Related Experiment Video
Updated: Aug 30, 2026

An In vitro Model to Study Immune Responses of Human Peripheral Blood Mononuclear Cells to Human Respiratory Syncytial Virus Infection
Published on: December 10, 2013
Influenza a in young children with suspected respiratory syncytial virus infection
Marla J Friedman1, Magdy W Attia
1Department of Pediatrics, Division of Emergency Medicine, Alfred I. duPont Hospital for Children, Wilmington, DE 19899, USA.
Insights
Influenza A is common in young children with suspected respiratory syncytial virus (RSV) infection. Clinicians should consider influenza A in febrile children with respiratory symptoms.
Area of Science:
- Pediatric Infectious Diseases
- Virology
- Epidemiology
Background:
- Respiratory syncytial virus (RSV) and influenza A are common causes of respiratory illness in young children.
- Differentiating between RSV and influenza A based on clinical presentation alone can be challenging.
- Understanding the prevalence of influenza A in children suspected of RSV is crucial for appropriate management.
Purpose of the Study:
- To determine the prevalence of influenza A in young children with suspected RSV infection.
- To compare the clinical features of children with influenza A versus those with RSV.
Main Methods:
- Prospective observational study of children younger than 36 months presenting with suspected RSV infection during the 2001-2002 influenza A season.
- Eligible children had an RSV antigen test ordered.
- Prevalence of influenza A and clinical presentations were analyzed.
Main Results:
- Of 197 eligible patients, 63% tested positive for RSV and 17% for influenza A.
- Influenza A patients had higher fevers (≥39°C) compared to RSV patients (36% vs. 15%).
- RSV patients exhibited more tachypnea and wheezing than influenza A patients.
Conclusions:
- Influenza A has a high prevalence in young children initially suspected of having RSV infection.
- Clinicians should consider testing for influenza A in young febrile children presenting with respiratory symptoms.
Objectives:
To determine the prevalence of influenza A in young children suspected of having respiratory syncytial virus (RSV) infection and to compare the clinical presentation of these patients with those who have proven RSV infection.
Methods:
Children younger than or at 36 months of age who presented to a pediatric emergency department (ED) with suspected RSV infection during the influenza A season of 2001-2002 were eligible. Eligible children had an RSV antigen test ordered as part of their initial clinical management. A consecutive sample of children was enrolled for prospective observational analysis. The main outcome measure was the prevalence of influenza A in young children with suspected RSV infection. The secondary outcome measure was a comparison of the clinical presentations, of the two groups.
Results:
During the study period, 420 patients presented for evaluation of respiratory illness. RSV tests were ordered on 251 patients. Of 197 eligible patients, 124 (63%) tested positive for RSV and 33 (17%) for influenza A. Influenza A patients were more likely to have temperatures at or above 39 degrees C than RSV patients (36% vs. 15%; p = 0.01). RSV patients were more tachypneic (54 vs. 43 breaths/minute; p < 0.0001) and more often had wheezing (90% vs. 8%; p < 0.0001). Twenty influenza patients (61%) were hospitalized.
Conclusions:
This study found a high prevalence of influenza A in young children suspected of having RSV infection. Clinicians should consider influenza A in young febrile children presenting with respiratory illnesses.
Related Concept Videos
Respiratory Syncytial Virus Disease
Influenza
Acute Pharyngitis
Acute pharyngitis is the inflammation of the back of the throat (pharynx), commonly resulting in a sore throat. It is a frequently encountered condition that prompts individuals to seek medical advice.
Classification
Acute pharyngitis can be categorized based on its underlying cause:
Acute Respiratory Failure-II
The underlying physiological abnormalities that contribute to hypoxemic respiratory failure include:
Acute Respiratory Failure-I
Definition: It is defined by specific criteria based on blood gas measurements. Hypoxemia happens when the partial pressure of oxygen (PaO2) falls below 60 mmHg. At the same time,...
Common Respiratory Disorders
Upper respiratory disorders impact the airways above the vocal cords, encompassing areas like the nose, sinuses, and throat. Various conditions fall under this category, including the common cold and allergic rhinitis. These disorders can stem from several causes,...

