NATURAL HOLISTIC MEDICINE BLOG - A major new study has sounded an alarm regarding Australia’s vulnerability to measles, estimating that approximately 1.7 million Australians lack sufficient immunity against the highly contagious virus. This landmark research, spearheaded by the National Centre for Immunisation Research and Surveillance, suggests that the country’s protective shield against a potential outbreak is showing significant cracks.
In 2019, data indicated that 6.7 per cent of the Australian population did not possess adequate immunity to measles, translating to nearly seven out of every 100 people being susceptible if exposed. As international travel resumes and measles cases associated with overseas visits rise sharply, health experts are warning that the gap in protection may have widened further since that study, particularly due to post-pandemic shifts in vaccination uptake.
The Rising Threat of Measles in Australia
The urgency of these findings is underscored by recent data from the National Notifiable Diseases Surveillance System. Measles notifications have experienced a dramatic surge, jumping from single figures in 2022 to 181 reported cases in 2025, with an additional 113 cases already recorded in the early months of 2026.
Lead author Zoe Croker emphasized that Australia’s status as a measles elimination success story—held since 2014—is not a guarantee of future safety. While Australia’s overall immunity sat at 93.3 per cent in 2019, keeping the nation within the World Health Organisation’s (WHO) target range for herd protection, experts warn that this margin is dangerously thin.
Identifying the Vulnerability Gap
The research provides a granular analysis of who is most at risk, revealing that protection is not distributed evenly across the population. The most significant immunity gaps were identified among babies who are too young to complete their full vaccination schedule and, notably, Australians born from the late 1970s onwards.
Specifically, every birth cohort from 1977 forward was estimated to have at least 5 per cent of individuals susceptible to the virus. This demographic is particularly concerning because these age groups include parents raising young families and frequent international travelers, creating a vector for the virus to be reintroduced into homes and local communities.
Demographic Shifts and Case Statistics
The study also highlighted that individuals aged 15 to 35 accounted for half of all reported measles cases in Australia between 2008 and 2022. Ms. Croker described measles as "one of the most contagious diseases known," noting that even small immunity gaps create substantial opportunities for rapid transmission when imported cases enter the country.
The research is the first of its kind internationally to combine data from the national immunisation register with multiple serosurveys—which test blood samples to quantify immunity levels. This innovative methodology allows researchers to see a more accurate picture of vulnerability across all age groups than ever before.
Global Lessons and the Risk of Losing Elimination Status
Senior author Professor Frank Beard warned that national averages might mask deeper vulnerabilities in specific regions or communities. Some areas may harbor immunity gaps substantially higher than the national average, significantly elevating the risk of localized outbreaks should the virus gain a foothold.
Professor Beard pointed to the experiences of countries like the UK, Spain, and Canada as a cautionary tale. These nations have recently lost their WHO-certified measles elimination status, serving as a reminder that this public health milestone must be actively maintained through consistent, high-level population immunity.
Expert Guidance: How Australians Can Protect Themselves
Health authorities are now urging all Australians born during or after 1966 to verify their immunity status, especially those planning international travel. Individuals are encouraged to check their personal vaccination records and consult with a General Practitioner (GP) or immunisation provider to confirm they have received two doses of a measles-containing vaccine.
Professor Beard reassured the public that for those unsure of their vaccination history, it is safe to receive one or two additional doses of the vaccine. Staying up to date not only safeguards the individual but also protects vulnerable infants, immunocompromised community members, and maintains Australia’s hard-won measles elimination status.
As Australia faces this renewed public health challenge, the message from the research team is clear: immunity cannot be taken for granted. Proactive verification and vaccination are the most effective tools to prevent a return of a disease that the nation has successfully kept at bay for over a decade.
Frequently Asked Questions (FAQ)
What is the recommended herd immunity threshold for measles according to the WHO?
The World Health Organisation recommends a population immunity level of 93 to 95 per cent to ensure effective herd protection against measles.
Why are people born after 1977 at a higher risk of measles?
The study identified that birth cohorts from 1977 onwards have higher rates of susceptibility to measles. Many individuals in these age groups may have gaps in their vaccination history, and because they are active in raising families and traveling internationally, they are more likely to encounter the virus.
What should I do if I am unsure about my measles vaccination history?
Health experts recommend checking your personal vaccination records or speaking with your GP. If you cannot confirm you have received two doses of a measles-containing vaccine, it is generally considered safe and recommended to receive the vaccination.
What are the risks of losing measles elimination status?
Losing elimination status means the virus is no longer considered interrupted in the country, leading to potential localized outbreaks, increased hospitalizations, and a heavier burden on the public health system, as seen in countries like the UK and Canada.
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