Chapter 21: Concepts of Care for Patients With Infection

The chapter establishes infection as the invasion and proliferation of microorganisms within the body, emphasizing that infection develops only when a susceptible host, pathogen source, and transmission route converge simultaneously. Understanding pathogen characteristics such as virulence, communicability, and tissue-damaging capacity enables nurses to anticipate infection risks and implement targeted preventive strategies. Host susceptibility varies based on factors including advanced age, chronic disease states, immunocompromisation, invasive medical procedures, nutritional deficiencies, and environmental exposures. The chapter delineates three primary transmission routes—direct or indirect contact, droplet dispersal, and airborne particles—with contaminated hands, medical equipment, and environmental surfaces representing common infection sources. Hand hygiene emerges as the single most effective infection prevention intervention across all care settings. The Centers for Disease Control and Prevention framework of Standard Precautions, applicable universally to all patients, and Transmission-Based Precautions, targeted toward specific pathogens like tuberculosis, influenza, and Clostridioides difficile, provides evidence-based guidance for nurses. Appropriate personal protective equipment selection and use, including gloves, gowns, masks, face shields, and powered air-purifying respirators, protects both patients and healthcare workers. Healthcare-associated infections, particularly catheter-associated urinary tract infections, central line-associated bloodstream infections, and surgical site infections, result from infection control lapses and significantly increase morbidity, mortality, and healthcare costs. The growing concern of antimicrobial resistance and multidrug-resistant organisms, including methicillin-resistant Staphylococcus aureus, vancomycin-resistant Enterococcus, and carbapenem-resistant Enterobacteriaceae, requires nurses to promote antibiotic stewardship and understand how biofilm formation protects bacteria on medical devices. Assessment involves recognizing clinical indicators such as fever, elevated heart rate, lymphadenopathy, inflammatory responses, and laboratory abnormalities including leukocytosis, elevated erythrocyte sedimentation rate, and positive cultures. Management encompasses antimicrobial and antipyretic therapy with careful attention to dosing, duration, allergies, and adverse effects, alongside supportive measures such as hydration and temperature regulation. Nurses must vigilantly monitor for serious complications including sepsis and disseminated intravascular coagulation. Education regarding vaccination, personal hygiene, food safety, and medication adherence extends infection prevention beyond institutional walls into community and home-based care, reflecting the nurse's role as an educator and advocate for population health.