Analysis of the population change of microorganisms on hand skin by usage of alcohol-based hand sanitizer

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  • アルコールベース速乾性擦り込み式手指消毒剤の使用による菌交代についての検討
  • アルコールベース ソッカンセイ スリコミ シキ テサシ ショウドクザイ ノ シヨウ ニ ヨル キン コウタイ ニ ツイテ ノ ケントウ

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<p>　Prevention of Bacillus cereus bloodstream infection during the use of infusion systems has recently become a critical issue for the prevention of nosocomial infections. We assessed whether usage of large volumes of alcohol-based hand sanitizer may result in microbial substitution, of alcohol-sensitive microorganisms by alcohol-resistant B. cereus, on hands. Hospital wards were divided into 3 groups, those with the highest usage (>500 L/month), medium usage (about 200L/month) and lowest usage (<50 L/month). In the highest and medium usage groups, but not the lowest group, the numbers of Gram-positive cocci recovered by swabbing the palms of workers were significantly lower after than before their shifts (p<0.05). However, the number of Bacillus cereus colonies were significantly (p<0.05) increased in the highest usage group. Based on the number of Gram-positive cossus colonies on the palms before work, the subjects were classified into three groups; those with <10 (group I), 10-99 (Group II) and >99 (Group III) Gram-positive coccus colonies. In Group I, the number of Gram-positive coccus colonies on the palm were significantly (p<0.05) decreased after work, whereas the number of B. cereus colonies were not changed, making it unlikely that usage of alcohol-based hand sanitizer resulted in bacterial substitution, from alcohol-sensitive to alcohol-resistant bacteria, on the palm. Although samples were collected from subjects after hygienic hand-wash with soap and running water for at least 30 seconds, the number of B. cereus colonies in group I significantly increased after the work, suggesting that the hygienic hand-wash itself cannot wash out residential B. cereus. These findings suggest that wearing gloves during the drip infusion procedure may be effective for preventing B. cereus bloodstream infection during the use of infusion systems.</p>

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