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ContentsSynopsisCodesLook ForDiagnostic PearlsDifferential Diagnosis & PitfallsBest TestsManagement PearlsTherapyReferencesInformation for PatientsView all Images (29)
Viral exanthem in Adult
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Viral exanthem in Adult

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Contributors: Priyanka Vedak MD, Susan Burgin MD
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Synopsis

The term "exanthem" is derived from the Greek "exanthema," which translates to "breaking out," and is used to describe cutaneous eruptions that arise abruptly and on several skin surfaces at once. In contrast, "enanthem" refers to mucous membrane involvement. Several viral infections are associated with viral exanthems and/or enanthems. Many of the cutaneous and mucosal findings of these infections are nonspecific in nature, but key aspects of the clinical history and presentation can suggest select etiologies.

During spring and winter, nonspecific eruptions can be seen with upper respiratory illnesses, often due to parainfluenza viruses, respiratory syncytial viruses, rhinovirus, and type A and B influenza virus. These are generally morbilliform in appearance and last for up to 2 days, and largely occur in children. Petechial lesions can also be seen in influenza and enteroviral infections when generalized.

The classic childhood viral exanthems come from diseases rarely seen in adults. These diseases were originally named numerically for the order in which they were discovered. Second disease (scarlet fever) is secondary to a bacterial infection and will not be covered in this section. Fourth disease is no longer felt to represent a distinct entity. Measles and rubella have largely been prevented by vaccination in industrialized countries; however, suspicion must remain high given the recent trend toward refusing childhood vaccination and in the case of migrants who may not have been immunized.

First disease (measles, rubeola) occurs secondary to paramyxovirus. Third disease (rubella, German measles) occurs secondary to togavirus. Fifth disease (erythema infectiosum) occurs secondary to parvovirus B19. Papular purpuric gloves and socks syndrome (PPGSS) is also caused by parvovirus B19 and typically occurs in young adults, but cases have been reported in children. Sixth disease (roseola, exanthem subitum) occurs secondary to human herpesvirus (HHV)-6 or HHV-7. Pityriasis rosea is also thought to occur secondary to HHV-6 and HHV-7.

A diffuse morbilliform eruption can also be seen following administration of amoxicillin or ampicillin in patients with Epstein-Barr virus (EBV). Human immunodeficiency virus (HIV) seroconversion in results in an erythematous exanthem in 50% of adults.

The presence of vesicular lesions can raise concern for varicella-zoster virus (VZV) and hand-foot-and-mouth disease (HFMD).

In immunocompromised patients, persistent or recurrent infections is a concern. Immunosuppressed patients can demonstrate chronic recurrent HFMD, persistent parvovirus B19 with chronic anemia due to persistent lysis RBC precursors, and disseminated VZV. Immunosuppressed patients can also present with an altered presentation. Measles can present without a viral exanthem or with a mild exanthema in patients with congenital or acquired T-cell defects. In primary and secondary T-cell deficiency, there is an increased risk of severe varicella that may be hemorrhagic, may disseminate systemically, and may be fatal.

In pregnant patients, the presence of a viral exanthem raises concern for a select group of infections that can have consequences on fetal development. Parvovirus infection can result in nonimmune fetal hydrops, fetal death (particularly with infection in first trimester), and miscarriage. Rubella infection (most susceptible in first and second trimesters, variable clinical picture in third trimester) can result in congenital cataracts and "blueberry muffin" skin lesions. These violaceous papules can also be seen in TORCH syndrome (Toxoplasma, Other infections [such as HIV], Rubella, Cytomegalovirus, and Herpes simplex).

In returning travelers, infectious diseases such as chikungunya, dengue fever, zika, yellow fever, West Nile virus, lassa fever, and South American hemorrhagic fever may be causes of viral exanthems.

Codes

ICD10CM:
B09 – Unspecified viral infection characterized by skin and mucous membrane lesions

SNOMEDCT:
49882001 – Viral exanthem

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Last Reviewed: 06/27/2017
Last Updated: 07/26/2017
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Viral exanthem in Adult
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Viral exanthem : Fever, Rash, Widespread
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