A parent asks the nurse what to give their 8-year-old child with chicken pox to relieve fever and aches.
The nurse provides fever relief education to the parent with an emphasis on avoiding which of these?

Choice A rationale

Immunoglobulin A (IgA) is the predominant antibody found in mucosal secretions like saliva, tears, breast milk, and gastrointestinal fluid, providing local mucosal immunity against ingested or inhaled pathogens. While vital for defense, IgA does not typically trigger the systemic mast cell degranulation and massive mediator release characteristic of anaphylaxis.

Choice B rationale

Immunoglobulin E (IgE) is the antibody that mediates Type I hypersensitivity reactions, including anaphylaxis. IgE is bound to the surface of mast cells and basophils. Upon re-exposure to a specific antigen (allergen), cross-linking of these IgE molecules triggers a massive, rapid release of pre-formed mediators, such as histamine and leukotrienes, causing the severe, systemic symptoms like profound vasodilation and bronchoconstriction.

Choice C rationale

Immunoglobulin G (IgG) is the most abundant antibody in plasma, providing long-term humoral immunity and crossing the placenta to confer passive immunity to a fetus. It is a primary mediator of Type II and Type III hypersensitivity reactions. Although it can activate the complement cascade, IgG does not play the principal role in the immediate, IgE-driven pathogenesis of anaphylaxis.

Choice D rationale

Immunoglobulin M (IgM) is the largest antibody, often existing as a pentamer, and is the first antibody produced during a primary immune response, primarily located in the blood and lymph fluid. It is highly effective at activating the complement system and agglutination but is not the specific key mediator responsible for initiating the rapid mast cell degranulation that defines anaphylaxis.

Choice A rationale

Hyperplasia is defined as an increase in the number of cells in a tissue or organ. For example, the proliferation of glandular cells in the female breast during pregnancy. This differs from the described change where one cell type (ciliated columnar) is replaced by a different, more resilient cell type (squamous), without necessarily increasing cell number.

Choice B rationale

Anaplasia describes the loss of cellular differentiation, a hallmark of malignancy where cells revert to a more primitive, undifferentiated state. The resulting cells exhibit marked pleomorphism (variation in size/shape) and high mitotic activity, which is a far more severe and characteristic change than the adaptive cell substitution seen in the lung's lining.

Choice C rationale

Dysplasia involves deranged cellular growth, resulting in cells that vary in size, shape, and organization, and often signifies a pre-cancerous condition. The change in the smoker's lung (columnar to squamous) is typically a protective response, called metaplasia, which may progress to dysplasia but is not dysplasia itself initially.

Choice D rationale

Metaplasia is an adaptive reversible change where one differentiated adult cell type (in this case, ciliated columnar epithelium) is replaced by another differentiated adult cell type (stratified squamous epithelium). This is a protective response to chronic irritation, such as cigarette smoke, as the squamous cells are more robust, though they sacrifice the important function of mucous clearance.