Survival of Mycobacterium avium in a model distribution system.
نویسندگان
چکیده
A pilot study was designed to examine the impact of nutrient levels, pipe materials, and disinfection on the survival of M. avium in model drinking water distribution system biofilms. Studies showed that the survival of the organism was dependant upon a complex interaction between pipe surface, nutrient levels, and disinfectants. The findings showed that when no disinfection was applied, M. avium could be recovered from biofilms at nutrient levels of 50microg/L assimilable organic carbon. M. avium concentrations were lower on copper pipe surfaces following disinfection with free chlorine as compared to monochloramine. However, due to the interference of corrosion products, chloramination of iron pipe surfaces controlled M. avium levels better than free chlorine. These data demonstrate the significance of pipe materials on the survival of M. avium complex in biofilms. Elimination of competitive heterotrophic bacteria on copper pipe surfaces by the application of disinfection resulted in a population of nearly 100% M. avium. Heat treatment of M. avium biofilms was affected by the pipe composition and organic content of the water. Effluent temperatures >53 degrees C were required to control the occurrence of M. avium in the pipeline system. Although additional studies are required using improved detection methods, the results of this investigation suggest that reducing the biodegradable organic material in drinking water, control of corrosion, maintenance of an effective disinfectant residual, and management of hot water temperatures can help limit the occurrence of M. avium complex in drinking water biofilms.
منابع مشابه
Genomic Detection of Mycobacterium Avium Subspecies Paratuberculosis in Blood Samples of Patients with Inflammatory Bowel Disease in Southern Iran
Background: Inflammatory bowel disease (IBD), of which Crohn’s disease (CD) and ulcerative colitis (UC) are the two main clinicopathological subtypes, is a group of digestive system diseases of unknown etiology. Risk factors for IBD are environmental factors, genetics, and immune system agents. Mycobacterium avium subspecies paratuberculosis (MAP) is one of the most important infectious factors...
متن کاملMycobacterium avium subsp. paratuberculosis induces differential cytosine methylation at miR-21 transcription start site region
Mycobacterium aviumsubspecies paratuberculosis (MAP), as an obligate intracellular bacterium, causes paratuberculosis (Johne’s disease) in ruminants. Plus, MAP has consistently been isolated from Crohn’s disease (CD) lesions in humans; a notion implying possible direct causative ...
متن کاملDetection of Mycobacterium avium subsp. paratuberculosis in Cow Milk Using Culture and PCR methods
Mycobacterium avium subspecies paratuberculosis (MAP) is the cause of John’s disease also called paratuberculosis. This is economically one of the important infectious diseases in cattle and ruminant husbandry. This disease is manifested as granulomatosis entrocolitis, lymphadenitis and inflammation local lymphatic vessels. The typical sign of this disease is progressive loss of weight. Cons...
متن کاملGenomic Characterization of the Vaccinal Strain of Mycobacterium Avium Subspecies Paratuberculosis (MAP) 316F by MIRU-VNTR
Abstract Background and Objective: Paratuberculosis is a chronic granulomatous enteritis of ruminants caused by Mycobacterium avium subspecies paratuberculosis (MAP). this study aimed to characterize the genome of the MAP 316F strain. Methods: The MAP 316F strain was subjected to the PCR-F57 and PCR-IS900 experi...
متن کاملDetection of Mycobacterium avium subsp. paratuberculosis in the mesenteric lymph nodes of goats by PCR and culture
The efficacy of bacterial cultures and IS900-specific polymerase chain reaction (PCR) was compared for the detection of Mycobacterium avium subsp. paratuberculosis (MAP) from the mesenteric lymph nodes of goats. Samples were collected from 75 goats slaughtered in Ilam, in southwest of Iran. Tissue homogenates were inoculated onto four media. The genomic DNA was extracted directly from mesenteri...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید
ثبت ناماگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید
ورودعنوان ژورنال:
- Water research
دوره 38 6 شماره
صفحات -
تاریخ انتشار 2004