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By Sukalyan Sengupta and Tabish Nawaz

Humans have known since ancient times that silver kills or stops the growth of many microorganisms. Hippocrates, the father of medicine, is said to have used silver preparations for treating ulcers and healing wounds. Until the introduction of antibiotics in the 1940s, colloidal silver (tiny particles suspended in a liquid) was a mainstay for treating burns, infected wounds and ulcers. Silver is still used today in wound dressings, in creams and as a coating on medical devices.

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The U.S. Court of Appeals for the Ninth Circuit concluded Tuesday that the U.S. Environmental Protection Agency (EPA) unlawfully allowed a novel antimicrobial pesticide product "NSPW-L30SS" (previously "Nanosilva"), made with silver nanoparticles, for use in an unknown number of textiles and plastics.

The court voided EPA's approval, preventing the product from entering the marketplace and the environment. The opinion is the first of its kind to address EPA's responsibilities in issuing conditional registrations of new pesticides such as this one.

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