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Applicability of UV resistant Bacillus pumilus endospores as a human adenovirus surrogate for evaluating the effectiveness of virus inactivation in low-pressure UV treatment systems
Boczek, L., E. Rhodes, J. Cashdollar, J. Ryu, J. Popovici, J. Hoelle, Mano Sivaganesan, Sam Hayes, M. Rodgers, AND H. Ryu. Applicability of UV resistant Bacillus pumilus endospores as a human adenovirus surrogate for evaluating the effectiveness of virus inactivation in low-pressure UV treatment systems. JOURNAL OF MICROBIOLOGICAL METHODS. Elsevier Science Ltd, New York, NY, 122:43-49, (2016).
This article describes the usefulness of Bacillus pumilus endspores as a viable surrogate for adeno virus in UV disinfection studies.
Recent studies have demonstrated the potential to use Bacillus pumilus endospores as a surrogate of human adenovirus (HAdV) in UV disinfection studies. The use of endospores has been limited by observations of batch-to-batch variation in UV sensitivity. This study reports on a propagation method that utilizes a commercially available medium to produce UV tolerant B. pumilus endospores with a consistent UV sensitivity. It is further demonstrated that the endospores B. pumilus strain (ATCC 27142), produced using this protocol (half strength Columbia broth, 5 days incubation, with 0.1mM MnSO4), display a UV dose-response that is similar to that of HAdV. Endospore stocks could be stored in ethanol for up to two month at 4C without a significant change in UV sensitivity. Synergistic endospore damage by pre-pasteurization of water samples was observed, suggesting post-pasteurization only of UV treated water samples. UV tolerant B. pumilus endospores are a potential surrogate of HAdV for UV treatment performance tests in water utilities which do not have in-house research virology laboratories.