Chapter 66: Managing Infectious Diseases

The progression to infectious disease occurs when the host experiences a decline in wellness due to the pathogen. Preventing illness relies on understanding the Chain of Infection, a series of elements including the causative organism (like bacteria or viruses), a reservoir (a source of living conditions for the microbe), a portal of exit, a mode of transmission (which can include airborne or contact routes), a portal of entry, and finally, a susceptible host. Nurses intervene at every point along this chain, emphasizing Standard Precautions for all patients and utilizing Transmission-Based Precautions—airborne, droplet, or contact—when specific contagious or epidemiologically significant agents are present. A critical intervention is meticulous hand hygiene, which must be performed frequently, especially after glove removal, and involves washing with soap and water when organisms like spore-forming Clostridioides difficile (C. difficile) are present, as they are resistant to alcohol-based products. The text explores the growing concern over Healthcare-Associated Infections (HAIs), detailing key resistant pathogens such as Methicillin-Resistant Staphylococcus aureus (MRSA), Vancomycin-Resistant Enterococcus (VRE), and Carbapenem-Resistant Enterobacteriaceae (CRE). When managing diarrheal diseases caused by agents like Norovirus, Salmonella, or Shigella, the priority is preventing and correcting dehydration using strategies such as Oral Rehydration Salts (ORS) solution, alongside education on food safety. Sexually Transmitted Infections (STIs), which are highly prevalent, are discussed in terms of risk reduction—using the term safer sex to emphasize that condoms reduce but do not eliminate risk. Specific STIs include Syphilis (characterized by primary chancres, secondary rashes, and potential tertiary complications like neurosyphilis) and the co-infections of Gonorrhea and Chlamydia, which often require dual treatment due to frequent co-occurrence and asymptomatic presentation. The chapter extensively covers Emerging Infectious Diseases, defined by their increasing incidence. This includes COVID-19, caused by SARS-CoV-2, which is highly contagious via aerosols and droplets, requiring complex combinations of transmission-based precautions and extensive PPE use. Other emergent threats discussed are Ebola Virus Disease, requiring highly structured PPE protocols due to transmission through body fluids, Zika Virus, known for congenital abnormalities and sexual transmission, and Legionnaires Disease, an infection acquired from aerosolized water sources but not transmitted human-to-human. Finally, the chapter reinforces the vital role of vaccination programs in public health for diseases like influenza, measles, mumps, and rubella, and emphasizes the nurse's advocacy role in promoting immunization and ensuring accurate reporting of any adverse events through the Vaccine Adverse Event Reporting System (VAERS).