Health risks associated with the presence of antibiotic resistant bacteria in greywater

  • Lidia Nuñez Higiene y Sanidad Facultad de Farmacia y Bioquímica UBA
  • Carina Tornello Higiene y Sanidad Facultad de Farmacia y Bioquímica UBA
  • Noel Puentes Higiene y Sanidad Facultad de Farmacia y Bioquímica UBA
  • Juan Moretton Higiene y Sanidad Facultad de Farmacia y Bioquímica UBA
Keywords: antibiotic- resistance, greywater, β-lactamic antibiotic

Abstract

The removal and disposal of waste from domestic activities is a major health problem in densely populated urban areas. In many areas of Greater Buenos Aires, greywater is disposed in open ditches and risk potential of this has not been adequately quantified. The aim of this study was to evaluate the prevalence of antibiotic-resistant bacteria and its resistance profile present in raw greywater obtained from a channel located in the area of Ingeniero Budge Buenos Aires Province. Thus, the prevalence of heterotrophic bacteria, Gram-negative bacteria resistant to beta-lactam antibiotics and vancomycin-resistant enterococci in greywater, their typing, and resistance to other antibiotics were determined. The prevalence of resistant bacteria was determined by the agar dilution method. Of all the antibiotics tested, the highest prevalence of resistant heterotrophic bacteria was detected with cephalothin (19%) and ampicillin (8%). With regard to Gram-negative bacteria, the highest prevalence of resistance was given by coliforms ampicillin (34%) and cephalothin (17%). A total of 38% of enterococci with low level resistance to vancomycin was detected. The multiresistant isolates were identified as Escherichia coli, Alcaligenes faecalis y Stenotrophomonas maltophilia. These results indicate that greywater can be considered as a reservoir of bacteria resistant to antibiotics, thus increasing their health risk.

Author Biography

Juan Moretton, Higiene y Sanidad Facultad de Farmacia y Bioquímica UBA
Prof titular de la Cátedra de Higiene y Sanidad
Published
27/04/2012
Section
Papers