Vaccine Types and Efficacy Overview
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Questions and Answers

What is the primary goal of using adjuvants in vaccines?

  • To prolong the duration of immunity
  • To induce a generalized immune response
  • To activate only necessary elements for protection (correct)
  • To suppress the immune response entirely
  • Which adjuvant is most commonly used in human vaccines?

  • Freund’s adjuvant
  • Lipid emulsions
  • Heat labile E
  • Aluminum potassium sulfate (correct)
  • What form of immunological response is primarily induced by microbial PAMPs?

  • Th2 response
  • Th1 response (correct)
  • Humoral immunity
  • Secondary immune response
  • Which type of emulsions are used to form Water-in-Oil-in-Water systems?

    <p>Aqueous droplets within an oil phase (B)</p> Signup and view all the answers

    What type of adjuvant formulation primarily uses oil-in-water emulsions?

    <p>MF59 (A)</p> Signup and view all the answers

    What is the primary purpose of herd immunity?

    <p>To protect individuals who cannot be vaccinated (B)</p> Signup and view all the answers

    What is the basic reproduction number ($R_0$) for measles?

    <p>12-18 (D)</p> Signup and view all the answers

    Which vaccine-preventable disease has the highest herd immunity threshold?

    <p>Measles (C)</p> Signup and view all the answers

    Which phase of vaccine trials primarily focuses on assessing the optimal dose and route of administration?

    <p>Phase I (C)</p> Signup and view all the answers

    What is a characteristic feature of active immunity?

    <p>It results from direct exposure to pathogens (B)</p> Signup and view all the answers

    Which regulatory body oversees the safety and efficacy of human vaccines in the United States?

    <p>Food and Drug Administration (FDA) (B)</p> Signup and view all the answers

    What is the herd immunity threshold for polio?

    <p>80-86% (D)</p> Signup and view all the answers

    Which system collects data on adverse events following vaccination in the United States?

    <p>Vaccine Adverse Events Reporting System (VAERS) (C)</p> Signup and view all the answers

    What is a significant reason for the re-emergence of certain infectious diseases?

    <p>Laxity in vaccination program adherence (A)</p> Signup and view all the answers

    What is the role of PAMPS in vaccine efficacy?

    <p>They activate the immune system through TLR interactions. (B)</p> Signup and view all the answers

    Which of the following best describes herd immunity?

    <p>Protection provided to non-vaccinated individuals through community immunity. (C)</p> Signup and view all the answers

    Why is a malaria vaccine challenging to develop?

    <p>Too many potential vaccine targets exist. (B)</p> Signup and view all the answers

    What is the typical efficacy range for most vaccines?

    <p>80-95% (A)</p> Signup and view all the answers

    Which factor contributes to the re-emergence of infectious diseases?

    <p>Improper antibiotic use (B)</p> Signup and view all the answers

    What characteristic of epitopes is crucial for effective vaccine design?

    <p>They should be repetitive in nature (C)</p> Signup and view all the answers

    Why is creating a malaria vaccine particularly challenging?

    <p>The malaria parasite has a complex life cycle (B)</p> Signup and view all the answers

    How does herd immunity protect individuals who are not immunized?

    <p>By limiting the spread of the disease within the community (D)</p> Signup and view all the answers

    Which vaccination failure contributed to outbreaks of whooping cough in the United States?

    <p>Laxity in vaccination program adherence (B)</p> Signup and view all the answers

    What term describes herd immunity specifically within a household?

    <p>Cocooning (A)</p> Signup and view all the answers

    Which disease has the lowest herd immunity threshold among the listed vaccine-preventable diseases?

    <p>Mumps (B)</p> Signup and view all the answers

    During which phase of vaccine trials is the efficacy assessed with larger populations?

    <p>Phase II (B)</p> Signup and view all the answers

    Which organization is responsible for collecting data on adverse events related to vaccinations in the United States?

    <p>Centers for Disease Control and Prevention (B)</p> Signup and view all the answers

    What does the basic reproduction number ($R_0$) for COVID-19 indicate?

    <p>It has a potential spread of 1-6 individuals. (D)</p> Signup and view all the answers

    What is a major safety concern associated with DNA vaccines?

    <p>Integration into the host cell genome (D)</p> Signup and view all the answers

    What is a notable advantage of DNA vaccines over mRNA vaccines?

    <p>Lower production costs and scalability (B)</p> Signup and view all the answers

    Which of the following describes the primary function of adjuvants in vaccines?

    <p>To enhance immune responses to antigens (D)</p> Signup and view all the answers

    What characteristic makes mRNA vaccines particularly challenging for storage compared to DNA vaccines?

    <p>They are extremely unstable and require very low temperatures (D)</p> Signup and view all the answers

    What dual strategy does the 'perfect' adjuvant aim to achieve?

    <p>Stabilize antigen presence and induce innate immunity (D)</p> Signup and view all the answers

    What is a notable disadvantage of modified-live vaccines?

    <p>There is a risk of reversion to virulence. (D)</p> Signup and view all the answers

    Which type of vaccine is characterized by using a dead, non-replicating target?

    <p>Inactivated vaccines (B)</p> Signup and view all the answers

    What is a common characteristic of inactivated vaccines compared to live vaccines?

    <p>They have a lower risk of causing infection. (A)</p> Signup and view all the answers

    What is a key concern with the use of toxoid vaccines?

    <p>They can lead to hypersensitivity reactions. (A)</p> Signup and view all the answers

    Which statement best describes the target population of subunit vaccines?

    <p>They utilize proteins purified from wild-type organisms or those expressed in vitro. (C)</p> Signup and view all the answers

    Flashcards

    Herd Immunity

    Community immunity; a concept where a high percentage of a population is immune to a disease, protecting those who can't be immunized.

    Basic Reproduction Number (R0)

    The average number of people one infected person will infect.

    Herd Immunity Threshold

    The percentage of a population that needs immunity to prevent a disease outbreak.

    Vaccine Phases

    Stages of testing a vaccine, from small to large trials, followed by real-world monitoring of vaccine safety and efficacy once licensed.

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    Vaccine Efficacy

    How well a vaccine prevents a disease.

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    Vaccine Safety

    How little adverse events a vaccine potentially causes.

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    Veterinary Vaccine Regulation

    Standards and approval process by the Center for Veterinary Biologics for animal vaccines.

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    Immune System Function

    The complex body system that recognizes and mounts a response to foreign substances such as antigens.

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    Adjuvant Role

    To activate only the necessary elements of the immune response for protection and avoid a generalized immune response, ensuring effective and safe immunity.

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    Aluminum Adjuvants

    Primarily used aluminum adjuvants, commonly found in veterinary and human vaccines, known for strong induction of Th2 responses.

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    Lipid/Oil Emulsions

    Emulsions of oil and water, acting as depots and inducers of MHC responses, particularly used in veterinary and increasingly in human vaccines.

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    Oil Based Adjuvants

    Different types of oil-based adjuvants used in veterinary vaccines, classified based on water and oil distribution: W/O, O/W, and W/O/W.

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    PRR and Other Ligands

    Microbial derivatives, like PAMPs, LPS, and CpG, act as ligands that engage pattern recognition receptors (PRRs) to activate the immune response.

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    Re-emerging Diseases

    Infectious diseases that were previously controlled but are now becoming more common again.

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    Factors Causing Re-emergence

    Reasons for the return of infectious diseases include combinations of infections, improper antibiotic use, and weakened vaccination programs.

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    Protective Epitopes

    Specific parts of antigens that trigger an immune response and provide protection against disease.

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    What Makes a Good Vaccine?

    Effective vaccines contain protective epitopes from protective antigens, are particulate, and have repetitive structures to activate the immune system effectively.

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    Why Re-emerge?

    Re-emerging diseases happen due to factors like combinations of infections, improper antibiotic use, and weakened vaccination programs.

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    Why No Malaria Vaccine?

    Developing a malaria vaccine is difficult because the parasite has many targets and rapidly evolves, making it hard to create a vaccine that works consistently.

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    Modified-Live Vaccine

    A type of vaccine that uses a weakened version of the pathogen to stimulate an immune response. The pathogen is modified to be less virulent but still able to replicate.

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    Live-Attenuated Vaccine

    A type of vaccine that uses a weakened version of the pathogen that can replicate but not cause disease, creating a strong immune response.

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    Inactivated (Killed) Vaccine

    A type of vaccine that uses a dead or inactive version of the pathogen, which can't replicate but still triggers an immune response.

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    Subunit Vaccine

    A vaccine that uses only specific parts (subunits) of the pathogen, like proteins or antigens, to trigger an immune response.

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    Toxoid Vaccine

    A vaccine that uses inactivated toxins produced by the pathogen, to trigger an immune response.

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    Recombinant Virus Vaccines

    Vaccines using weakened or harmless viruses to deliver specific antigen proteins into the body's immune system, triggering an immune response.

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    DNA Vaccines

    Vaccines containing genetic material (DNA) encoding an antigen, which instructs cells to produce the antigen, eliciting an immune response.

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    mRNA Vaccines

    Vaccines utilizing messenger RNA (mRNA) encoding an antigen, directing cells to produce the antigen and stimulate an immune response.

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    Adjuvant

    A substance added to a vaccine to enhance the immune response to the vaccine antigen, helping trigger a stronger and more effective immune response.

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    Why are adjuvants used?

    Adjuvants are used to enhance the immune response to vaccine antigens, particularly for those that are poorly immunogenic, leading to more effective and long-lasting protection.

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    Study Notes

    Vaccine Types and Approaches

    • Vaccines target specific parts of the pathogen to limit or stop infection.
    • All vaccines must target the right part of the agent.

    How Science Works vs. How Google Works

    • The image shows a contrast between how science and Google operate.
    • Science progresses through a structured system, while Google operates in a different data-driven method.

    Efficacy

    • Most vaccines are effective in 80-95% of immunized individuals.
    • Vaccines contain protective epitopes (parts of antigens).
    • These are typically 20-200 nm in size and enter the lymphatic system.
    • These particles are taken up by antigen-presenting cells (APCs) and engage with B cells.
    • These components are repetitive in nature and stimulate a cellular immune response.
    • Pathogen-associated molecular patterns (PAMPs) are present, allowing Toll-like receptors (TLRs) to activate the immune system.

    Prophylactic Vaccines

    • Protect against diseases, not infection.
    • Vaccines are a good defense against disease.
    • Vaccination is safe.
    • Adverse reactions are usually less severe than the disease itself.

    Immune System Response to Invaders

    • The humoral immune system is involved.
    • The cellular immune system plays a key role involving neutrophils, macrophages, killer cells, natural killer cells, helper T cells, and cytotoxic T cells.

    Vaccinations - Active vs. Passive

    • Active vaccines allow the body to produce its own immune response with antibodies and memory.
    • Examples include Moderna, Pfizer, and J&J COVID vaccines.
    • Passive vaccines administer pre-formed antibodies or monoclonal antibodies.
    • Examples include Regeneron's antibodies, Gilead's remdesivir, dexamethasone.

    Herd Immunity

    • A sufficient portion of a population is immune to an infectious disease, making the spread from person to person unlikely.
    • Also known as community immunity.
    • Herd immunity protects even unvaccinated people.
    • Synonyms include community immunity, and coverage.
    • Cocooning refers to achieving herd immunity within a household.

    Emerging and Re-emerging Infectious Diseases

    • Emerging diseases are new and not previously observed.
    • Examples include HIV.
    • Re-emerging diseases are old diseases returning.
    • Examples include tuberculosis (TB) in the U.S.
    • Factors include globalization, interactions between people and wildlife.
    • Re-emergence can be due to lapses in hygiene or vaccinations or improper use of antibiotics.

    Traditional Vaccines

    • Live vaccines (live attenuated or heterologous) use a weakened form of the germ.
    • Killed vaccines use inactivated pathogens.
    • Subunit vaccines use antigenic parts of the pathogen.
    • Toxoid vaccines use inactivated toxins.
    • Recombinant DNA vaccines use genetic engineering.

    Modified Live Vaccines

    • These vaccines use live pathogens but weakened to avoid harm to the host.
    • The methods may involve mutation, chemical treatment, and temperature sensitivity.

    Inactivated (Killed) Vaccines

    • They use a dead pathogen, but still present immunity.
    • Method involves inactivation via physical or chemical treatment.

    Subunit Vaccines

    • These vaccines use pure proteins or other parts of a pathogen to stimulate an immune response.
    • These parts can be cloned, synthesized, or extracted from the original pathogen.
    • Vaccines use components to stimulate an immune response.

    Recombinant Virus Vaccines

    • These vaccines use a live vector (like the vaccinia virus).
    • The process involves inserting pathogen genes into a safe virus vector.
    • This "injects" the antigen into the host to produce an immune response.

    DNA Vaccines

    • These vaccines use genetic material (DNA) to carry a piece of the pathogen's DNA.
    • This DNA produces an antigen or protein that triggers an immune response.

    DNA Vaccine Plasmids

    • These plasmids contain a eukaryotic promoter region, an antibiotic resistance gene (for selection of suitable cells used in the process), and intron region and the gene that codes for the antigen of interest to the immune system.

    Why DNA Vaccination

    • Inexpensive production.
    • Thermostable (able to be lyophilized)
    • Marker vaccines to measure surveillance and control measures.

    DNA Vaccine Safety Issues

    • Integration into the host genome and potential tumor induction.
    • Induction of autoantibodies.
    • Induction of tolerance.

    Adjuvants

    • These are agents added to a vaccine to enhance the production of an immune response.
    • Used for over 80 years.
    • The technologies are improving constantly.
    • Recombinant proteins or peptides sometimes are poorly immunogenic without an adjuvant.

    Different Adjuvants – Different Strategies

    • Delivery: Carriers stabilize the vaccine antigen presence over time.
    • Immune Potentiator: Creates direct stimulatory effects on immune cells, initiating an immune response through innate immune activation.

    The "Perfect" Adjuvant

    • Delivers both antigen to immune cells, and directly activates them.
    • The goal is a strong and safe response.
    • Effective, and safe are needed.

    Alums

    • Primarily aluminum adjuvants.
    • Extensive use in veterinary vaccines.
    • Commonly used in human vaccines.
    • Strong Th2 response inducer.
    • Examples include aluminum hydroxide and aluminum potassium sulfate (Alum).
    • Used in toxoid formulations like the Clostridial vaccines.

    Lipid/Oil Emulsions

    • Detergent-stabilized oil and water emulsions.
    • Precise mode of action isn't entirely understood.
    • Used in animal vaccinations.
    • Gaining more use in human vaccines.

    Oil-Based Adjuvants

    • Water-in-oil, oil-in-water, or water-in-oil-in-water formulations.
    • Oil can be a good carrier of antigen, but some systems are better for prolonged localized effects.
    • Oil-based adjuvants help deliver antigens to the immune cells.

    W/O/W Adjuvant System

    • Illustrates the different components in a water-in-oil-in-water system.
    • Components include oil, antigens (proteins) of interest, and surfactant to stabilize the emulsion.

    PRR and Other Ligands

    • Patterns associated with microbes include PAMPs.
    • PAMPs trigger immune responses.
    • Microbe derived PAMPs induce adaptive immune responses through antigen presentation with the release of pro-inflammatory cytokines.

    Delivery Vehicles

    • Membrane-bound phospholipid vesicles,
    • ISCOMS (Immune Stimulating Complexes),
    • Liposomes,
    • Virosomes,
    • Viral-like particles.

    Vaccine Side Effects

    • Common side effects are pain at injection site, sneezing/congestion, fatigue.
    • Vaccine Adverse Event Reporting System (VAERS) monitors adverse reactions.
    • Various unsubstantiated urban legends exist.
    • MMR vaccine is not linked to autism.

    Future Vaccines

    • Potential to develop vaccines against various diseases including HIV, Ebola etc.
    • Also, future possibilities include therapeutic vaccines targeting cancers.
    • Autoimmune and allergy treatment are future possibilities.

    Vaccine Summary

    • Whole organism: uses whole pathogens.
    • Modified live: weakened but live pathogens.
    • Inactivated: dead pathogens.
    • Subunit: uses parts of the pathogen.
    • Recombinant live: inserts pathogen genes into vectors.
    • DNA: uses genetic material to produce an antigen.
    • Adjuvants: enhance immune response.
    • Vaccine usage and side effects.

    Types of Vaccines and their Pros and Cons

    • Tables outlining different vaccine types, their descriptions, pros, and cons.

    Next Lecture

    • Covers types of vaccines.
    • Explores the mechanisms of how vaccines work.

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    MICR439 Vaccination 2024 PDF

    Description

    Explore various vaccine types, their efficacy, and the immune responses they provoke. This quiz emphasizes the contrast between scientific methods and data-driven approaches like those used by Google. Get ready to test your knowledge on prophylactic vaccines and how they protect against diseases.

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