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    Review of 'Airborne bacterial species in indoor air and association with physical factors <span class="so-article-trans-title" dir="auto"> Translated title: Luftbårne bakterier i indekliamet og sammenhæng med fysiske forhold </span>'

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    Airborne bacterial species in indoor air and association with physical factors <span class="so-article-trans-title" dir="auto"> Translated title: Luftbårne bakterier i indekliamet og sammenhæng med fysiske forhold </span>Crossref
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        Rated 4.5 of 5.
    Level of importance:
        Rated 5 of 5.
    Level of validity:
        Rated 5 of 5.
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        Rated 4 of 5.
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        Rated 4 of 5.
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    Airborne bacterial species in indoor air and association with physical factors Translated title: Luftbårne bakterier i indekliamet og sammenhæng med fysiske forhold

    The aim of this study is to obtain knowledge about which cultivable bacterial species are present in indoor air in homes, and whether the concentration and species composition of airborne bacteria is associated with different factors. Measurements have been performed for one whole year inside different rooms in 5 homes and once in 52 homes. Within homes, a room-to-room variation for concentrations of airborne bacteria was found, but an overlap in bacterial species was found across rooms. Eleven species were found very commonly and included: Acinetobacter lowffii , Bacillus megaterium, B. pumilus , Kocuria carniphila , K. palustris , K. rhizophila, Micrococcus flavus , M. luteus, Moraxella osloensis, and Paracoccus yeei . The concentrations of gram-negative bacteria in general and the species P. yeei were significantly associated with the season with highest concentrations in spring. The concentrations of P. yeei , K. rhizophila , and B. pumilus were associated positively with relative humidity, and concentrations of K. rhizophila were associated negatively with temperature and air change rate. Micrococcus flavus concentrations were associated negatively with air change rate. Overall, this study identified species which are commonly present in indoor air in homes, and that the concentrations of some species were associated with the factors: season, air change rate, and relative humidity.
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      Review information

      10.14293/S2199-1006.1.SOR-LIFE.ACX6EG.v1.RMQHYS
      This work has been published open access under Creative Commons Attribution License CC BY 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Conditions, terms of use and publishing policy can be found at www.scienceopen.com.

      Life sciences
      Paracoccus yeei,exposure,indoor air,Built environment,indoor humidity,bacteria,MALDI-TOF MS,Bacillus megaterium,Health,seasonality,room-to-room variation,home environment

      Review text

      A fascinating piece of work! The assessment of indoor bacterial growth has been rarely done using air sampling, which makes this study highly valuable.

       

      A few minor comments that could help readers better understand the context of this study.

       

      1. Was the environmental setting (i.e., RH, Temperature, activities carried out by occupants, the opening of windows, level of cleanliness) monitored prior to sampling? Could some of the indoor environmental conditions have affected the results reported?
      2. Were the results from the living rooms of the 5 homes tested for studies A and B included in study C? If not, would it be of value to add the results of the 5 living rooms to the 52 samples?
      3. Could you please mention how many of the 52 living rooms in study C were tested during each season? This would allow readers to see the distribution of samples in each season.
      4. Could you please briefly mention the methods used to monitor the RH, T, ACH in the studies you cited (12, 17, 21)?
      5. Please insert the axis title in figure 1 
      6. It would be very helpful if we could also see the composition of bacteria with different seasons. This would help the readers to visualize the potential changes in the concentration of the most dominant species with seasons.
      7. Would it be possible to report some key features like the temperatures, RH, and ACH measurements for the tested properties? These would help readers to understand better the relationship between the environmental context and the bacterial readings.

       

       

       

       

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