Emerging infectious diseases are those that have newly appeared in a population or have existed previously but are rapidly increasing in incidence or geographic range. Re-emerging infectious diseases are known illnesses that once showed declining incidence but are now staging a significant comeback. In Nigeria, the constant interplay of environmental changes, urbanization, and ecological shifts creates fertile ground for both categories to threaten public health. Nurses must grasp these definitions because early recognition of an unusual disease cluster often begins at the primary healthcare level.
Nigeria faces a dual burden of endemic and epidemic-prone diseases. Lassa fever, a viral haemorrhagic fever transmitted by multimammate rats, peaks during the dry season. Cholera outbreaks recur annually, frequently linked to compromised water infrastructure and flooding during the rainy months. Furthermore, yellow fever and measles continue to challenge immunization coverage in remote rural settlements. Understanding these local endemic threats allows nurses to anticipate seasonal spikes and prepare isolation facilities accordingly.
Infectious agents enter the human host through various portals including the respiratory tract, mucous membranes, broken skin, or the gut. Once inside, they evade host immune defenses, multiply, and cause cellular injury through toxin production or direct cytopathic effects. Transmission dynamics vary: droplet spread requires close contact, airborne transmission involves aerosolized nuclei remaining suspended in air, and vector-borne diseases rely on arthropods like mosquitoes or ticks to bridge the gap between hosts.
Patients presenting with emerging infections often exhibit non-specific early signs such as high fever, severe fatigue, myalgia, and headache. In viral haemorrhagic fevers, disease progression may introduce bleeding tendencies, petechiae, and multi-organ dysfunction. A thorough nursing assessment must capture recent travel history, occupational exposures, and contact with sick individuals. Early identification of red flags like hypotension, altered mental status, or tachypnea prevents rapid clinical deterioration.
Accurate diagnosis relies on a combination of routine hematology and specialized microbiology tests. Complete blood counts often reveal leukopenia, leukocytosis, or thrombocytopenia depending on the specific pathogen. Confirmatory testing utilizes polymerase chain reaction (PCR) assays to detect viral RNA or antigen-detection rapid diagnostic tests for prompt screening. Nurses play a crucial role in safely collecting, packaging, and transporting biological specimens while maintaining strict chain-of-custody and biosafety standards.
Management of emerging infections often hinges on early supportive care combined with specific antimicrobial therapy where available. For viral hemorrhagic fevers like Lassa fever, antiviral medications such as ribavirin are most effective when administered early in the disease course. Supportive therapy focuses on aggressive fluid resuscitation, electrolyte management, fever control, and monitoring for secondary bacterial infections. Nurses must monitor fluid balance meticulously to avoid complications like pulmonary edema during rehydration.
Public health surveillance is the continuous, systematic collection and analysis of health data essential for planning and implementation. In Nigeria, agencies like the Nigeria Centre for Disease Control (NCDC) coordinate outbreak responses and enforce disease notification protocols. Nurses serve as vital informants by reporting notifiable diseases immediately upon suspicion. Robust policy frameworks and international health regulations ensure cross-border cooperation, protecting global health security against rapid pathogen dissemination.