Confirmed Case
Measles compatible illness and laboratory confirmation of infection in the absence of recent (i.e. within the previous 28 days) immunization with measles-containing vaccine. Lab confirmation may be determined by:
- Isolation of measles virus from an appropriate clinical specimen OR
- Detection of measles virus RNA OR
- Seroconversion or a significant (e.g. fourfold or greater) rise in measles IgG titre between acute and convalescent sera OR
- Positive serologic test for measles IgM antibody using a recommended assay in a person who is either epidemiologically linked to a laboratory- confirmed case or has recently travelled to an area of known measles activity OR
- Clinical illness1 in a person who is epidemiologically linked to a laboratory-confirmed case
Clinical / Probable Case
Clinical illness1 in the absence of appropriate laboratory tests and not epidemiologically linked to a laboratory-confirmed case
Suspect Case
All of the following:
- Fever ≥ 38.3° C
- Cough, coryza, or conjunctivitis.
- Generalized maculopapular rash of any duration.
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1Clinical illness is characterized by all of the following features:
- Fever 38.3° C or greater
- Cough, coryza, or conjunctivitis
- Generalized maculopapular rash for at least 3 days