Ruminococcus gnavus 细菌病在格拉姆染色上显示形态多样性:一个病例报告和文献综述
Tatsuya Hioki1, Kensuke Kataoka2, Yoshikazu Mutoh3
1Department of Clinical Laboratory, Tosei General Hospital, 160 Nishioiwake-cho, Seto, Aichi, 489-8642, Japan.
Access microbiology
|July 10, 2023
概括
肠道细菌Ruminococcus gnavus可以在免疫受损的个体中引起血液感染. 这一案例突出了R. gnavus异常长链形态,有助于其识别.
科学领域:
- 微生物学 微生物学
- 临床医学 临床医学
- 人类肠道微生物群
背景情况:
- 鲁米诺科克斯 (Ruminococcus gnavus) 是人类肠道微生物群中常见的一种Gram阳性无氧菌.
- 它很少引起疾病,通常呈现为Gram染色上的二球菌或短链.
- 感染并不常见,尤其是在其他健康个体中.
研究的目的:
- 报告一个罕见的Ruminococcus gnavus bacteremia病例,发生在免疫受损患者身上.
- 为了描述在这种情况下观察到的R. gnavus的不寻常形态.
- 在初步的Gram染色识别过程中增强R. gnavus的识别.
主要方法:
- 一个73岁的免疫力低下的男性患有西格体结肠穿孔的病例报告.
- 对血液分离物的分析用于细菌识别.
- 引起病原体的格拉姆染色和无氧亚培养.
主要成果:
- 在该患者身上诊断出鲁米诺可克菌根菌病.
- 血液分离结果显示,长链的格拉姆阳性,与典型的形态不同.
- 无氧亚培养揭示了R. gnavus. 的形态多样性.
结论:
- 这一案例表明,Ruminococcus gnavus有可能在免疫受损的宿主中引起细菌病.
- 观察到的形态多样性,包括长链,可以帮助初步识别Gram染色.
- 对各种R. gnavus形态的认识对于准确及时诊断至关重要.
相关概念视频
01:29Microbial Morphologies
53
Bacterial and archaeal cells exhibit remarkable diversity in shape and structure, critical in their adaptability and functionality. Among bacteria, the most commonly observed shapes include cocci and bacilli. Cocci are spherical and may exist singly or in groupings such as pairs (diplococci), chains (streptococci), clusters (staphylococci), or tetrads. Bacilli, in contrast, are rod-shaped and can also occur as single cells, in pairs, or chains, depending on their environmental and genetic...
53
01:24Bacterial Phylum Tenericutes
43
The phylum Tenericutes, which includes the single class Mollicutes, comprises bacteria that lack cell walls. The term "Mollicutes" derives from the Latin word mollis, meaning "soft." These organisms are among the smallest known and are commonly referred to as mycoplasmas due to the prominence of the genus Mycoplasma, which includes well-known human pathogens. Despite their inability to stain gram-positively (a result of their lack of cell walls), mycoplasmas are phylogenetically related to the...
43
01:30Bacterial Phylum Actinobacteria
37
Coryneform bacteria are gram-positive, aerobic, nonmotile rods that exhibit irregular, club-shaped, or V-shaped arrangements. Their V-shape results from snapping division, where the inner cell wall layer forms the cross-wall, while the outer layer remains intact until it ruptures on one side, causing the daughter cells to bend away.The primary genera are Corynebacterium and Arthrobacter. Corynebacterium includes diverse species, ranging from saprophytes to pathogens like Corynebacterium...
37
01:26Bacterial Phylum Bacteroidota
46
The phylum Bacteroidota includes over 700 species classified into four primary orders: Bacteroidales, Cytophagales, Flavobacteriales, and Sphingobacteriales. These gram-negative, non-sporulating rods exhibit saccharolytic capabilities and can be aerobic or fermentative, encompassing obligate aerobes, facultative aerobes, and obligate anaerobes. Many species display gliding motility, though some are nonmotile or use flagella. The genus Bacteroides is well-studied due to its significant role in...
46
01:26Bacterial Phylum Verrucomicrobiota
40
The phylum Verrucomicrobiota comprises at least four characterized orders, with most species classified within the order Verrucomicrobiotales. Members of this phylum are either aerobic or facultatively aerobic, with the ability to ferment sugars. A notable exception is the genus Methylacidiphilum, which consists of aerobic methanotrophs. Additionally, some Verrucomicrobiota establish symbiotic relationships with protists. These bacteria are widely distributed across various environments,...
40
01:26Bacterial Phylum Planctomycetes
36
Planctomycetes are a group of morphologically distinct bacteria predominantly classified into two orders: Planctomycetales and Brocadiales. These gram-negative bacteria exhibit unique features, including division by budding and the presence of stalks or appendages. Their cells are often found in rosette arrangements, and they are notable for possessing an S-layer in their cell envelope, which is relatively uncommon among bacteria. Additionally, Planctomycetes frequently exhibit intracellular...
36