Chapter 18: Vaccines & Sera

The text first differentiates between two types of acquired resistance: active immunity, achieved when the body recognizes a foreign antigen (such as through infection or vaccination) and forms long-lasting memory cells and antibodies, and passive immunity, which is temporary and achieved by injecting preformed antibodies from human or animal sources (immune sera). Vaccines, which stimulate active immunity by introducing weakened or altered protein antigens (including toxoids), are crucial for routine preventive care across the lifespan, including mandated schedules for children, annual influenza shots for all adults, and specific boosters like tetanus every ten years. Special attention is given to newer vaccines like the Human Papillomavirus (HPV) vaccine, which protects against certain cancers, and the documented lack of evidence supporting a link between the Measles, Mumps, and Rubella (MMR) vaccine and autism. Conversely, immune sera provide immediate passive protection post-exposure, or against specific toxins (antitoxins) or venom (antivenins), though they carry the risk of serum sickness, a massive immune reaction against the foreign proteins. Both vaccines and immune sera lack defined pharmacokinetic profiles, as they are processed similarly to endogenous antibodies. Nursing considerations for all biologicals emphasize thorough patient assessment for contraindications, such as immune deficiency, pregnancy, known allergies, or recent administration of blood products. Implementation protocols require having emergency equipment like epinephrine readily available for severe hypersensitivity reactions and providing comfort measures for common adverse effects, which typically include flu-like symptoms and localized injection site pain. A critical patient teaching point is the absolute need to avoid administering aspirin to children to manage post-immunization discomfort, due to the potential risk of Reye syndrome. Furthermore, healthcare providers must counsel patients and parents on the importance of maintaining accurate, written records of all administered biologicals.