Measles
Cases must meet all of the following criteria:

• fever ≥ 38°C present at time of rash onset
• generalised maculopapular rash
• cough or coryza or conjunctivitis or Koplik’s spots present at time of rash onset.

Mumps
An acute illness with unilateral or bilateral tenderness and swelling of the parotid or other salivary gland/s, lasting more than 2 days, with or without fever and without apparent cause. Other clinical manifestations of mumps infection may uncommonly include orchitis, mastitis, oophoritis, meningitis, encephalitis, pancreatitis and hearing loss.

Rubella
An illness with a generalised maculopapular rash and fever AND one or more of the following:

• arthralgia/arthritis
• lymphadenopathy
• conjunctivitis.

Rubella often presents atypically and is difficult to diagnose clinically with certainty. If accurate diagnosis is important it must be laboratory confirmed.