Environmental Factors Affecting the Occurrence of Mycobacteria in Brook Waters

Iivanainen, Eila; Martikainen, Pertti J.; P, Väänänen; Katila, Marja–Leena

doi:10.1128/aem.59.2.398-404.1993

Cited by 80 publications

(68 citation statements)

References 26 publications

(22 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The occurrence of mycobacteria in different waters and soils has been extensively studied (Kazda 1973a,b;Falkinham et al 1980;George et al 1980;Brooks et al 1984;Kirschner et al 1992;von Reyn et al 1993;Donoghue et al 1997) but so far, the factors affecting the occurrence of mycobacteria in the environment are not fully understood. Mycobacteria in the brook waters and soils of Finnish drainage areas, which are also the subject of the present study, were studied previously and it was found that high numbers of mycobacteria in brook waters correlated with low pH and high content of organic matter in water, and with a high proportion of peatland in the drainage area (Iivanainen et al 1993). These phenomena have been detected earlier in other waters (Kazda 1973a,b;…”

Section: Introductionmentioning

confidence: 59%

Environmental factors affecting the occurrence of mycobacteria in brook sediments

Iivanainen

Martikainen

Väauml

et al. 1999

Journal of Applied Microbiology

Self Cite

View full text Add to dashboard Cite

E. IIVANAINEN, P.J. MARTIKAINEN, P. VÄ Ä NÄ NE N A N D M .-L . K AT I LA . 1999. The occurrence of mycobacteria was studied in aerobic brook sediments from 39 drainage areas in Finland. The culturable counts of mycobacteria were related to climatic conditions, characteristics of the drainage area, chemical characteristics of the sediment and water, culturable counts of other heterotrophic bacteria, and microbial respiration rate in the sediment. The counts of mycobacteria varied from 1·1 × 10 2 to 1·5 × 10 4 cfu g −1 dry weight of sediment. They correlated positively with the proportion of the drainage area consisting of peatland, total content of C, content of Pb, microbial respiration rate in the sediment, and chemical oxygen demand of the water. The correlations of the mycobacterial counts with pH of sediment and alkalinity of water were negative. The results of the present sediment study and of the forest soil study published earlier strongly suggest that an increase in acidity increases the counts of mycobacteria and decreases the counts and activity of other heterotrophic bacteria. Mycobacterial counts were more than 100 times higher (per dry weight) in forest soils with pH 3·5-4·3 than in sediments with pH 4·5-6·3.

show abstract

Section: Introductionmentioning

confidence: 59%

Environmental factors affecting the occurrence of mycobacteria in brook sediments

Iivanainen

Martikainen

Väauml

et al. 1999

Journal of Applied Microbiology

Self Cite

View full text Add to dashboard Cite

show abstract

“…intracellulare were unable to grow in filtered natural waters at pH values above pH 6.9 and 7.3, respectively (Kazda 1973b). Iivanainen et al (1993), who examined a very acidic environment in Finland, noted a very strong negative Portaels and Pattln 1982), with some fast growers such as Myco. fiwtuiturn able to grow at pH 9.0.…”

Section: Discussionmentioning

confidence: 99%

A longitudinal study of environmental mycobacteria on a farm in south-west England

1997

View full text Add to dashboard Cite

Soil, stream beds and cattle drinking troughs were sampled every 3 months over 3 years. More than 750 putative mycobacteria were isolated and grouped into more than 50 biotypes pending full identification. Samples from woodland and farmed land yielded fewer isolates per site compared with other terrains (P < 0.05). Some seasonal effects were noted but the greatest difference was between years 1 and 3. This appeared not to be due to differences in temperature, rainfall or experimental procedure, but coincided with the introduction of organic farming practices. In year 3 there was a significant increase in nitrate‐reducing slow growers, both pigmented (P≤ 0.006) and non‐pigmented strains (P≤ 0.002), and a shift in biotypes was noted. In contrast, all fast growers declined with time, as did those slow growers unable to reduce nitrate. Changing farming practice may alter the profile of environmental mycobacteria, which has important implications for the immunological priming of humans and animals.

show abstract

“…Reports from other countries followed. In Finland, various unidentified RGM were cultured from brook waters [14]. In the USA, surface waters yielded Mycobacterium mucogenicum, M. chelonae and M. fortuitum complex isolates [15].…”

Section: Watermentioning

confidence: 99%

Environmental sources of rapid growing nontuberculous mycobacteria causing disease in humans

Ingen

Boeree

Dekhuijzen

et al. 2009

Clinical Microbiology and Infection

108

View full text Add to dashboard Cite

Nontuberculous mycobacteria are environmental, opportunistic pathogens whose role in human disease is increasingly recognized, especially regarding the rapid growing mycobacteria (RGM). RGM are recovered from various environmental sources, both natural and man-made. In water systems, RGM can survive by forming biofilms and by interactions with protozoa. The presence and species diversity of RGM in water is influenced by temperature, pH and the chemical quality of the water, as well as the availability of nutrients, although the exact correlations remain controversial. Despite their omnipresence in environmental sources, the actual transmission of RGM to humans, with subsequent clinical disease, has rarely been proven. However, outbreaks as a result of contaminated water sources have been reported, although accidental presence in clinical samples cannot always be excluded. In this setting, the presence of RGM does not necessarily indicate a causal relationship with clinical disease; accidental presence in clinical samples cannot always be excluded. Future studies should focus on the exact environmental sources of infection, aiming to examine possibilities for prevention of infections in patients at risk. Furthermore, studies should focus on the actual sites of the active replication of RGM; their presence may not indicate their natural habitat.

show abstract

Environmental Factors Affecting the Occurrence of Mycobacteria in Brook Waters

Cited by 80 publications

References 26 publications

Environmental factors affecting the occurrence of mycobacteria in brook sediments

Environmental factors affecting the occurrence of mycobacteria in brook sediments

A longitudinal study of environmental mycobacteria on a farm in south-west England

Environmental sources of rapid growing nontuberculous mycobacteria causing disease in humans

Contact Info

Product

Resources

About