eMedicine Specialties > Pediatrics: General Medicine > Infectious Disease
Rhinovirus Infection
Updated: May 13, 2009
Introduction
Background
Rhinoviruses (RVs) are small (30 nm), nonenveloped viruses that contain a single-strand RNA genome within an icosahedral (20-sided) capsid. Rhinoviruses belong to the Picornaviridae family, which includes the genera Enterovirus (polioviruses, coxsackieviruses groups A and B, echoviruses, numbered enteroviruses, parechoviruses) and Hepatovirus (hepatitis A virus). Approximately 101 serotypes have been identified.
This article focuses on the common cold because it is most frequently associated with rhinovirus. Nasopharyngitis, croup, and pneumonia, which are uncommonly caused by RV, are also briefly discussed. Rhinovirus plays a significant role in the pathogenesis of otitis media and asthma exacerbations.1,2 Although incidence and prevalence are high, most cases are mild and self-limited.
Pathophysiology
Rhinovirus can be transmitted by aerosol or direct contact. The primary site of inoculation is the nasal mucosa, although the conjunctiva may be involved to a lesser extent. Rhinovirus attaches to respiratory epithelium and spreads locally. The major human rhinovirus receptor is intercellular adhesion molecule-1 (ICAM-1).3,4 The natural response of the human defense system to injury involves ICAM-1, which aids the binding between endothelial cells and leukocytes. Rhinovirus takes advantage of the ICAM-1 by using it as a receptor for attachment. In addition, rhinovirus uses ICAM-1 for subsequent viral uncoating during cell invasion. Some rhinovirus serotypes also up-regulate ICAM-1 expression on human epithelial cells to increase susceptibility to infection.
The optimal temperature for rhinovirus replication is 33-35°C. Rhinovirus does not efficiently replicate at body temperature. This may explain why rhinovirus replicates well in the nasal passages and upper tracheobronchial tree but less well in the lower respiratory tract. The incubation period is approximately 2-4 days.5 Viremia is uncommon.
Rhinovirus is shed in large amounts, with as many as 1 million infectious virions present per mL of nasal washings. Viral shedding can occur a few days before cold symptoms are recognized by the patient, peaks on days 2-7 of the illness, and may last as long as 3-4 weeks.
A local inflammatory response to the virus in the respiratory tract can lead to nasal discharge, nasal congestion, sneezing, and throat irritation. Damage to the nasal epithelium does not occur, and inflammation is mediated by the production of cytokines and other mediators.
Histamine concentrations in nasal secretions do not increase. By days 3-5 of the illness, nasal discharge can become mucopurulent from polymorphonuclear leukocytes that have migrated to the infection site in response to chemoattractants such as interleukin-8. Nasal mucociliary transport is markedly reduced during the illness and may be impaired for weeks. Both secretory immunoglobulin A and serum antibodies are involved in resolving the illness and protecting from reinfection.
Coronaviruses, reinfections with parainfluenza, and respiratory syncytial virus (RSV) are the most important of many other viruses that can cause common colds. Other viruses (eg, adenoviruses, influenza viruses) can also cause common colds but are more likely to cause acute nasopharyngitis and more severe respiratory infections.
Mycoplasma pneumoniae can occasionally present with common cold symptoms before developing into more extensive respiratory disease. Other pathogens include Coccidioides immitis, Histoplasma capsulatum, Bordetella pertussis, Chlamydia psittaci, and Coxiella burnetii.
Recent clinical studies indicate sinus involvement in common colds. Abnormalities on CT scan findings (eg, opacification, air-fluid levels, mucosal thickening) are present in adults with common colds that resolve over 1-2 weeks without antibiotic therapy.
Despite what is reported in folklore, no good clinical evidence suggests that colds are acquired by exposure to cold weather, getting wet, or becoming chilled.
Frequency
United States
Common colds are most frequent from September to April in temperate climates. Rhinovirus infections, which are present throughout the year, account for the initial increase in cold incidence during the fall and a second incidence peak at the end of the spring season. Colds that occur from October through March are caused by the successive appearance of numerous viruses, including parainfluenza, coronavirus, RSV, and influenza virus. Adenoviral infections occur at a constant rate throughout the season.
Seasonal variation of selected upper respiratory tract infection pathogens. PIV is parainfluenza virus, RSV is respiratory syncytial virus, MPV is metapneumovirus, and Group A Strept is group A streptococcal disease.
Several studies demonstrate the incidence of the common cold to be highest in preschool and elementary school-aged children. An average of 3-8 colds per year is observed in this age group, with an even higher incidence in children who attend daycare and preschool. Because of the numerous viral agents involved and the many serotypes of several viruses (especially rhinovirus), younger children having new colds each month during the winter season is not unusual. Adults and adolescents typically have 2-4 colds per year.
International
A seasonal increase in incidence during the winter months is observed worldwide.
Mortality/Morbidity
The most common manifestation of rhinovirus, the common cold, is mild and self-limited. However, severe respiratory disease, including bronchiolitis, asthma exacerbations, and pneumonia, can occur, particularly in infants and young children.6
Race
Native Americans and Eskimos are more likely to develop the common cold and appear to have more frequent complications such as otitis media. These findings may be explained as much by environmental conditions (eg, poverty, overcrowding) as by ethnicity.
Age
Because antibodies to viral serotypes develop over time, the highest incidence is found in infants and young children. In addition, young children are more likely to have the frequent, close, personal contact necessary to transmit rhinovirus. Contrary to the experience of adults, children may also be more contagious due to having higher virus concentrations in secretions and longer duration of viral shedding.
Clinical
History
Rhinoviruses (RVs) cause or predispose to various upper respiratory infections (URIs) and lower respiratory infections (LRI), which are less common.
- Common cold
- Nose dryness or irritation is often the first symptom and is followed within hours by profuse watery rhinorrhea, nasal congestion, and sneezing.
- A sore throat or throat irritation is common.
- Malaise, headache, and cough are also common symptoms of the common cold.
- Fever is absent or low grade. Infants and preschoolers are more likely to experience fevers, which are often 38-39°C.
- Nasal secretions typically become thicker and colored after the first few days of illness.
- Irritability or restlessness is common.
- Nasal obstruction can interfere with sleep and feeding.
- Post-tussive vomiting can occur.
- Symptoms in adults and adolescents usually resolve by day 7; however, symptoms often last 10-14 days in younger children.
- Acute otitis media
- Viral URIs are common precipitating factors for acute otitis media (AOM). This is likely because they cause respiratory mucosal inflammation that leads to eustachian tube obstruction.
- Respiratory viruses are found in either the middle ear fluid or nasopharynx in approximately 40% of patients with AOM.
- As many as 24% of patients with AOM have rhinovirus present in nasopharyngeal secretions. Rhinovirus has also been obtained from middle ear fluid.
- Patients whose symptoms are refractory to treatment with antibiotics are more likely to have positive viral cultures from the middle ear.
- Sinusitis: Preceding rhinovirus infection can lead to bacterial superinfection.
- Asthma exacerbations
- Viral URI is a common trigger for asthma exacerbations in children of all ages.
- In children younger than 5 years, rhinovirus and respiratory syncytial virus (RSV) are the most commonly implicated pathogens. Rhinovirus is the most commonly implicated pathogen in older children.
- LRI: Rhinovirus may cause both pneumonia and bronchiolitis in infants.
- Croup: Rhinovirus may cause laryngotracheobronchitis in infants.
- Acute nasopharyngitis
- Acute nasopharyngitis is most commonly caused by adenovirus, enteroviruses, influenza, and parainfluenza.
- Rhinovirus is an uncommon cause of acute nasopharyngitis.
- Common colds, by definition, do not have objective evidence of pharyngeal irritation.
- Cystic fibrosis: Rhinovirus is the implicated virus in as many as 57% of respiratory exacerbations.
- Transmission modes
- Rhinovirus possesses various transmission modes and can infect a huge population at any given time.
- Aerosol transmission is the most common transmission mode for respiratory tract infections (RTIs). Transmission occurs when small airborne particles are inhaled or large droplets are directly touched.
- Direct hand contact with infected secretions or indirect contact with fomites is also important. Patients then infect themselves by touching their noses or conjunctivae.
- Highly contagious behavior includes nose blowing, sneezing, and physically transferring infected secretions onto environmental surfaces or paper tissue.
- Contrary to popular belief, behaviors such as kissing, talking, coughing, or even drooling do not contribute highly to the spread of disease.
- Infection rates approximate 50% within the household and range from 0-50% within schools, which indicates that transmission requires long-term contact with infected individuals. Brief exposures to others in places such as movie theaters, shopping malls, friends' houses, or doctors' offices incur low risk of transmission.
- The incubation period is approximately 2-4 days.
- Because children carry the fewest antibodies, children who attend school are the most common reservoirs of rhinovirus infection.
Physical
Physical characteristics of the common cold include the following:
- The common cold is usually afebrile, although temperatures of 38-39°C are possible in younger children.
- Profuse nasal discharge can be clear and watery or mucopurulent. Purulent secretions are common after the first few days of illness and do not imply bacterial sinusitis unless secretions persist for more than 10-14 days.
- Edema and erythema of nasal mucosae may be present.
- Despite sore throat, the pharynx has a normal appearance, without any erythema, exudate, or ulceration.
- Mildly enlarged nontender cervical lymph nodes are present.
Causes
Factors that increase infection risk and severity are as follows:
- Smoking increases risk of respiratory infection by approximately 50%.
- Very young or old individuals are at greater risk, possibly due to decreased immunity.
- Exposure to infected contacts increases infection risk.
- Touching the conjunctivae or nose with contaminated fingers and/or objects increases infection risk.
- Crowding leads to increased transmission.
- Men may have a slightly, probably insignificant, higher risk.
- Breastfeeding has little effect on the incidence of the common cold.
- Underlying chronic medical conditions, including anatomic, metabolic, genetic, or immunologic disorders (ie, tracheoesophageal fistula, congenital heart disease, cystic fibrosis, immunodeficiency) increase infection risk and severity.
More on Rhinovirus Infection |
Overview: Rhinovirus Infection |
| Differential Diagnoses & Workup: Rhinovirus Infection |
| Treatment & Medication: Rhinovirus Infection |
| Follow-up: Rhinovirus Infection |
| Multimedia: Rhinovirus Infection |
| References |
| Further Reading |
| Next Page » |
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Further Reading
Relevant clinical guidelines include the following:
- Chronic cough in a child
- Evidence-based clinical practice guideline for medical management of bronchiolitis in infants less than 1 year of age presenting with a first time episode
- Guideline for isolation precautions: preventing transmission of infectious agents in healthcare settings 2007. Transmission-based precautions
Keywords
rhinovirus infection, common cold, adenovirus, Bordetella pertussis, Chlamydia psittaci, Coccidioides immitis, coronaviruses, Coxiella burnetii, coxsackieviruses groups A and B, croup, echoviruses, enterovirus, hepatitis A virus, hepatovirus, Histoplasma capsulatum, intercellular adhesion molecule-1, ICAM-1, lower respiratory infection, LRI, Mycoplasma pneumoniae, nasal congestion, nasal discharge, nasopharyngitis, numbered enteroviruses, parainfluenza, parechoviruses, pneumonia, polioviruses, respiratory syncytial virus, RSV, rhinorrhea, RV infection, sneezing, throat irritation, upper respiratory infection, URI, viremia, parainfluenza, acute otitis media, AOM, treatment, diagnosis


Overview: Rhinovirus Infection