astronomy

Universal flu vaccine

Universal flu vaccine is a astronomy 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 Universal flu vaccine rather than just read about it. In short: A universal flu vaccine would be a flu vaccine effective against all human-adapted strains of influenza A and influenza B regardless of the virus sub type, or any antigenic drift or antigenic shift. Hence it should not require modification from year to year in order to keep up with changes in the influenza virus.

Key takeaways

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

Reference excerpt

A universal flu vaccine would be a flu vaccine effective against all human-adapted strains of influenza A and influenza B regardless of the virus sub type, or any antigenic drift or antigenic shift. Hence it should not require modification from year to year in order to keep up with changes in the influenza virus. As of 2024 no universal flu vaccine had been successfully developed, however several candidate vaccines were in development, with some undergoing early stage clinical trial.

Medical uses New vaccines against currently circulating influenza variants are required every year due to the diversity of flu viruses and variable efficacy of vaccines to prevent them. A universal vaccine would eliminate the need to create a vaccine for each year's variants. The efficacy of a vaccine refers to the protection against a broad variety of influenza strains. Events such as antigenic shift have created pandemic strains such as the H1N1 outbreak in 2009. The research required every year to isolate a potential popular viral strain and create a vaccine to defend against it is a six-month-long process; during that time the virus can mutate, making the vaccines less effective. If a universal vaccine can be developed which is both effective and safe, it could be manufactured in quantity and eliminate availability and supply issues of current vaccines. Centivax, a biotech company, has developed a universal flu vaccine candidate that has shown promise in preclinical studies. The vaccine aims to provide broad protection against various influenza strains by targeting conserved regions of the virus. The company has raised $45 million to advance the vaccine through clinical trials.

Influenza virus Human influenza is principally caused by the Influenza A and Influenza B viruses. Both have similar structure, being enveloped RNA virus. Their protein membrane contains the glycoproteins hemagglutinin (HA) and neuraminidase (NA) which are used by the virus to enter a host cell, and subsequently to release newly manufactured virions from the host cell. Each strain of the influenza virus has a different pattern of glycoproteins; the glycoproteins themselves have variability as well.

History

In 2008, Acambis announced work on a universal flu vaccine (ACAM-FLU-ATM) based on the less variable M2 protein component of the flu virus shell. See also H5N1 vaccines. In 2009, the Wistar Institute in Pennsylvania received a patent for using "a variety of peptides" in a flu vaccine, and announced it was seeking a corporate partner. In 2010, the National Institute of Allergy and Infectious Diseases (NIAID) of the U.S. NIH announced a breakthrough; the effort targets the stem, which mutates less often than the head of the viral HA. By 2010 some universal flu vaccines had started clinical trials.

BiondVax identified 9 conserved epitopes of the influenza virus and combined them into a recombinant protein called Multimeric-001. All seven of Biondvax's completed phase 2 human trials demonstrated safety and significant levels of immunogenicity; however in October 2020, results of the phase 3 study were published, indicating no apparent efficacy. ITS's fp01 includes 6 peptide antigens to highly conserved segments of the PA, PB1, PB2, NP & M1 proteins, and has started phase I trials. DNA vaccines, such as VGX-3400X (aimed at multiple H5N1 strains), contain DNA fragments (plasmids). Inovio's SynCon DNA vaccines include H5N1 and H1N1 subtypes. Other companies pursuing the vaccine as of 2009 and 2010 include Theraclone, VaxInnate, Crucell NV, Inovio Pharmaceuticals, Immune Targeting Systems (ITS) and iQur. In 2019, Distributed Bio completed pre-clinical trials of a vaccine that consists of computationally selected distant evolutionary variants of hemagglutinin epitopes and is expected to begin human trials in 2021. In recent years, research has concerned use of an antigen for the flu hemagglutinin (HA) stem. Based on the results of animal studies, a universal flu vaccine may use a two-step vaccination strategy: priming with a DNA-based HA vaccine, followed by a second dose with an inactivated, attenuated, or adenovirus-vector-based vaccine. Some people given a 2009 H1N1 flu vaccine have developed broadly protective antibodies, raising hopes for a universal flu vaccine. A vaccine based on the hemagglutinin (HA) stem was the first to induce "broadly neutralizing" antibodies to both HA-group 1 and HA-group 2 influenza in mice. In July 2011, researchers created an antibody, which targets a protein found on the surface of all influenza A viruses called haemagglutinin. FI6 is the only known antibody that binds (its neutralizing activity is controversial) to all 16 subtypes of the influenza A virus hemagglutinin and might be the lynchpin for a universal influenza vaccine. The subdomain of the hemagglutinin that is targeted by FI6, namely the stalk domain, was actually successfully used earlier as universal influenza virus vaccine by Peter Palese's research group at Mount Sinai School of Medicine. Other vaccines are polypeptide based.

… excerpt ends here. Continue reading the full article.

Illustrations

Worked examples

Example 1 — a first encounter with Universal flu vaccine

Start with the simplest possible case. Write down what Universal flu vaccine claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In astronomy, 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 Universal flu vaccine 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 Universal flu vaccine 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 Universal flu vaccine

In research: Universal flu vaccine appears in astronomy 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 Universal flu vaccine 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: Universal flu vaccine is common in secondary-school and first-year university syllabi. It links to neighbouring topics Drug discovery, Influenza vaccines, so understanding it makes those chapters shorter.
In everyday life: Look for Universal flu vaccine 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 Universal flu vaccine in 20 minutes

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

Frequently asked questions

What is Universal flu vaccine in simple terms?

Why does Universal flu vaccine matter?

Because it connects several astronomy 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 Universal flu vaccine?

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 Universal flu vaccine.