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Measles

There is an active measles alert in place – anyone who attended the locations during the listed dates and times should stay alert for symptoms. Clinicians are encouraged to view the Measles quick guide for primary healthcare workers (PDF 324KB) and Aboriginal Health Council of WA measles resources (external site).

Statutory notification

Measles infection is an urgently notifiable infectious disease in Western Australia.
Alert: Cases must be reported urgently by telephone to the local public health unit within a few hours of first suspicion of diagnosis.
Case definition: See Measles (external site) national surveillance case definition.
Notification: Using the communicable disease notification form for metropolitan residents (PDF 214KB) or regional residents (PDF 213KB). For notification of regional residents see contact details of public health units.
See also description of statutory medical notifications in Western Australia.

Public health summary

Infectious agent: Measles virus.
Transmission: Measles is highly infectious and can be spread via airborne and respiratory droplets to those sharing the same airspace.
Incubation period: 7-18 days (average 10 days) from exposure to fever and usually 14 days until rash appears.
Infectious period: People are usually infectious from 24 hours prior to onset of prodromal symptoms until 4 days after onset of rash. Where the prodrome is undefined, the onset of the infectious period is considered to be 4 days before rash onset.
Case exclusion: Cases should not attend childcare, school or work from onset of symptoms to 4 days after onset of rash and should stay home (unless isolated in hospital). See Measles – CDNA National Guidelines for Public Health Units (external site).
Contact exclusion: Exclude unimmunised contacts from childcare and school. See Measles – CDNA National Guidelines for Public Health Units (external site).
Treatment: No specific antiviral treatment. Symptomatic treatment only.
Immunisation:
- MMR vaccines to be administered according to the Western Australian immunisation schedule.
- Anyone born in or after 1966 who is not immune to measles should have two doses of measles vaccine, this especially applies to health care workers, childcare workers or people who plan to travel overseas.
- Infants aged under 12 months, who are travelling overseas to countries experiencing a measles outbreak can receive a free measles vaccine (MMR) from six months of age, after an individual risk assessment by their general practitioner or travel doctor (consultation fees may apply).
- Healthcare facilities should have an occupational vaccination program in place that offers measles immunity screening/vaccination to new and existing staff (including administrative staff) – see Measles – CDNA National Guidelines for Public Health Units (external site) for acceptable evidence of immunity. The Australian Immunisation Handbook provides guidance on Vaccination for people at occupational risk (external site) and Vaccination for people who care for others (external site). Also see RACGP Staff immunisation policy and procedures (external site).
- For clinical guidance on MMR vaccination, visit the Measles immunisation program page and the Australian Immunisation Handbook – Measles (external site).
Case follow-up: Is conducted by public health units and the Communicable Disease Control Directorate.

Information and resources for health providers

Guidelines for public health units

Notifiable disease data and reports

Last reviewed: 08-10-2025

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