biology

Louping ill

Louping ill is a biology 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 Louping ill rather than just read about it. In short: Louping-ill () is an acute viral disease primarily of sheep that is characterized by a biphasic fever, depression, ataxia, muscular incoordination, tremors, posterior paralysis, coma, and death. Louping-ill is a tick-transmitted disease whose occurrence is closely related to the distribution of the primary vector, the sheep tick Ixodes ricinus.

Key takeaways

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

Reference excerpt

Louping-ill () is an acute viral disease primarily of sheep that is characterized by a biphasic fever, depression, ataxia, muscular incoordination, tremors, posterior paralysis, coma, and death. Louping-ill is a tick-transmitted disease whose occurrence is closely related to the distribution of the primary vector, the sheep tick Ixodes ricinus. It also causes disease in red grouse, and can affect humans. The name 'louping-ill' is derived from an old Scottish word describing the effect of the disease in sheep whereby they 'loup' or spring into the air.

Cause

Louping ill is caused by RNA virus called Louping ill virus. Louping ill virus belongs to genus Orthoflavivirus, family Flaviviridae.

Prevention According to a ProMED article, disease in sheep has been controlled in the UK by a vaccine (ATCvet code: QI04AA01), originally developed by Scotland's Moredun Research Institute by Prof John Russell Greig. In 2009 a shortage of vaccine combined with an increase in the number of ticks found in sheep pasture areas cause an increased risk of this disease. The vaccine was withdrawn by its producer in 2017. In 2025, Moredun announced a crowd-funding campaign to develop a new vaccine; with the Scottish Government pledging to match funding up to £100,000 vaccine production was scaled-up to commercial levels.

Louping ill in humans Although predominantly a sheep disease, Louping ill infections have also been reported in humans, and hence is a zoonotic disease. The first reported human case of louping ill occurred in 1934. The clinical symptoms in humans include influenza-like illness (fever, headache, and muscle stiffness), biphasic encephalitis (initial flu-like symptoms followed by neurological signs such as severe headache, vomiting, and neck stiffness), poliomyelitis-like illness (paralysis ranging from mild to severe), and in rare cases hemorrhagic fever. Certain groups are at higher risk of infection due to occupational exposure. These include laboratory personnel working with the virus, farmers, shepherds, or butchers handling infected sheep or animal tissues, as well as individuals exposed to tick bites in endemic areas.

References

Committee on Foreign Animal Diseases of the United States Animal Health Association (1998), Foreign Animal Diseases, Pat Campbell & Assoc/Carter Printing Co., ISBN 0-08-615213-0, archived from the original on 2009-02-13 Louping ill (PDF), Center for Food Security and Public Health, College of Veterinary Medicine, Iowa State University, 2005-08-05

External links

Moredun Research Institute vaccine article WHO vaccine listing: QI04AA01 (WHO))

Illustrations

Worked examples

Example 1 — a first encounter with Louping ill

Start with the simplest possible case. Write down what Louping ill claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In biology, 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 Louping ill 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 Louping ill 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 Louping ill

In research: Louping ill appears in biology 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 Louping ill 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: Louping ill is common in secondary-school and first-year university syllabi. It links to neighbouring topics Animal viral diseases, Flaviviridae, Sheep and goat diseases, so understanding it makes those chapters shorter.
In everyday life: Look for Louping ill 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 Louping ill in 20 minutes

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

Frequently asked questions

What is Louping ill in simple terms?

Why does Louping ill matter?

Because it connects several biology 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 Louping ill?

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 Louping ill.