Antimicrobials in the Time of Coronavirus

Antimicrobials are often unnecessary and can do more harm than good. In an effort to protect our health from microbes, antimicrobial chemicals are added to consumer products and building materials such as face masks, clothing, cutting boards, door handles, and countertops. They may be marketed as antimicrobial, antiviral, antibacterial, or anti-odor. However, for most of these uses, their effectiveness to reduce illness has not been demonstrated. The widespread use of antimicrobials can cause harm to humans and beneficial microorganisms, and contribute to antibiotic resistance. They can end up in places where they don’t belong — like water, food, and human breast milk.

Questions to ask about health and efficacy claims.
• Is the product effective? What research demonstrates that it reduces the transmission of viruses or bacteria? How long does its effectiveness last?
• Is the product safe throughout its lifecycle (production, use, and disposal)?
• Is there adequate health data? Products claiming a health benefit must be registered with the US government for specific uses, which requires a demonstration of efficacy and safety. Ask for the Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA) registration.
• What about other claims? The US government allows marketing claims, such as for odor reduction, aesthetic benefits, or product preservation to be made with less verification.
• Are there alternatives that are effective and safe? Harmful chemicals can often be replaced by safer chemicals, materials, or designs.

Antimicrobial Chemicals to Avoid
Note that antimicrobial chemicals might not be disclosed on the finished product. Ask about the additives below and avoid their use.

Chlorinated antimicrobials (such as triclosan and triclocarban)
Chlorinated antimicrobials are persistent in the environment, can disrupt hormone functioning and cause adverse reproductive and developmental effects. In 2016, the FDA determined that 19 antimicrobials, including triclosan and triclocarban, should not be used in consumer soaps and body wash products due to their lack of proven benefit and potential for health harm. However, they continue to be used in numerous other products where their value and safety have not been demonstrated.

Quaternary ammonium compounds (quats or QACs)
Quats are persistent and can contribute to health problems such as asthma, allergen sensitivity, skin irritation, and adverse respiratory, nervous system, immunological, reproductive and developmental effects. They are used in consumer products and building materials as well as for cleaning and disinfection.

Nanometal antimicrobials (such as nanosilver)
Nanometals, due to their very small size, have unique physical and chemical properties that can enable them to enter and harm cells and tissues. Also, they may contribute to microbial resistance. Some hospital systems have already banned nanosilver, along with a number of other antimicrobials, due to their lack of benefit in preventing infection and potential health harm.

Go to for this factsheet including references and also resources on safer cleaning and disinfection.

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