Under LT2, UV disinfection is specified to provide at least a log removal/inactivation for which organism?

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Multiple Choice

Under LT2, UV disinfection is specified to provide at least a log removal/inactivation for which organism?

Explanation:
LT2 focuses on protecting drinking water from the most chlorine-resistant parasite in surface waters. UV disinfection is specified to achieve at least a log removal/inactivation of Cryptosporidium because Cryptosporidium oocysts are highly resistant to chemical disinfectants like chlorine, making UV treatment essential to reliably inactivate them. UV works by damaging the organism’s genetic material, preventing replication, which is particularly effective for Cryptosporidium. While Giardia can also be inactivated by UV, the LT2 requirement targets Cryptosporidium due to its significant role in waterborne illness from surface waters. Vibrio and Legionella are bacteria and are not the primary focus of this particular LT2 UV log-inactivation requirement.

LT2 focuses on protecting drinking water from the most chlorine-resistant parasite in surface waters. UV disinfection is specified to achieve at least a log removal/inactivation of Cryptosporidium because Cryptosporidium oocysts are highly resistant to chemical disinfectants like chlorine, making UV treatment essential to reliably inactivate them. UV works by damaging the organism’s genetic material, preventing replication, which is particularly effective for Cryptosporidium. While Giardia can also be inactivated by UV, the LT2 requirement targets Cryptosporidium due to its significant role in waterborne illness from surface waters. Vibrio and Legionella are bacteria and are not the primary focus of this particular LT2 UV log-inactivation requirement.

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