河流和溪流中D群链球菌的分布

Distribution of group D streptococci in rivers and streams.

作者信息

Ator L L, Starzyk M J

出版信息

Microbios. 1976;16(64):91-104.

Abstract

A study was undertaken to determine sources of bacteriological contamination of rivers as well as the ecology of faecal streptococci in natural and contaminated waters. Media used to characterize and speciate group D streptococci were also evaluated using isolates from the water and sediment. Due to the low concentrations of faecal coliforms (FC) and faecal streptococci (FS) in river water samples, the FC/FS ratio was shown to be of little value in determining sources of contamination. High concentrations of FC and FS from sediment samples gave more credible FC/FS ratios. The actual distribution of group D streptococcal species in rivers and streams was also shown. High concentrations of all division II species (S. faecium, S. faecium var. casseliflavus, and S. faecium var. durans) were found in the water and sediment samples, with S. faecium var. durans comprising 50% of the total number of isolates. Low concentrations of division I group D streptococci (S. faecalis and varieties) were found, while only one isolation of division III group D streptococci (S. bovis and S. equinus) was made.

摘要

开展了一项研究，以确定河流细菌污染的来源以及天然水和受污染水中粪链球菌的生态学。还使用从水和沉积物中分离出的菌株对用于鉴定和区分D群链球菌的培养基进行了评估。由于河水样本中粪大肠菌群（FC）和粪链球菌（FS）的浓度较低，结果表明FC/FS比值在确定污染来源方面价值不大。沉积物样本中高浓度的FC和FS给出了更可靠的FC/FS比值。还展示了河流和溪流中D群链球菌种类的实际分布情况。在水和沉积物样本中发现了所有第二类菌株（屎肠球菌、黄色屎肠球菌变种和耐久屎肠球菌变种）的高浓度，其中耐久屎肠球菌变种占分离菌株总数的50%。发现第一类D群链球菌（粪肠球菌及其变种）的浓度较低，而仅分离出一例第三类D群链球菌（牛链球菌和马肠链球菌）。