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Current microbiological challenges in drinking water
Afonso, Ana C.; Saavedra, Maria J.; Gomes, Inês B.; Simões, Manuel; Simões, Lúcia ChavesDrinking water (DW) is paramount to human health, serving as a cornerstone of public health worldwide. However, DW is not a sterile product and can harbor a large diversity of microorganisms, including pathogens. This comprehensive review addresses the critical importance of DW for human health and the ongoing challenges posed by microbial pathogens and biofilms in water distribution systems. It further analyze...
Coaggregation dynamics in drinking water biofilms and implications for chlorine...
Afonso, Ana C.; Gomes, Inês B.; Massano, Francisca; Saavedra, Maria J.; Simões, Manuel; Simões, Lúcia ChavesBiofilms in drinking water (DW) systems persistently challenge traditional disinfection methods due to intricate microbial interactions, with coaggregation playing a crucial role in forming multispecies biofilms. This study examined the implications of coaggregation on tolerance towards sodium hypochlorite (NaOCl) disinfection. Dual-species biofilms were formed for seven days on polyvinyl chloride coupons, comp...
Bacterial coaggregation’s role in water disinfection resistance
Afonso, Ana C.; Gomes, Inês B.; J. Saavedra, Maria; Simões, Lúcia C.; Simões, ManuelBackground: In the realm of water treatment and public health, the interplay between microorganisms and disinfection processes represents a constant and dynamic challenge [1]. As society strives to ensure the availability of safe and clean water, understanding the factors contributing to bacterial resistance to water disinfection emerges as a critical area of research [1]. Among these factors, the phenomen...
Synergistic bactericidal combinations: far-UV-C, mechanical cleaning and chlori...
Sousa, Mariana; Oliveira, Isabel M.; Correia, Liliana; Gomes, Inês B.; Sousa, Cátia A.; F. O. Braga, Daniel; Simões, ManuelBackground: The issue of indoor contamination stands as a global health challenge, contributing to the spread of infectious diseases [1,2]. Consequently, there is an urgent need to explore new disinfection strategies that rely on reduced concentrations of conventional cleaning chemicals [3,4]. Objective: This study aimed to explore innovative disinfection approaches utilizing far-UV-C (222 nm) radiation al...
Environmental exposure to parabens affects drinking water bacterial virulence
Pereira, Ana Rita; Gomes, Inês B.; Lopes, Beatriz; Simões, ManuelBackground: Drinking water distribution systems are known to harbor biofilms, constituting a source of microorganisms that may be released in drinking water (DW) through a consumer's tap [1]. The exposure of these biofilms to parabens is inevitable [2]. However, their effects on microbial virulence and their impact on DW quality and safety remain poorly understood. Objective: This work evaluates the changes in ...
Elucidating bacterial coaggregation through a physicochemical and imaging surfa...
Afonso, Ana C.; Botting, Jack; Gomes, Inês B.; Saavedra, Maria J.; Simões, Lúcia Chaves; Liu, Jun; Simões, ManuelBacterial coaggregation is a highly specific type of cell-cell interaction, well-documented among oral bacteria, and involves specific characteristics of the cell surface of the coaggregating strains. However, the understanding of the mechanisms promoting coaggregation in aquatic systems remains limited. This gap is critical to address, given the broad implications of coaggregation for multispecies biofilm form...
Novel chemical-based approaches for biofilm cleaning and disinfection
Fernandes, Susana; Gomes, Inês B.; Simões, Manuel; Simões, Lúcia ChavesBiofilm formation plays a critical concern in the food processing industry due to potential environmental, economic, and food spoilage impacts. To maintain microbial safe levels, a sanitation process, comprising cleaning and disinfection steps, needs to be periodically performed. Biocide treatment for surface disinfection is the most widely applied strategy. Owing to the critical failure of current sanitation p...
Coaggregating Delftia acidovorans facilitates the metabolic activity of partner...
Afonso, A. C.; Gomes, Inês B.; Saavedra, M. J.; Simões, Lúcia Chaves; Simões, ManuelAlthough bacterial coaggregation has already been identified as a key mechanism in the multispecies biofilms development in diverse environments, little is known about this highly specific type of cell-cell interaction in aquatic systems. In this study, a strain of Delftia acidovorans isolated from drinking water (DW) and previously described with coaggregation ability, was studied for its role in biofilm devel...
Drinking-water isolated Delftia acidovorans selectively coaggregates with partn...
Afonso, Ana C.; Gomes, Inês B.; Saavedra, Maria José; Simões, Lúcia Chaves; Simões, ManuelCoaggregation plays an important role in the development of multispecies biofilms in different environments, often serving as an active bridge between biofilm members and other organisms that, in their absence, would not integrate the sessile structure. The ability of bacteria to coaggregate has been reported for a limited number of species and strains. In this study, 38 bacterial strains isolated from drinking...
Realism-based assessment of the efficacy of potassium peroxymonosulphate on Ste...
Oliveira, Isabel M.; Gomes, Inês B.; Moniz, Tânia; Simões, Lúcia Chaves; Rangel, Maria; Simões, ManuelThe potential of pentapotassium bis(peroxymonosulphate) bis(sulphate) (OXONE) to control biofilms in drinking water distribution systems (DWDS) was evaluated and compared to chlorine disinfection. Mature biofilms of drinking water (DW)-isolated Stenotrophomonas maltophilia were formed using a simulated DWDS with a rotating cylinder reactor (RCR). After 30 min of exposure, OXONE at 10 × minimum bactericidal conc...