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INACTIVATION OF FELINE CALICIVIRUS AND ADENOVIRUS TYPE 40 BY ULTRAVIOLET RADIATION

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Little information regarding the effectiveness of ultraviolet (UV) radiation on the inactivation of caliciviruses and enteric adenoviruses is available. Analysis of human calicivirus resistance to disinfectants is hampered by the lack of animal or cell culture methods which can determine their infectivity. The inactivation kinetics of enteric adenovirus type 40 (AD40), coliphage MS-2 and feline calicivirus (FCV), closely related to the human caliciviruses based on nucleic acid organization and capsid architecture, were determined after exposure to low pressure UV radiation in buffered demand free (BDF) water at room temperature. In addition, UV disinfection experiments were also carried out in treated groundwater with AD40 and FCV. AD40 was more resistant than either FCV or coliphage MS-2 in both BDF and natural waters at room temperature. The doses of UV required to achieve 99 % inactivation of AD40, coliphage MS-2 and FCV in BDF water were 109, 59 and 17 mWs/cm2, respectively. The doses of UV required to achieve 99 % inactivation of AD40 and FCV in groundwater were slightly less than in BDF water. FCV was inactivated by 99 % by 14 mWs/cm2 in treated groundwater. A dose of 103 mWs/cm2 was required for 99 % inactivation of AD40 in treated groundwater. The results of this study indicate that if FCV is an adequate surrogate for human caliciviruses, then their inactivation by UV radiation is similar to other single-stranded RNA enteric viruses such as poliovirus. In treated groundwater, the kinetics of AD40 and FCV UV light inactivation appear to be increased by water constituents. AD40 appears to be more resistant to UV disinfection than previously reported.
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Document Type: Research Article

Publication date: 01 January 2002

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