Rubella (German measles)
- Other viral exanthem, eg, measles, erythema infectiosum ("slapped-cheek" disease), exanthem subitum (roseola), primary HIV infection
- Infectious mononucleosis
- Polyarthritis due to other causes, eg, reactive arthritis, parvovirus B19, post-rubella vaccination
- Rocky Mountain spotted fever
- Drug eruption
- Congenital herpes simplex virus, syphilis, toxoplasmosis, or cytomegalovirus
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