Health DG sheds light on concerns surrounding nano mist

PUTRAJAYA: The use of nano mist does not replace the requirement for standard surface cleaning for disinfection against Covid-19, says Health director-general Tan Sri Dr Noor Hisham Abdullah.

“Nano mist has gained public attention in its use as a disinfecting tool to prevent transmission of Covid-19, with some members of the public believing that it could kill the SARS-CoV-2 virus in the air and on surfaces.

“However, the effectiveness of this device is dependent on its dispersion ability, the disinfectant type used and its concentration, as well as the contact time between disinfectant and surface,” he said.

Nano mist spray delivers nano-sized particles and is widely used for various purposes, including cosmetics, perfume, domestic and industrial use.

It is available in many forms, ranging from spray gun and handheld spray for personal use and larger sizes for industrial use.

Dr Noor Hisham said currently, several surface disinfectants had been identified to be effective against SARS-CoV-2 such as alcohol 70% to 90%, hydrogen peroxide, thymol, quaternary ammonia and chlorine-based solution.

The list of recommended surface disinfectants against SARS-CoV-2 is available on the US Environmental Protection Agency website, which is an international reference for disinfectants.

The Star recently reported that experts had raised concerns over how these gadgets were being used.

While some shops are using them to spray sanitiser on objects to prevent Covid-19 infection, many are also using them on visitors, customers and even themselves.

Universiti Sains Malaysia virologist Dr Kumitaa Theva Das said while the mist or dry fog that these guns emitted was good for covering large surface areas, it was a bad idea to aim it at people.

“If not used properly, the chemicals in the spray can potentially be hazardous,” she said.

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