biology

Infectious bronchitis virus

Infectious bronchitis virus 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 Infectious bronchitis virus rather than just read about it. In short: Infectious bronchitis virus (IBV) is a species of virus from the genus Gammacoronavirus that infects birds. It causes avian infectious bronchitis, a highly infectious disease that affects the respiratory tract, gut, kidney and reproductive system.

Key takeaways

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

Reference excerpt

Infectious bronchitis virus (IBV) is a species of virus from the genus Gammacoronavirus that infects birds. It causes avian infectious bronchitis, a highly infectious disease that affects the respiratory tract, gut, kidney and reproductive system. IBV affects the performance of both meat-producing and egg-producing chickens and is responsible for substantial economic loss within the poultry industry.

Classification IBV is in the genus Gammacoronavirus, or group 3, with a non-segmented, positive-sense single-stranded RNA genome. It was previously the type species of its genus Igacovirus. When there was only one genus of coronaviruses, the genus Coronavirus, it was the type species of the group of all known coronaviruses.

Recombination When two strains of coronavirus IBV infect a host they may recombine during genome replication. Recombination appears to contribute to the genetic variation of the IBV genome found in nature.

Pathology

Respiratory system When inhaled, virus will attach to glycoprotein receptors containing sialic acid on ciliated epithelial cells of the respiratory epithelium. The respiratory replication will result in loss of ciliary activity, mucus accumulation, necrosis and desquamation, causing respiratory distress, râles and asphyxia. Local virus replication will result in viremia, spreading the infection into other tissues and organs. Other respiratory diseases of chickens (Mycoplasma gallisepticum, avian infectious laryngotracheitis (Gallid alphaherpesvirus 1), Newcastle disease (avian paramyxovirus 1), Avian metapneumovirus infection may be confused clinically to infectious bronchitis.

Kidney Through viremia, some nephrotropic strains (most of high virulence) could infect the kidney epithelium in tubules and nephron, causing kidney failure. At gross examination, kidneys may appear swollen and pale in color and with urates in ureters

Reproductive system In hens, the viremic IBV will also reach the oviduct, causing lesions in the magnum (the egg-white gland) and in the uterus (the egg-shell gland), leading to a sharp decline of egg production, shell-less, fragile or roughened shells eggs (uterus lesion) with watery whites (magnum lesion). Infection of chickens at puberty, during the oviduct development, will impede oviduct formation and destroy future laying capacity, resulting in "false layers". However, other diseases affecting layer chickens could lead to that condition.

Vaccines There are both attenuated vaccines and inactivated vaccines available. Their effectiveness is diminished by poor cross-protection. The nature of the protective immune response to IBV is poorly understood, but the surface spike protein, the amino-terminal S1 half, is sufficient to induce good protective immunity. Experimental vector IB vaccines and genetically manipulated IBVs—with heterologous spike protein genes—have produced promising results, including in the context of in ovo vaccination.

See also Infectious bronchitis virus D-RNA Veterinary virology

References

Further reading Gomaa, M.H.; Barta, J.R.; Ojkic, D.; Yoo, D. (2008). "Complete genomic sequence of turkey coronavirus". Virus Research. 135 (2): 237–246. doi:10.1016/j.virusres.2008.03.020. PMC 7114504. PMID 18468711.

Illustrations

Worked examples

Example 1 — a first encounter with Infectious bronchitis virus

Start with the simplest possible case. Write down what Infectious bronchitis virus 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 Infectious bronchitis virus 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 Infectious bronchitis virus 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 Infectious bronchitis virus

In research: Infectious bronchitis virus 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 Infectious bronchitis virus 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: Infectious bronchitis virus is common in secondary-school and first-year university syllabi. It links to neighbouring topics Animal viral diseases, Gammacoronaviruses, Poultry diseases, so understanding it makes those chapters shorter.
In everyday life: Look for Infectious bronchitis virus 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 Infectious bronchitis virus in 20 minutes

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

Frequently asked questions

What is Infectious bronchitis virus in simple terms?

Why does Infectious bronchitis virus 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 Infectious bronchitis virus?

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 Infectious bronchitis virus.