Microbial contamination of books in the library

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  • Nomura Saki
    山陽小野田市立　山口東京理科大学　薬学部　薬学科
  • Ushima Akira
    山陽小野田市立　山口東京理科大学　薬学部　薬学科
  • Funaki Ryosuke
    山陽小野田市立　山口東京理科大学　薬学部　薬学科
  • Oie Shigeharu
    山陽小野田市立　山口東京理科大学　薬学部　薬学科

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Other Title
  • 図書の微生物汚染
  • トショ ノ ビセイブツ オセン

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<p>We investigated the state of contamination by microorganisms in 173 library books and found the surfaces of the books to have contaminants ranging from <12 to 4.9 x 10 4 colony-forming units (cfu)/ cover. We found 81.5% of the books tested to have the range of contaminant load counting 0 to 960 cfu/cover; the mean number of contaminant ± standard deviation was 1,261 ± 4,482 cfu/cover. The main contaminants included some environmental bacteria, such as Bacillus atrophaeus and Bacillus cereus, and a skin microbial flora consisting of coagulase (-) staphylococci and Micrococcus spp. On the other hand, methicillin-sensitive Staphylococcus aureus was detected in 4 (2.3%) of the 173 books, and the numbers ranged from 12 to 420 cfu/cover. We did not detect any coliform bacteria or Pseudomonas aeruginosa on the books that were sampled. We found the library books investigated in this study relatively clean.</p>

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