eMedicine Specialties > Dermatology > Viral Infections
Measles, Rubeola: Differential Diagnoses & Workup
Updated: May 18, 2007
- Overview
- Differential Diagnoses & Workup
- Treatment & Medication
- Follow-up
Differential Diagnoses
Drug Eruptions
Gianotti-Crosti Syndrome (Papular Acrodermatitis
of Childhood)
Hypersensitivity Vasculitis (Leukocytoclastic
Vasculitis)
Kawasaki Disease
Rubella
Syphilis
Other Problems to Be Considered
Exanthems usually associated with systemic lymphadenopathy
Brucellosis
Cytomegalovirus
Gianotti-Crosti syndrome
HIV (primary)
Mononucleosis + ampicillin or allopurinol
Kawasaki disease
Rubella (German measles)
Syphilis (congenital, secondary)
Toxoplasmosis
Anticonvulsant hypersensitivity syndrome
Drug reaction
Measles
Enterovirus, echovirus, coxsackievirus
Infectious hepatitis
Rat bite fever (Spirillum minus)
Workup
Laboratory Studies
- The diagnosis of measles is made on a clinical basis and historically does not require a diagnostic workup. Given the rarity of measles in the United States, laboratory confirmation of the disease should be sought. Contact your local public health department and the CDC for any suspected cases of measles.
- The CDC recommends that a sample of the patient's serum be obtained for measles IgM antibody testing. Although commercial antibody tests are available, any positive results obtained from these tests must be confirmed by the IgM enzyme immunoassay (EIA-IgM) developed by the CDC. This assay has been thoroughly evaluated and is both highly sensitive and highly specific for anti–measles IgM antibodies. The CDC EIA-IgM is the reference test for measles in North America and South America.
- Other methods of detecting measles infection have also been developed. A radioimmunoassay technique that detects anti–measles IgM antibodies in oral fluids has been used in the United Kingdom. The CDC is currently trying to develop a similar EIA that can detect IgM antibodies in oral fluids rather than requiring blood samples. In addition to simply detecting measles infection, the particular strain of the measles virus can be identified by genotyping the viral RNA to determine its origin.
Histologic Findings
Skin biopsy of the fully evolved exanthem of measles is not specific, but the findings can be suggestive of the diagnosis. The histologic findings include psoriasiform epidermal hyperplasia, spongiosis, parakeratosis, and occasional dyskeratotic keratinocytes. Multinucleated keratinocytes (Warthin-Finkeldey giant cells) may be seen. A superficial, perivascular lymphocytic infiltrate associated with variable erythrocyte extravasation is present in the dermis. Multinucleated lymphoid cells containing intranuclear and cytoplasmic inclusions may be observed.
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References
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Further Reading
Keywords
rubeola, morbilli, rubeola measles
Differential Diagnoses & Workup: Measles, Rubeola