O139 Serogroup
O139 Serogroup - Related Videos
10:03
Inducing Meningococcal Meningitis Serogroup C in Mice via Intracisternal Delivery
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Cited by 3 •
2019
Here, we describe a method to induce meningococcal meningitis through an intracisternal route of infection in adult mice. We present a step by step protocol of meningococcal infection from the preparation of inoculum to the intracisternal infection; then record the animal survival and evaluate the bacterial loads in murine tissues.
11:40
Humanized Mouse Model to Study Bacterial Infections Targeting the Microvasculature
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Cited by 7 •
2014
Neisseria meningitidis is a human specific pathogen that infects blood vessels. In this protocol human microvessels are introduced into a mouse by grafting human skin onto immunocompromised mice. Bacteria adhere extensively to the human vessels, leading to vascular damage and development of the purpuric rash typically observed in human cases.
FAQs
The O antigen provides an immunologically distinct surface feature that allows researchers to distinguish O139 strains from strains with different surface antigen structures. This distinction matters because antigenic differences can affect immune recognition and help identify which bacterial group is associated with an epidemic. Comparing O-antigen patterns therefore supports epidemiological interpretation rather than merely naming the organism.
After colonization of the small intestine, cholera toxin activates adenylate cyclase through Gs proteins. The resulting increase in intracellular cyclic AMP stimulates chloride secretion into the intestinal lumen, and water follows this ionic movement. This mechanism links bacterial toxin production to the characteristic fluid loss that drives the clinical consequences of cholera.
The capsular polysaccharide provides a surface feature distinct from the O antigen and can influence how the bacterium is recognized by the immune system. It may also support persistence in aquatic environments, connecting cell-surface structure with environmental survival. These properties make the capsule relevant to both host interaction and the ecological context in which O139 strains circulate.
The O antigen is principally useful for immunological distinction and identification of the serogroup, whereas the capsular polysaccharide has additional relevance to immune recognition and possible persistence in aquatic environments. Considering both structures gives a broader view of O139 biology: one helps characterize strain identity, while the other may influence survival and interactions with host defenses.
Identifying the O139 Serogroup helps researchers track outbreaks and distinguish circulating strains associated with epidemic cholera. Because the serogroup is defined by a recognizable O-antigen structure, it provides an antigenic marker for comparing bacterial populations during epidemiological studies. This information can clarify whether related cases involve the same circulating group or reflect differences in strain composition.
Vaccine coverage must be interpreted in relation to the antigenic features of circulating bacteria. The O139 Serogroup has an immunologically distinct O antigen, so monitoring its occurrence helps researchers assess whether vaccine protection corresponds to the strains present in a population. Such surveillance also reveals how changes in antigenic patterns may influence the continuing effectiveness of prevention strategies.
O139 research connects events at several biological levels. Colonization of the small intestine and toxin-driven secretion explain disease processes, while the capsular polysaccharide may support persistence in aquatic environments. Tracking these features alongside antigenic variation helps researchers relate bacterial mechanisms to environmental circulation, outbreak patterns, and changes in the strains responsible for epidemic cholera.