansers, and mouthwashes.

 

 Mouthwash

Credit: Claude TRUONG-NGOC / Wikimedia Commons

The researchers found that several of the nasal and oral rinses had a strong ability to neutralize human coronavirus, which suggests that these products may have the potential to reduce the amount of virus spread by people who are COVID-19-positive.

“While we wait for a vaccine to be developed, methods to reduce transmission are needed,” Meyers said. “The products we tested are readily available and often already part of people’s daily routines.”

Meyers and colleagues used a test to replicate the interaction of the virus in the nasal and oral cavities with the rinses and mouthwashes. Nasal and oral cavities are major points of entry and transmission for human coronaviruses. They treated solutions containing a strain of human coronavirus, which served as a readily available and genetically similar alternative for SARS-CoV-2, with the baby shampoo solutions, various peroxide antiseptic rinses and various brands of mouthwash. They allowed the solutions to interact with the virus for 30 seconds, one minute and two minutes, before diluting the solutions to prevent further virus inactivation. According to Meyers, the outer envelopes of the human coronavirus tested and SARS-CoV-2 are genetically similar so the research team hypothesizes that a similar amount of SARS-CoV-2 may be inactivated upon exposure to the solution.

To measure how much virus was inactivated, the researchers placed the diluted solutions in contact with cultured human cells. They counted how many cells remained alive after a few days of exposure to the viral solution and used that number to calculate the amount of human coronavirus that was inactivated as a result of exposure to the mouthwash or oral rinse that was tested. The results were published in the Journal of Medical Virology.

The 1% baby shampoo solution, which is often used by head and neck doctors to rinse the sinuses, inactivated greater than 99.9% of human coronavirus after a two-minute contact time. Several of the mouthwash and gargle products also were effective at inactivating the infectious virus. Many inactivated greater than 99.9% of virus after only 30 seconds of contact time and some inactivated 99.99% of the virus after 30 seconds.

According to Meyers, the results with mouthwashes are promising and add to the findings of a study showing that certain types of oral rinses could inactivate SARS-CoV-2 in similar experimental conditions. In addition to evaluating the solutions at longer contact times, they studied over-the-counter products and nasal rinses that were not evaluated in the other study. Meyers said the next step to expand upon these results is to design and conduct clinical trials that evaluate whether products like mouthwashes can effectively reduce viral load in COVID-19-positive patients.

“People who test positive for COVID-19 and return home to quarantine may possibly transmit the virus to those they live with,” said Meyers, a researcher at Penn State Cancer Institute. “Certain professions including dentists and other health care workers are at a constant risk of exposure. Clinical trials are needed to determine if these products can reduce the amount of virus COVID-positive patients or those with high-risk occupations may spread while talking, coughing or sneezing. Even if the use of these solutions could reduce transmission by 50%, it would have a major impact.”

Future studies may include a continued investigation of products that inactive human coronaviruses and what specific ingredients in the solutions tested inactivate the virus.

Janice Milici, Samina Alam, David Quillen, David Goldenberg and Rena Kass of Penn State College of Medicine and Richard Robison of Brigham Young University also contributed to this research.

The research was supported by funds from Penn State Huck Institutes for the Life Sciences. The researchers declare no conflict of interest.

Contacts and sources:
Barbara Schindo
Penn State

Publication: Lowering the transmission and spread of human coronavirus Craig Meyers PhD Richard Robison PhD Janice Milici BS Samina Alam PhD David Quillen MD David Goldenberg MD, FACS Rena Kass MD https://onlinelibrary.wiley.com/doi/10.1002/jmv.26514 http://dx.doi.org/10.1002/jmv.26514
 



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    Total 3 comments
    • PeacePlanet

      “..while we wait for a vaccine to be developed..” – Dr. Craig Meyers

      An absurd statement based on an incorrect premise that SARS-CoV-2 or any virus remains unchanged genetically.

      When the vaccine comes out, if it is even a true vaccine; it will only have whatever efficacy it has against the SARS-CoV-2 genotype for which it was developed. The current genotype will have mutated enough that the vaccine would then have little effect. A vaccine works best when it has specificity against the virus it was created to target.

      Same reason why every yearly flu vaccine is different from the preceding years’.

      Same reason why in forty years of fighting AIDS that there is still no vaccine; the virus has and continues to mutate faster than any vaccine can be developed against it, and thus has acquired adaptations of resiliency -in case the reader has wondered.

      Mouth washes and nasopharyngeal rinses are great ideas, along with basic nutritional, physical, emotional and spiritual health. I personally would not take any SARS-CoV-2 vaccine, regardless of who advocates for it, believing [in light of the preponderance of evidence] that this whole “pandemic” is but an exercise.

      Be vigilant.
      Get saved. 👉 John 3:16, John 14:6

      Cheers!

      • counselor john

        Hey Peaceplanet, you are correct in the mutation issues wand vaccines, it the mouthwashes that contain alcohol will kill any virus or bacteria quickly and mutations wouldn’t be relevant to an antiseptic. It would reduce viral load for a brief period of time but not really sure what the practical application would be on this since as soon as one left the house and went somewhere by the time they arrived their mouth would have a viral load again.

    • Jamais Vu

      What you need to do is take a Listerine enema. They measure the amount of Covid infection in communities by measuring the viral RNA in municipal sewage. Covid is coming out of your ass, fix it.

      Maybe even do a lung lavage with it. That will leave you feeling fresh and clean in the chest for sure. A nettie pot full of the Costco brand mouthwash kills the ‘Rona and helps with sinus infections.

      Substitute 70% Isopropanol (2-Propanol if ordering the HPLC grade from Sigma) or 70% EtOH will also work for these applications too, but are more flammable, so be careful about candle lit baths in these things.

      Above all, have a good time! You don’t have much left.

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