Australia measles immunity gaps leave 1.7 million people vulnerable

measles immunity vaccination gaps public health outbreak risk immunisation

A landmark study by the National Centre for Immunisation Research and Surveillance (NCIRS) has revealed that approximately 1.7 million Australians were susceptible to measles in 2019. The research found that 6.7% of the population lacked sufficient immunity, placing the national immunity level at 93.3%—at the very bottom of the World Health Organization’s recommended 93–95% range for herd immunity.

Vulnerability is unevenly distributed, with significant gaps identified among infants, young children, and adults born from the late 1970s onwards. This specific cohort, aged 15–35, accounts for half of Australia’s reported measles cases since 2008. Experts warn that immunity levels may have declined further since 2019 due to falling childhood vaccination rates following the COVID-19 pandemic.

The risk is compounded by rising global measles activity. The Pan American Health Organization has flagged a 'very high' risk in the Americas, and countries like Canada and the UK have lost their WHO-certified measles elimination status. This creates a dual threat: outbound travelers from vulnerable Australian cohorts face higher risks abroad, while inbound travelers may introduce the virus into local communities with low coverage. National measles notifications have already shown an upward trend, rising from single digits in 2022 to 181 cases in 2025, with 113 cases recorded in early 2026.

Entities

Australia · Frank Beard · National Centre for Immunisation Research and Surveillance · World Health Organization · Zoë Croker

Claims

What the coverage asserts, and how many sources carry each claim.

[○ 1 SOURCE] Vulnerability is particularly high among Australians born from the late 1970s onwards. travelweekly.com.au
[● 2 SOURCES] Overall measles immunity in Australia was 93.3% in 2019. www.wavefm.com.au · www.perthnow.com.au
[○ 1 SOURCE] Measles notifications in Australia rose to 181 cases in 2025. www.perthnow.com.au
[○ 1 SOURCE] The public health risk across the Americas is assessed as 'very high' due to a 2025–2026 resurgence. travelweekly.com.au
[○ 1 SOURCE] 113 measles cases had been recorded in Australia so far in 2026. www.perthnow.com.au
[● 2 SOURCES] The WHO target for herd immunity is between 93% and 95%. www.wavefm.com.au · www.perthnow.com.au
[○ 1 SOURCE] Approximately 6.7% of the Australian population lacked sufficient immunity to measles in 2019. www.perthnow.com.au
[● 2 SOURCES] An estimated 1.7 million Australians were susceptible to measles in 2019. www.wavefm.com.au · www.perthnow.com.au

Sources

1. 7 million Australians are not protected against measles… Is someone you know one of them? [www.wavefm.com.au]

7 days ago

Measles immunity gaps put outbound and inbound travellers at risk, researchers warn [travelweekly.com.au]

7 days ago

Shock number of Aussies at risk of measles [www.perthnow.com.au]

7 days ago

Measles warning puts focus on vaccination gaps and pharmacy access [www.theindiansun.com.au]

5 days ago