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Pathogens in Ornamental Waters: A Pilot Study.

Maria Nascimento1, Joao Carlos Rodrigues2, Lucia Reis3

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Ornamental park waters harbor human pathogens like Klebsiella pneumoniae and Aeromonas spp., posing health risks. Bacteria in biofilms showed higher antibiotic resistance than free-floating ones.

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Area of Science:

  • Environmental microbiology
  • Public health microbiology

Background:

  • Ornamental park waters are accessible to the public, especially children.
  • These water bodies can harbor microorganisms, including potential human pathogens.

Purpose of the Study:

  • To characterize the microbiota of ornamental waters in a Lisbon park.
  • To identify potential human pathogens and antibiotic-resistant bacteria in these environments.

Main Methods:

  • Microbiological analysis of water samples collected in 2015.
  • Identification of bacterial species, including Klebsiella pneumoniae and Aeromonas spp.
  • In vitro experiments to assess biofilm formation and antibiotic resistance.

Main Results:

  • The study identified a dynamic microbiota including human pathogens Klebsiella pneumoniae, Aeromonas spp., and Enterobacter spp.
  • Klebsiella pneumoniae and Aeromonas spp. were found in both planktonic and biofilm states.
  • Bacteria from biofilms exhibited increased antibiotic resistance compared to planktonic bacteria.

Conclusions:

  • Ornamental park waters can be a reservoir for pathogenic and antibiotic-resistant bacteria.
  • Biofilm formation may enhance bacterial survival and antibiotic resistance in these aquatic environments.
  • Findings highlight potential risks to human health from recreational exposure to park waters.