Airborne infections are diseases spread through small respiratory droplets, known as droplet nuclei, that remain suspended in the air over long distances and time. These microscopic particles, generally measuring 5 micrometers or smaller, are generated when an infected person coughs, sneezes, talks, or undergoes aerosol-generating medical procedures. Unlike larger droplets that quickly drop to the ground within a meter, droplet nuclei evaporate partially and can drift on air currents across entire rooms or hospital wards. Susceptible hosts inhale these pathogens into their respiratory tracts, where the infection can establish itself depending on the virulence of the organism and the host immune status. Recognizing this transmission dynamic is the foundation of respiratory isolation protocols in clinical practice.
The pathogenesis of airborne diseases begins with inhalation. Once a susceptible individual breathes in infectious droplet nuclei, the particles bypass the mechanical filters of the upper airway due to their minuscule size and reach the terminal alveoli. Pathogens such as *Mycobacterium tuberculosis* settle in the lung parenchyma, where alveolar macrophages phagocytose them. While macrophages often contain the infection, forming granulomas, immune suppression or high bacillary loads can lead to active disease. Transmission efficiency depends heavily on environmental factors like poor room ventilation, high humidity, and crowding, which concentrate infectious aerosols in enclosed spaces.
Nigeria faces a substantial burden of airborne infectious diseases, with tuberculosis (TB) and measles remaining major public health concerns.
Assessing a patient with suspected airborne infection requires a careful history focusing on duration of cough, fever patterns, and contact with known infected individuals. Nurses must observe respiratory rate, depth, and effort, checking for signs of respiratory distress such as nasal flaring, use of accessory muscles, and cyanosis. Auscultation often reveals diminished breath sounds, crackles, or bronchial breathing depending on the extent of lung consolidation. Documenting baseline oxygen saturation via pulse oximetry is vital for tracking clinical stability and identifying early hypoxemia before visible distress sets in.
Accurate diagnosis directs appropriate antimicrobial therapy and isolation protocols. Sputum smear microscopy for acid-fast bacilli (AFB) remains a staple for diagnosing pulmonary tuberculosis in resource-constrained settings, alongside molecular tests like GeneXpert MTB/RIF for rapid detection of drug resistance. Chest radiography is indispensable for visualizing pulmonary infiltrates, cavities, or consolidation patterns. For viral pathogens, reverse transcription-polymerase chain reaction (RT-PCR) assays using nasopharyngeal swabs provide definitive confirmation.
Managing patients with airborne infections requires a combination of supportive care and strict adherence to containment measures. Nurses must place infectious patients in an Airborne Infection Isolation Room (AIIR) featuring negative pressure ventilation where available. Administering prescribed anti-infective medications strictly on schedule prevents therapeutic failure and resistance development. Nurses also monitor vital signs, manage fevers with appropriate antipyretics, ensure adequate hydration, and encourage nutrition to support immune recovery.
Primary healthcare clinics serve as the first point of contact and must practice rigorous infection prevention and control (IPC) to protect staff and patients. Administrative controls include prompt identification and separation of coughing patients upon arrival at triage. Environmental controls involve maximizing natural ventilation by opening windows and doors, and arranging waiting areas outdoors when feasible. Personal protective equipment (PPE) is mandatory; healthcare workers must wear properly fitted N95 or higher respirators when entering isolation spaces, as surgical masks do not filter out microscopic droplet nuclei.
Community engagement is vital in reducing stigma and promoting early health-seeking behavior regarding airborne infections. Nurses educate communities on cough etiquette, emphasizing the importance of covering the mouth and nose with a tissue or flexed elbow when coughing or sneezing. Public health campaigns also focus on debunking myths, promoting good home ventilation, and encouraging individuals with persistent coughs to seek early diagnosis at designated health facilities rather than relying on self-medication.