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“There is a long history of investigations concluding that, if used properly, UVGI can be safe and highly effective in disinfecting the air, thereby preventing transmission of a variety of airborne infections. Despite this long history, many infection control professionals are not familiar with the history of UVGI and how it has, and has not, been used safely and effectively.” (Link)
As we’ve mentioned before, UVC light has been used since the 1800s to kill bacteria and other unwanted organisms. Are you familiar with the amazing story of UVC disinfection? Read on for some insight into an extraordinary natural phenomenon that saves countless people from infections every year, and is set to help the world cope with a covid virus that’s unlikely to go away.
What is UVGI?
Ultraviolet germicidal irradiation (UVGI) uses short wave UV light to kill or inactivate viruses, bacteria and more by disrupting their DNA so badly they can’t reproduce. It’s used to purify air, drinking and waste water, food and more, and is often built into filtration systems. UVGI has been used for disinfection since the mid-1900s, mostly to sanitise healthcare settings and workplaces where sterility is vital. But the germ of the idea first took root in 1845, when scientists first realised that microorganisms are vulnerable to light.
Downes and Blunts’ key UV discoveries
In 1877 two scientists called Downes and Blunt observed how exposing test tubes containing Pasteur’s solution to sunlight stopped microorganisms inside the tube growing. If they left the test tubes in the sun for long enough, they remained free of bacteria for several months. Some say this was ‘one of the most influential discoveries in all of photobiology.’ The men went on to prove the ability of sunlight to neutralise bacteria as long as the intensity, duration, and wavelength of the light was right. They found the shorter wavelengths of the solar spectrum were the most powerful, and the story of ultraviolet germicidal irradiation began.
Early UVC germicidal lamps
UVC germicidal lamps have been used since the late 1800s to kill the micro-organisms that cause indoor air quality issues, things like bacteria, mould, yeast and viruses. Niels Ryberg Finsen became the first to use UV to treat disease. He was given a Nobel Prize for Medicine in 1903 for inventing the Finsen curative lamp, which was widely used right up until the 1960s.
In the 1930s, Westinghouse created the world’s first commercial UVC germicidal lamps for use in hospitals. And from 1933-35 William F Wells studied droplet nuclei expectoration, revealing UVC can kill droplets of pathogens in the air. He later proved ultraviolet germicidal irradiation stopped measles spreading in public schools, but sadly nobody ever managed to reproduce his results.
UVC technologies boom post-WW2
After the Second World War UVC was used to sterilise the air in hospitals, kitchens, meat storage, food processing, bakeries, dairies, breweries and more. Anywhere microbiological contamination was possible; they used UVC to clean it. And the 1950s saw UCV being brought into use with air handling equipment, a major player in the battle against TB.
Still discovering the magic of UVC
These findings have inspired further research into UVC disinfection, and from the 1990s onwards the research delved even deeper. These days we know exactly which band of wavelengths is the best for killing off HIV, SARS, MERS, hospital acquired infections and, of course, covid. And that’s the band we use in our covid disinfection robots technology.
We’ll help future-proof your business
We’ve come a long way since 1845. Science is still uncovering the finer details behind the many curious benefits of ultraviolet light. And our machines are perfect for helping to keep a multitude of spaces safe for people to enjoy in a covid world, from theatres and dental surgeries to shops, schools, medical centres, and healthcare settings of every kind. If you’d like to future-proof your business, get in touch for a discussion about our fantastic tech.