science

Schick test

Schick test 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 Schick test rather than just read about it. In short: The Schick test, developed in 1913, is a skin test used to determine whether or not a person is susceptible to diphtheria. It was named after its inventor, Béla Schick (1877–1967), a Hungarian-born American pediatrician.

Key takeaways

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

Reference excerpt

The Schick test, developed in 1913, is a skin test used to determine whether or not a person is susceptible to diphtheria. It was named after its inventor, Béla Schick (1877–1967), a Hungarian-born American pediatrician.

Procedure The test is a simple procedure. A small amount (0.1 ml) of diluted (1/50 MLD) diphtheria toxin is injected intradermally into one arm of the person and a heat inactivated toxin on the other as a control. If a person does not have enough antibodies to fight it off, the skin around the injection will become red and swollen, indicating a positive result. This swelling disappears after a few days. If the person has an immunity, then little or no swelling and redness will occur, indicating a negative result. Results can be interpreted as:

Positive: when the test results in a wheal of 5–10 mm diameter, reaching its peak in four to seven days. The control arm shows no reaction. This indicates that the subject lacks antibodies against the toxin and hence is susceptible to the disease. Pseudo-positive: when there is only a red-colored inflammation (erythema) and it disappears within four days. This happens on both the arms since the subject is immune but hypersensitive to the toxin. Negative reaction: Indicates that the person is immune. Combined reaction: Initial picture is like that of the pseudo-reaction but the erythema fades off after four days only in the control arm. It progresses on the test arm to a typical positive. The subject is interpreted to be both susceptible and hypersensitive. The test was created when immunizing agents were scarce and not very safe; however, as newer and safer toxoids became available, susceptibility tests were no longer required.

References

Taber's Cyclopedic Medical Dictionary, 20th Ed. (2005).

Illustrations

Worked examples

Example 1 — a first encounter with Schick test

Start with the simplest possible case. Write down what Schick test 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 Schick test 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 Schick test 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 Schick test

In research: Schick test 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 Schick test 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: Schick test is common in secondary-school and first-year university syllabi. It links to neighbouring topics Diphtheria, Immunologic tests, Pediatrics, so understanding it makes those chapters shorter.
In everyday life: Look for Schick test 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 Schick test in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Schick test 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 Schick test out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Schick test in simple terms?

Why does Schick test 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 Schick test?

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 Schick test.