Comparison of UV inactivation of spores of three Encephalitozoon species with that of spores of two DNA repair-deficient Bacillus subtilis biodosimetry strains

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When exposed to 254-nm UV, spores of Encephalitozoon intestinalis, Encephalitozoon cuniculi, and Encephalitozoon hellem exhibited 3.2-log reductions in viability at UV fluences of 60, 140, and 190 J/m2, respectively, and demonstrated UV inactivation kinetics similar to those observed for endospores of DNA repair-defective mutant Bacillus subtilis strains used as biodosimetry surrogates. The results indicate that spores of Encephalitozoon spp. are readily inactivated at low UV fluences and that spores of UV-sensitive B. subtilis strains can be useful surrogates in evaluating UV reactor performance.

ASJC Scopus subject areas

  • Environmental Science(all)
  • Biotechnology
  • Microbiology

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