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Ch. 12 - Adaptive Immunity
Norman-McKay- Microbiology: Basic and Clinical Principles 2nd Edition
Norman-McKay2nd EditionMicrobiology: Basic and Clinical PrinciplesISBN: 9780137661619Not the one you use?Change textbook
Chapter 12, Problem 2

In which of the following scenarios would administering immunoglobulins be useful? Select all that apply. (NCLEX/HESI/TEAS)
a. To neutralize a toxin
b. To aid a patient who is immune compromised
c. After venom exposure
d. To block IgM from crossing the placenta
e. To protect a premature infant from respiratory syncytial virus

Verified step by step guidance
1
Step 1: Understand what immunoglobulins are and their primary function. Immunoglobulins (antibodies) are proteins produced by the immune system that recognize and neutralize pathogens such as bacteria, viruses, and toxins.
Step 2: Analyze each scenario to determine if passive immunity via immunoglobulin administration would be beneficial. Passive immunity involves giving pre-formed antibodies to provide immediate protection or neutralization.
Step 3: For option (a) 'To neutralize a toxin' — immunoglobulins can bind to toxins and neutralize them, so administering immunoglobulins is useful here.
Step 4: For option (b) 'To aid a patient who is immune compromised' — immunoglobulins can provide passive immunity to patients who cannot mount an effective immune response, making this a valid use.
Step 5: For options (c) 'After venom exposure' and (e) 'To protect a premature infant from respiratory syncytial virus' — immunoglobulins specific to venom or RSV can be administered to neutralize venom or protect vulnerable infants, so these are also appropriate uses. Option (d) 'To block IgM from crossing the placenta' is not a typical use of immunoglobulins, as IgM does not cross the placenta significantly.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Passive Immunization with Immunoglobulins

Passive immunization involves administering pre-formed antibodies (immunoglobulins) to provide immediate but temporary protection against specific pathogens or toxins. It is useful in situations where rapid immunity is needed, such as toxin neutralization or post-exposure prophylaxis.
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Indications for Immunoglobulin Therapy

Immunoglobulin therapy is indicated for neutralizing toxins (e.g., tetanus), treating immune-compromised patients who cannot produce adequate antibodies, and providing protection after exposure to certain venoms or viruses. It is not used to block antibody transfer across the placenta.
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Limitations of Immunoglobulin Use

Immunoglobulins do not prevent the natural transfer of maternal IgG across the placenta and are not designed to block IgM. Their protection is temporary, and they do not replace active immunization or long-term immunity, especially in premature infants who may require additional interventions.
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