APEA Predictor Practice Exam

The primary cause of acute respiratory infections in pediatrics is viruses. This is due to the high prevalence of viral pathogens that contribute to respiratory illnesses in children, especially in younger age groups. Viruses such as respiratory syncytial virus (RSV), rhinovirus, influenza, and parainfluenza are commonly encountered in pediatric populations and tend to spread easily in daycare and school settings. These viral infections often present with symptoms such as cough, runny nose, and fever, and can lead to complications like bronchiolitis or pneumonia, particularly in infants and young children. The immune systems of younger children are still developing, making them more susceptible to these viral infections. While bacteria can also cause respiratory infections, they are less frequent compared to viral causes. Fungi and allergens are generally not primary causes of acute respiratory infections, as fungal infections are relatively rare in otherwise healthy children, and allergens tend to trigger chronic conditions like asthma rather than acute infections.