Postnatal rubella is most commonly diagnosed by serological testing in patients who present with a generalised maculopapular rash, fever >37.2°C (99°F), and arthralgia/arthritis, lymphadenopathy, or conjunctivitis. Diagnostic testing is indicated for people with risk factors for rubella (under-immunisation, known contact with a case of rubella, travel to a region of the world where rubella is endemic) and a clinical picture consistent with rubella. Identifying contagious people may prevent the spread of rubella to susceptible contacts, especially pregnant women. Diagnostic testing is also indicated for people who have risk factors for rubella and who have potential complications of the disease, for example, arthritis, thrombocytopenia, or encephalitis.

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