eMedicine Specialties > Infectious Diseases > Viral Infections
Rhinoviruses: Differential Diagnoses & Workup
Updated: Jun 30, 2008
- Overview
- Differential Diagnoses & Workup
- Treatment & Medication
- Follow-up
Differential Diagnoses
| Adenoviruses | Rhinitis, Allergic |
| Bronchitis | Sinusitis, Acute |
| Coxsackieviruses | Streptococcus Group A Infections |
| Infectious Mononucleosis | Upper Respiratory Infection |
| Influenza | |
| Parainfluenza Virus |
Other Problems to Be Considered
Coronavirus
Sphenoid sinusitis
Nonallergic rhinitis
Respiratory syncytial virus infection
Workup
Laboratory Studies
- Because common-cold manifestations are so common, an aggressive workup is rarely necessary if findings from a thorough history and physical examination are consistent with a viral etiology and no complications are noted. Differentiation of one virus from another or one serotype of rhinovirus from another is difficult based on clinical presentation.
- Shedding of virus peaks at 48 hours but can persist for up to 3 weeks. Virus can be cultured on M-HeLa and human embryonic lung cells with typical cytopathic effect observed after culture, at 33-35°C on roller drums, for 2-6 days. Culture occasionally takes up to 14 days. Because of the prolonged time to obtain positive culture findings, it has rarely been found useful in clinical settings.
- Identity is confirmed by the acid sensitivity of the isolate. Specialized laboratories can identify serotypes by antibody neutralization, which requires a large battery of antisera.
- Polymerase chain reaction (PCR) is currently available. This testing is faster and more sensitive than culture. Real-time PCR has been shown to be a rapid and effective way to detect rhinoviruses and has been proposed as the clinical method of detection. PCR has been found most useful in clinical settings in testing patients who are severely immunocompromised, such as patients who have undergone bone marrow transplant. PCR must be used carefully. One study has reported persistent positive results for 5-6 weeks following admission of children for illnesses determined to be secondary to rhinoviral infection. Furthermore, the use of nested PCR techniques has resulted in up to 20% of illnesses being attributed to more than one organism.19
- The large number of serotypes restricts the use of immunocytochemical methods and serology testing.
- Peripheral white blood cell counts may be elevated during the first 2-3 days of the infection, although use of common laboratory tests, such as complete blood count and erythrocyte sedimentation rate, are of virtually no benefit in managing rhinoviral infections.
- Consider bacterial throat culture or rapid strep test to identify the presence of GAS if oropharyngeal examination suggests streptococcal infection.
Imaging Studies
- Chest radiography is seldom needed and should be obtained only if another lower respiratory tract infection (eg, pneumonia) is suspected.
- Sinus films or CT scanning of the sinuses may be used in cases of suspected sinusitis, although this imaging cannot differentiate viral processes from bacterial processes.
Procedures
- Although respiratory tract aspirations, brushings, and biopsies have been used in research protocols to identify etiologies of infections, these tests are of limited value in individual patients.
More on Rhinoviruses |
| Overview: Rhinoviruses |
Differential Diagnoses & Workup: Rhinoviruses |
| Treatment & Medication: Rhinoviruses |
| Follow-up: Rhinoviruses |
| References |
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References
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Further Reading
Keywords
rhinoviruses, rhinovirus infection, cold, common cold, respiratory virus, RV, acute respiratory tract infection, ARTI, upper respiratory tract infection, URTI, otitis media, sinusitis, chronic bronchitis, lower respiratory tract illness, rhinoviral infection, rhinorrhea
Differential Diagnoses & Workup: Rhinoviruses