Ozone against Pseudomonas aeruginosa biofilms in contact lenses storage cases

• Published in: Revista do Instituto de Medicina Tropical de São Paulo
• Main Authors: Josidel Conceição Oliver, Paula Anatália Pereira Bredarioli, Fabrício Damasceno Leandro, Carla Benedini Ribeiro Jorge Ferreira, Sandra Maria Oliveira Morais Veiga, Amanda Latercia Tranches Dias
• Format: Article in Journal/Newspaper
• Language: English
• Published: Universidade de São Paulo (USP) 2019
• Subjects: Ozonized water; Chlorhexidine; Ultrasound; Multipurpose solutions; Decontamination; Arctic medicine. Tropical medicine; RC955-962; Infectious and parasitic diseases; RC109-216; Arctic
• Online Access: https://doi.org/10.1590/s1678-9946201961023; https://doaj.org/article/9195ce942f714498b87b1d80845e566d

ABSTRACT Pseudomonas aeruginosa is associated with ocular infections such as keratitis. Multipurpose contact lens solutions can be used for washing, disinfection and storage of contact lenses, however, P. aeruginosa biofilm disinfection by this method is unsatisfactory. The present study aimed to investigate the effectiveness of ozonated water in reducing P. aeruginosa colony count. Lenses kept in storage cases were contaminated with P. aeruginosa and disinfected using ozonized water, chlorhexidine, ultrasound and multipurpose solutions. The multipurpose solutions and ultrasound methods reduced colony count from 1.17 to 1.63 log10 CFU/cm2 (92.93% to 97.31%), respectively, of P. aeruginosa biofilm cell viability when compared to the positive control. Both, ozonated water and chlorhexidine showed 7.42 log reduction in the number of viable cells of P. aeruginosa biofilm. As compared to chlorhexidine, ozonized water did not depose any known toxic residues, so that we recommend it as an alternative disinfectant solution for contact lenses storage cases.