Acute upper respiratory tract infection in pediatrics

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Acute Upper Respiratory Tract Infection (URTI) in Pediatrics

Overview

Acute URTI (the "common cold") is arguably the highest-incidence illness in humans. Children average 5-6 symptomatic episodes per year in early childhood, declining to 1-2 per year in adults. Studies show that 9 out of 10 children will experience at least one cold in a given year. It is the most common reason for pediatric outpatient visits and school absenteeism worldwide.

Etiology

Viral pathogens account for the overwhelming majority of cases. Key causative agents:

Virus Group	Antigenic Types	% of Cases
Rhinovirus	>150 types (A, B, C)	30-60%
Coronavirus	5 types	10-15%
Respiratory Syncytial Virus (RSV)	2 subgroups (A, B)	5-10%
Influenza virus	3 types	5-15%
Parainfluenza virus	5 types	~5%
Adenovirus	>47 types	~5%
Metapneumovirus	2 types	~5%
Bocavirus	4 types	5-20%

Rhinovirus is the single most common cause of upper respiratory symptoms in children and their family members. Over 150 genotypes exist. Rhinovirus C is particularly associated with severe disease in young children.
Bacterial pathogens (e.g., Mycoplasma pneumoniae, Bordetella pertussis, Group A Streptococcus) are occasionally isolated but their independent role in pure common cold syndrome is unclear; co-detection of virus + bacteria is fairly common.
Secondary bacterial superinfection can occur in 0.5-2% of cases, potentially leading to bacterial sinusitis or otitis media.
Goldman-Cecil Medicine, p. 3503; Medical Microbiology 9e, p. 441; K.J. Lee's Essential Otolaryngology

Epidemiology & Transmission

Infection occurs year-round but peaks in fall/winter in temperate climates.
Risk factors in children: daycare attendance, household crowding, multiple siblings, parental exposure to healthcare settings, pre-existing allergic rhinitis.
Transmission: direct contact with infected secretions, large-particle droplet exposure (<6 feet), and self-inoculation by touching contaminated surfaces or fomites. RSV, for example, can survive on surfaces for several hours and on hands for >30 minutes.
Almost all children are infected by RSV at least once by 24 months of age; reinfection throughout life is common and typically less severe.

Pathophysiology

Viral infection of the upper respiratory epithelium triggers:

Engorged blood vessels + vascular permeability → nasal congestion, rhinorrhea, sneezing
Nociceptive stimulation → sore throat, headache, myalgia
Mechanoreceptor stimulation via the vagus nerve → cough
Systemic inflammatory mediators (interferons, cytokines) → malaise, fatigue, fever

Clinical Features

Symptoms typically evolve in sequence:

Prodrome: scratchy/sore throat (often the first symptom), sneezing
Peak: nasal obstruction, profuse rhinorrhea (initially watery, may become thick and discolored - this does NOT indicate bacterial infection), cough, mild fever, malaise, headache
Resolution: cough may persist for several weeks after other symptoms resolve

Physical examination findings are largely limited to the upper respiratory tract - nasal mucosal swelling, increased secretions, and posterior pharyngeal inflammation.

Age-related nuances:

Infants may present with feeding difficulties, irritability, and mouth-breathing
Fever is more prominent in younger children
Change in color or consistency of nasal secretions is normal during the course of illness and does not indicate bacterial sinusitis

Typical duration: symptoms generally peak within the first few days and resolve within 7-14 days.

Diagnosis

This is a clinical diagnosis - no investigations are routinely needed.

Differential diagnosis includes:

Allergic rhinitis: nasal/conjunctival itching, chronic/recurrent course, no fever; most families can differentiate reliably
Bacterial sinusitis: symptoms persisting >10 days without improvement, unilateral maxillary sinus pain, and purulent discharge - a relatively rare complication
Influenza-like illness: rapid onset, higher fever, prominent headache and myalgia
Streptococcal pharyngitis: should be considered when sore throat is the dominant symptom, especially with tonsillar exudate or tender cervical nodes
Foreign body in the nose (especially in toddlers)

Investigations (if needed):

Rapid antigen tests (RSV, influenza) are available but have lower sensitivity in older children
Multiplex RT-PCR nasopharyngeal panels can detect up to 20 pathogens simultaneously - highest sensitivity but not needed for routine outpatient management
Testing is most useful during bronchiolitis hospitalizations (for cohorting purposes) or in immunocompromised patients

Management

In Children <6 Years: Key Safety Rules

Cough and cold medicines (decongestants, antihistamines, antitussives) should NOT be prescribed, recommended, or used in children <6 years due to risk of serious adverse effects.

Supportive care for this age group:

Saline nasal drops + bulb suctioning for nasal congestion
Cool-mist humidifier to ease breathing
Honey (>1 year of age only) for soothing sore throat and cough (do NOT use in infants <12 months - risk of infant botulism)
Adequate oral hydration
Fever management: acetaminophen or ibuprofen (ibuprofen is appropriate from 6 months of age)

In Older Children and Adolescents

Symptom	Treatment
Fever, myalgia, sore throat	Acetaminophen or ibuprofen
Nasal congestion	Topical decongestant (oxymetazoline, 2 sprays BID for ≤5 days) or systemic pseudoephedrine
Rhinorrhea	Intranasal ipratropium bromide (reduces drainage by ~25%); first-generation antihistamines have mild anticholinergic benefit
Cough	Dextromethorphan (limited evidence); if reactive airway disease, inhaled bronchodilator

Antibiotic Use

Antibiotics are NOT indicated for viral URTI. They are more likely to cause an adverse reaction than to prevent complications in any individual patient.
Antibiotics are reserved for confirmed bacterial complications: bacterial sinusitis (symptoms >10 days without improvement), group A streptococcal pharyngitis, or acute otitis media (AOM) with bulging tympanic membrane.

RSV-Specific Management (Bronchiolitis)

For infants hospitalized with RSV bronchiolitis:

Not recommended: beta-agonists, nebulized epinephrine, corticosteroids, ribavirin (insufficient evidence), antibiotics (unless concurrent bacterial infection suspected)
Supported: hydration, supplemental oxygen when SpO2 <90% persistently, nasopharyngeal suctioning, CPAP/heliox/intubation in severe cases (consult critical care)

RSV Prophylaxis: Palivizumab

Palivizumab (humanized anti-F protein monoclonal antibody) may be considered in carefully selected high-risk infants:

Dose: 15 mg/kg IM every 30 days during RSV season
Indicated for selected patients with prematurity, chronic lung disease, or hemodynamically significant congenital heart disease
Not effective as treatment - prophylaxis only

Ineffective / Not Recommended Therapies

The following have no proven benefit or are associated with significant adverse effects:

Echinacea, vitamin C, vitamin D, garlic
Chinese medicinal herbs, Pelargonium sidoides herbal extract
Intranasal corticosteroids
Inhaled steam
Saline nasal irrigation (limited benefit for common cold specifically)
Zinc (may modestly shorten duration in adults but evidence in children is limited; avoid intranasal zinc due to risk of anosmia)

Complications

Complication	Notes
Acute otitis media (AOM)	Most common complication, especially in young children; RSV URTI predisposes
Bacterial sinusitis	~0.5-2% of viral URTIs; diagnose if symptoms >10 days without improvement
Bronchiolitis / lower LRTI	RSV, rhinovirus in infants; rhinovirus is the leading cause of asthma exacerbations in children
Croup	Parainfluenza virus 1 is the primary cause in children <2 years
Pneumonia	Uncommon in healthy children; risk higher in immunocompromised, infants
Reye syndrome	Rare; associated with aspirin use during viral URTI or varicella - avoid aspirin in children

Red Flags - When to Seek Further Care

Advise families to return if any of the following develop:

Fever >39°C (102°F), especially if persistent
Signs of respiratory distress (tachypnea, retractions, grunting, SpO2 <90%)
New ear pain or hearing loss
Persistent unilateral facial pain/swelling (possible sinusitis)
Symptoms lasting >14 days without improvement
Altered mental status or seizures
Poor oral intake / signs of dehydration
Rash (consider meningococcemia, Kawasaki, or other diagnoses)

Prevention

Hand hygiene is the single most effective intervention
Avoid close contact with infected individuals
Influenza vaccination (annual, from 6 months of age) prevents influenza-related URTI
Nirsevimab (monoclonal antibody against RSV F protein) is now approved for broad RSV prophylaxis in infants through the first RSV season, offering wider protection than palivizumab
No specific vaccines exist for rhinovirus, parainfluenza, or coronavirus-related colds (outside of COVID-19 vaccination)
Breastfeeding provides partial protection in infants through passive antibody transfer

Sources:

Goldman-Cecil Medicine, International Edition - Common Cold chapter
Harrison's Principles of Internal Medicine, 22e - Nonspecific Upper Respiratory Infection
Red Book 2021 (AAP) - RSV, Bocavirus, and respiratory pathogens chapters
Medical Microbiology 9e - Oral and Respiratory Diseases
K.J. Lee's Essential Otolaryngology - Viral Rhinitis
Tietz Textbook of Laboratory Medicine - Respiratory Tract Infections

Rsv full form

RSV stands for Respiratory Syncytial Virus.

The name comes from the characteristic syncytia (multinucleated giant cells) that form when the virus causes infected cells to fuse together — visible in cell culture.

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