Low- and medium-pressure UV inactivation of microsporidia Encephalitozoon intestinalis

Newly recognized waterborne pathogens such as microsporidia are being detected in the worldʹs water supplies with increasing frequency. Many of these organisms have been shown to cause negative health impacts for both immunocompetent as well as immunocompromised individuals. It is imperative that these emerging pathogens be investigated for their ability to resist both traditional and novel disinfection technologies that are currently in use or under consideration for drinking water treatment. Low- and medium pressure UV light is at the cutting edge of disinfection technologies for the drinking water industry. While previous UV disinfection studies have focused on the inactivation of Cryptosporidium and Giardia as well as viruses and common bacteria, this research reports the ability of low- and medium pressure UV light to inactivate >3.6 log10 of microsporidia Encephalitozoon intestinalis spores at a dose of 6 mJ/cm2 or higher as determined using a cell culture approach.