science

Kauffmann–White classification

Kauffmann–White classification is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Kauffmann–White classification rather than just read about it. In short: The Kauffmann–White classification or Kauffmann and White classification scheme is a system that classifies the genus Salmonella into serotypes, based on surface antigens. It is named after Philip Bruce White and Fritz Kauffmann.

Key takeaways

Kauffmann–White classification belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Kauffmann–White classification to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Kauffmann–White classification from memory before moving on to harder problems.

Reference excerpt

The Kauffmann–White classification or Kauffmann and White classification scheme is a system that classifies the genus Salmonella into serotypes, based on surface antigens. It is named after Philip Bruce White and Fritz Kauffmann. First the "O" antigen type is determined based on oligosaccharides associated with lipopolysaccharide. Then the "H" antigen is determined based on flagellar proteins (H is short for the German Hauch meaning "breath" or "mist"; O stands for German ohne meaning "without"). Since Salmonella typically exhibit phase variation between two motile phenotypes, different "H" antigens may be expressed. Salmonella that can express only one "H" antigen phase consequently have motile and non-motile phenotypes and are termed monophasic, whilst isolates that lack any "H" antigen expression are termed non-motile. Pathogenic strains of Salmonella Typhi, Salmonella Paratyphi C, and Salmonella Dublin carry the capsular "Vi" antigen (Vi for virulence), which is a special subtype of the capsule's K antigen (from the German word Kapsel meaning capsule). In 2007, the WHO Collaborating Centre for Reference and Research on Salmonella (WHOCC-Salm), which maintains and updates the classification scheme, and is based in France, proposed that it be renamed the White–Kauffmann–Le Minor scheme, to honor the work of Léon Le Minor, who described most of serovars known at the time.

Kauffmann–White classification for Salmonella Salmonella (species) serotype (O antigen) : (H1 antigen) : (H2 antigen) Examples

Salmonella enterica serotype Typhimurium 1,4,5,12:i:1,2 monophasic variant of Salmonella Typhimurium 1,4,5,12:i:-

Antigens in brackets are those that are rarely expressed in that serovar.

Representative stock of antisera The cost of maintaining a full set of antisera precludes all but reference laboratories from performing a complete serological identification of salmonella isolates. Most laboratories stock only a limited range of antisera, and the choice of stock sera is largely determined by the nature of the specimens to be processed. A common set of working antisera is shown below:

Laboratories that are likely to investigate typhoid also carry antiserum raised against the Vi antigen. A set of "Rapid Diagnostic Sera" is also held and is used for determination of common specific H-antigens except i-H. After obtaining a positive agglutination with the polyvalent-H specific and non-specific antiserum, the three RDS antisera are used to identify the H antigen present. Depending on the pattern of positive and negative reactions with the RDS antisera, the specific H antigen may be identified:

E = polyvalent for eh, enx, etc. G = polyvalent for gm, gp, etc. L = polyvalent for lv, lw, etc.

Nonserological correlates Instead of antibody-based serotyping, modern laborotories increasingly use DNA-based methods such as pulsed field gel electrophoresis, multiple-loci VNTR analysis, multilocus sequence typing, and multiplex-PCR. These "molecular serotyping" systems actually perform genotyping of the genes that determine surface antigens. They largely agree with the Kauffman-White results, allowing the system to continue to be used.

Connection of O and H symbols to the work of Weil and Felix

This use of the O and H symbols is based on the historic observations of Edmund Weil (1879–1922) and Arthur Felix (1887–1956) of a thin surface film produced by agar-grown flagellated Proteus strains, a film that resembled the mist produced by breath on a glass. Flagellated (swarming, motile) variants were therefore designated H forms (German Hauch, for film, literally breath or mist); nonflagellated (nonswarming, nonmotile) variants growing as isolated colonies and lacking the surface film were designated as O forms (German ohne Hauch, without film [i.e., without surface film of mist droplets]).

References

Worked examples

Example 1 — a first encounter with Kauffmann–White classification

Start with the simplest possible case. Write down what Kauffmann–White classification claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Kauffmann–White classification before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Kauffmann–White classification ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Kauffmann–White classification

In research: Kauffmann–White classification appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Kauffmann–White classification in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Kauffmann–White classification is common in secondary-school and first-year university syllabi. It links to neighbouring topics Bacteriology, so understanding it makes those chapters shorter.
In everyday life: Look for Kauffmann–White classification outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Kauffmann–White classification in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Kauffmann–White classification means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Kauffmann–White classification out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Kauffmann–White classification in simple terms?

Why does Kauffmann–White classification matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Kauffmann–White classification?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Kauffmann–White classification.