OBJECTIVES This study was designed to determine the role of flushing dental water lines for the removal of heterotrophic plate count bacteria, Legionella spp., and free-living protozoa. METHODS Forty dental offices were surveyed in the study. An initial sample and a sample taken after three minutes of flushing were obtained from the air/water syringe at each location. All samples were quantit...

Historically, heterotrophic plate counts are enumerated using a pour plate method, whereby plates are read manually. This analysis is important to evaluate the maintenance of water disinfection in a reticulation system. Advances in media and technology have made it possible to do this evaluation using defined substrate media and enumeration is performed by means of instrumentation using softwar...

mT7 medium performed no better than m-Endo medium in enumerating cells of Escherichia coli and Citrobacter freundii exposed to ozone. Also, there was no difference in the plate count of heterotrophic bacteria in ozonated raw water determined on modified Henrici agar or R2A agar. Statistically significant differences were seen between bacteria and the type of water in which they were suspended d...

The presence of pan-resistant bacteria worldwide possesses a threat to global health. It is difficult to evaluate the extent of carriage of resistant bacteria in the population. Sewage sampling is a possible way to monitor populations. We evaluated the presence of pan-resistant bacteria in Israeli sewage collected from all over Israel, by modifying the pour plate method for heterotrophic plate ...

BACKGROUND Samples of drinking water were collected directly from the personal water bottles of students at an elementary school in Calgary, Alberta. METHODS Total and fecal coliforms and heterotrophic bacteria were enumerated using membrane filtration and agar plate count methods respectively. RESULTS The Canadian Drinking Water Quality Guidelines (CWQG) criterion was exceeded for total co...

background; providing safe drinking water is a prime concerninany community. this analytical study was carried out to evaluate the microbial quality of drinking water in rural areas of northeastern iran. methods;the water microbial quality was determined in all villages (a population of 53047 people), in 3 rounds and based on 3 measurements, i.e. total coliform, fecal coliform, and heterotrophi...

background: this study investigated the interaction between heterotrophic bacteria and coliform, fecal coliforms, fecal streptococci bacteria in water supply networks. methods: this study was conducted during 2013 on water supply distribution network in aq qala city, golestan province, northern iran and standard methods were applied for microbiological analysis. the surface method was applied t...