Immunology: Haptens and Toxoids
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Questions and Answers

What is the primary mechanism of passive immunisation?

  • Induction of long-lived immunity
  • Artificial manipulation of the immune response
  • Stimulation of the recipient's immune system
  • Transfer of antibodies directed at specific infective agents (correct)
  • Live attenuated vaccines require an adjuvant to enhance immune response.

    False

    What is the main difference between passive and active immunisation?

    Passive immunisation provides immediate protection through antibody transfer, while active immunisation stimulates the individual's immune response to provide long-term protection.

    Adjuvants are often adsorbed onto ______________________ to enhance their effectiveness.

    <p>aluminium hydroxide or a carrier protein</p> Signup and view all the answers

    Which type of vaccine is made by recombinant DNA technology?

    <p>Inactivated vaccine</p> Signup and view all the answers

    Tetanus antitoxin is an example of active immunisation.

    <p>False</p> Signup and view all the answers

    Match the following types of vaccines with their characteristics:

    <p>Live attenuated vaccine = Induces excellent immunity with durable protection Inactivated vaccine = Requires an adjuvant to enhance immune response Toxoid vaccine = Made from inactivated toxins Subunit vaccine = Made from protein components of an organism</p> Signup and view all the answers

    What is the role of adjuvants in vaccine development?

    <p>Adjuvants enhance antigen-specific immune responses when used in combination with specific vaccine antigens.</p> Signup and view all the answers

    What is immunisation according to the World Health Organisation?

    <p>The process of making a person immune or resistant to an infectious disease</p> Signup and view all the answers

    Natural immunisation occurs through natural infection or maternal antibodies.

    <p>True</p> Signup and view all the answers

    What is the difference between active and passive immunisation?

    <p>Active immunisation occurs when the body produces its own antibodies, while passive immunisation occurs when antibodies are administered from outside the body.</p> Signup and view all the answers

    A _______________ is a substance that enhances the immune response to a vaccine.

    <p>adjuvant</p> Signup and view all the answers

    What is the purpose of an adjuvant in a vaccine?

    <p>To enhance the immune response</p> Signup and view all the answers

    All vaccines are administered through injection.

    <p>False</p> Signup and view all the answers

    Corticosteroids are a type of _______________ medication.

    <p>non-steroidal</p> Signup and view all the answers

    Why should live attenuated vaccines be avoided in pregnant women?

    <p>Because of potential harm to the fetus</p> Signup and view all the answers

    Inactivated vaccines can infect the fetus.

    <p>False</p> Signup and view all the answers

    What is the general rule for administering immunoglobulin after vaccination with live vaccine?

    <p>Wait 2 weeks after vaccination with live vaccine before administering immunoglobulin.</p> Signup and view all the answers

    In the presence of severe _______________ immunodeficiency, oral polio vaccine (live attenuated) should not be used.

    <p>humoral</p> Signup and view all the answers

    What is a contraindication for vaccines containing neomycin?

    <p>History of systemic hypersensitivity</p> Signup and view all the answers

    Vaccination should be postponed in patients with mild infections.

    <p>False</p> Signup and view all the answers

    Match the following vaccines with their recommended use in immunosuppressed individuals:

    <p>Inactivated vaccines = Generally safe BCG = Not recommended for asymptomatic HIV-infected children Oral polio vaccine (live attenuated) = Can be used in presence of deficient cellular immunity Varicella vaccine = Can be used in presence of isolated B-cell deficiency</p> Signup and view all the answers

    When administering multiple vaccines, it is important to:

    <p>Administer different injectable vaccines at different injection sites</p> Signup and view all the answers

    In the case of thrombocytopenia or bleeding disorders, vaccines should be administered intramuscularly.

    <p>False</p> Signup and view all the answers

    What is the primary function of prostaglandins in wound healing?

    <p>Promotes inflammation (including pain and fever)</p> Signup and view all the answers

    In the case of a history of _________, vaccination is contraindicated.

    <p>anaphylaxis</p> Signup and view all the answers

    What is a potential side effect of vaccination?

    <p>All of the above</p> Signup and view all the answers

    Vaccines are 100% effective in protecting all recipients.

    <p>False</p> Signup and view all the answers

    Match the following conditions with their corresponding vaccination considerations:

    <p>Thrombocytopenia = Administer subcutaneously History of anaphylaxis = Contraindication to vaccination</p> Signup and view all the answers

    Prostaglandin production is facilitated by _______________________ enzymes.

    <p>cyclooxygenase (COX-1 and COX-2)</p> Signup and view all the answers

    What is a hapten?

    <p>A molecule that is too small to be immunogenic on its own</p> Signup and view all the answers

    Toxoid vaccines are made from weakened viruses.

    <p>False</p> Signup and view all the answers

    What is the purpose of inactivating or suppressing the toxicity of a bacterial toxin to create a toxoid?

    <p>To mount an immune response and form immunological memory without resulting in toxin-induced illness</p> Signup and view all the answers

    The measles vaccine is an example of a __________ vaccine.

    <p>live attenuated</p> Signup and view all the answers

    Match the following vaccine types with their characteristics:

    <p>Live attenuated = Uses a weakened form of the virus Inactivated = Uses a killed or inactivated virus or bacteria Toxoid = Uses a bacterial toxin that has been inactivated or suppressed Subunit = Uses only a small portion of the virus or bacteria</p> Signup and view all the answers

    Which of the following is an example of a next generation vaccine?

    <p>Pfizer-BioNTech mRNA vaccine</p> Signup and view all the answers

    All vaccines use adjuvants to enhance their immunogenicity.

    <p>False</p> Signup and view all the answers

    What is the difference between a vaccine and a toxoid?

    <p>A vaccine is a preparation of killed or attenuated microorganisms, while a toxoid is a bacterial toxin that has been inactivated or suppressed</p> Signup and view all the answers

    Study Notes

    Immunisation

    • Immunisation is the process of making a person immune or resistant to an infectious disease.
    • Types of immunisation:
      • Passive: transfer of antibody directed at a specific infective agent, recipient's immune system is not stimulated, acts immediately, and is short-lived.
      • Active: results from stimulation of a person's own immune response, considerable delay before protection, and immunity is long-lived.

    Vaccine Types

    • Live attenuated vaccine: natural live organisms manipulated to be harmless, but still viable, inducing excellent immunity with durable protection.
    • Inactivated vaccine: organism or parts of organism capable of eliciting an immune response, but not capable of causing infection, may require an adjuvant.
    • Toxoid: bacterial toxin with suppressed toxicity, but maintained immunogenicity, used for vaccination.

    Hapten

    • A small molecule that is not immunogenic on its own, but becomes immunogenic when conjugated to a carrier protein.

    Vaccine Examples

    • Live attenuated: smallpox, measles, mumps, rubella, varicella, BCG, polio (oral).
    • Inactivated: pertussis, cholera, hepatitis A, B, haemophilus influenzae, influenza, polio (parenteral), meningococcal, pneumococcal.
    • Toxoid: diphtheria, tetanus.

    Next Generation Vaccines (COVID-19)

    • Protein subunit vaccine
    • Messenger RNA (mRNA) vaccine
    • Vector vaccine

    Special Points to Consider

    • Immunisation and medication
    • Pregnancy: live attenuated vaccines should not be administered, woman immunised with live attenuated vaccine should not become pregnant within 4 weeks.
    • Immunoglobulin or blood products: prevent fully effective immunisation for at least 3 months.
    • Febrile illness: postpone vaccination in acutely ill, severely febrile patients.
    • Traces of antibiotics: found in some vaccines, history of systemic hypersensitivity is a contraindication.
    • Immunosuppression: inactivated vaccines are generally safe, but asymptomatic HIV-infected children should be routinely immunised.
    • Concurrent administration: no evidence to suggest safety and efficacy problems when multiple antigens are administered simultaneously.
    • Bleeding disorders: vaccine should be administered subcutaneously or intramuscularly with caution.
    • Biological variation: vaccines are biological substances and will elicit different responses in different people.

    Contraindications to Vaccination

    • History of serious reaction, encephalopathy, Guillain-Barré syndrome, or temperature ≥ 40.5°C within 48 hours of vaccination.
    • Collapse or shock-like state within 48 hours of vaccination.
    • Persistent, inconsolable crying lasting > 3 hours, occurring 2 weeks after vaccination.

    Prostaglandin and Inflammation

    • Prostaglandin production is facilitated by cyclooxygenase enzymes (COX-1 and COX-2).
    • Functions of prostaglandin:
      • Necessary for wound healing.
      • Promotes inflammation (including pain and fever).
      • Plays a role in platelet activation.
      • Protects the stomach lining from stomach acid.

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    Description

    Learn about haptens, small molecules that trigger an immune response when bound to a carrier protein, and toxoids, inactivated bacterial toxins used in immunization.

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