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Rubella / German Measles
1990 Case Definition

Clinical Criteria

An illness with all of the following characteristics:

  • Acute onset of generalized maculopapular rash
  • Temperature greater than 37.2°C ( greater than 99°F), if measured
  • Arthralgia/arthritis, or lymphadenopathy, or conjunctivitis
Cases meeting the measles case definition are excluded. Also excluded are cases with serology compatible with recent measles virus infection.

Laboratory Criteria for Diagnosis

  • Isolation of rubella virus, OR
  • Significant rise in rubella antibody level by any standard serologic assay, OR
  • Positive serologic test for rubella immunoglobulin M (IgM) antibody

Case Classification


Any generalized rash illness of acute onset


A case that meets the clinical case definition, has no or noncontributory serologic or virologic testing, and is not epidemiologically linked to a laboratory-confirmed case


A case that is laboratory confirmed or that meets the clinical case definition and is epidemiologically linked to a laboratory-confirmed case