Pneumococcal Isolate
Pneumococcal Isolate - Related Videos
07:47
Experimental Human Pneumococcal Carriage
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Cited by 80 •
2013
Experimental human pneumococcal carriage offers a natural model of carriage and a potential model for use in vaccine development. This technique is valuable yet complex and involves clinical risk by introducing a pathogen into a human. We have developed a detailed protocol.
09:20
Investigating the Effects of Probiotics on Pneumococcal Colonization Using an In Vitro Adherence Assay
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Cited by 8 •
2014
In vitro adherence assays can be used to study the attachment of Streptococcus pneumoniae to epithelial cell monolayers and to investigate potential interventions such as the use of probiotics for inhibiting pneumococcal colonization.
11:32
Following in Real Time the Impact of Pneumococcal Virulence Factors in an Acute Mouse Pneumonia Model Using Bioluminescent Bacteria
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Cited by 18 •
2014
Streptococcus pneumoniae is the leading pathogen causing severe community-acquired pneumonia and responsible for over 2 million deaths worldwide. The impact of bacterial factors implicated in fitness or virulence can be monitored in real-time in an acute mouse pneumonia or bacteremia model using bioluminescent bacteria.
03:20
Evaluating Pneumococcal Attachment to Primary Human Endothelial Cells Under Constant Media Flow
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2025
Source: Jagau, H. et al. Pneumococcus Infection of Primary Human Endothelial Cells in Constant Flow. J. Vis. Exp. (2019)This video demonstrates the real-time visualization of pneumococcal attachment to Von Willebrand Factor (VWF) strings on endothelial cells under constant media flow conditions. It outlines the steps for stimulating VWF release, labeling the strings, and quantifying bacterial binding.
06:05
Using the Overlay Assay to Qualitatively Measure Bacterial Production of and Sensitivity to Pneumococcal Bacteriocins
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Cited by 16 •
2014
Competition in Streptococcus pneumoniae is mediated by bacteriocins, small antimicrobial peptides with inhibitory activity towards pneumococcus and other related species. Here we describe an optimized bacterial overlay assay that allows for the characterization of bacteriocin activity and inhibitory spectrum, bacteriocin-specific immunity, and detection of secreted quorum sensing peptides.
FAQs
The capsule provides a focused way to examine a pneumococcal feature linked to immune evasion. In immunology and infection experiments, investigators can compare how defined isolates relate to host responses during pneumococcal infection. This makes capsule-associated differences useful for studying interactions between bacterial surface properties and immune defense, without treating all isolates as biologically identical.
Serotype determination gives an isolate a defined classification that can be compared across samples and studies. The result supports vaccine evaluation by identifying the serotype represented in experimental or clinical material. It also helps researchers interpret findings in relation to capsule-associated immune evasion and assess whether different pneumococcal isolates should be considered separately.
Optochin susceptibility and bile solubility add complementary evidence to culture-based identification. Alpha-hemolytic growth provides an initial culture characteristic, while these tests contribute additional laboratory distinctions. Molecular or biochemical analysis can supply further support when needed. Using several types of evidence makes identification less dependent on a single observed property of recovered material.
Antimicrobial susceptibility and virulence-related features describe different aspects of the same isolate. Susceptibility testing contributes information relevant to characterizing the organism, while virulence-related analysis supports investigation of properties associated with infection. Considering both broadens the isolate profile and can support diagnosis, surveillance, and host-pathogen studies.
Laboratories begin with a clinical specimen from which the organism is recovered. They then assess culture characteristics such as alpha-hemolytic growth and apply optochin susceptibility and bile solubility tests. Molecular or biochemical analysis can provide additional identification support. Once characterized, the isolate can be evaluated for serotype, antimicrobial susceptibility, and virulence-related features.
Researchers use pneumococcal isolates as experimentally defined material when they need a characterized bacterial input for immunology and infection experiments. Such material supports examination of host-pathogen interactions and immune responses to pneumococcal infection. Because the isolate can also be described by serotype and virulence-related features, studies can connect observed responses with properties of the bacterial strain.
Beyond individual diagnosis, characterized isolates contribute to epidemiological surveillance and vaccine evaluation. Surveillance uses the laboratory-defined properties of recovered strains as a basis for comparing pneumococcal material across investigations, while vaccine studies can examine the serotypes represented. Together, these applications extend isolate work from a single specimen to broader questions about infection patterns and prevention.