A surge in measles infections during the holiday season has prompted urgent health alerts in New South Wales, South Australia, and Victoria, as health officials scramble to address this growing concern. The rise in cases is largely attributed to increased international travel during the summer months coupled with a troubling decline in childhood vaccination rates.
For the first time in a decade, data from the National Centre for Immunisation Research and Surveillance (NCIRS) reveals that Australia's early childhood vaccination coverage has dropped below the critical 95% threshold needed to maintain herd immunity. Currently, only 89.7% of two-year-olds are vaccinated, marking an 11.4 percentage point decrease in children receiving their first dose of the MMR (measles, mumps, and rubella) vaccine on time compared to pre-pandemic figures.
In 2025, Australia recorded a staggering 168 measles cases—almost triple the 57 cases reported in 2024. This unexpected spike in infections coincides with an uptick in measles cases linked to holiday travel. On Sunday, health departments in New South Wales and South Australia issued warnings after the local "Boxing Day cluster" grew to seven cases, which were traced back to a single traveler who was contagious while visiting several busy public venues.
In South Australia, an adult contracted the virus overseas and visited Westfield Marion and Event Cinemas on Boxing Day. This individual then went to Cockles Cafe in Port Elliot two days later, before flying from Adelaide to Sydney on Qantas flight QF748. Health authorities in both states are now working diligently to identify and notify fellow passengers and airport visitors who may have been exposed.
New South Wales has confirmed three new cases within the past week, all linked to travelers returning from Southeast Asia. In addition to the aforementioned flight, multiple locations have active alerts throughout northern Sydney. Specific venues include the Macquarie Centre on December 27 between 11:30 AM and 2:30 PM, Waitara Family Medical Practice on December 29 from 9:00 AM to 10:30 AM, the food court and Kmart at Westfield Hornsby on December 30 between 12:30 PM and 3:00 PM, and the emergency department at Hornsby Ku-ring-gai Hospital on December 31 from 5:15 PM to 8:00 PM.
The Boxing Day cluster has also extended its reach to Western Australia, where two cases, including one child, have been confirmed. Furthermore, Victoria reported a separate case involving an adult returning from Bali, underscoring the widespread nature of this outbreak.
While the holiday cluster has triggered alerts across multiple states, the rise in infections was evident weeks earlier. Western Australia experienced a steady increase in cases throughout December, culminating in a total of 60 for the year by the end of last month. Similarly, Queensland health officials issued warnings in mid-December after an infectious traveler arrived on the Gold Coast from Bali.
Given that measles is an airborne virus capable of lingering in the air for up to 30 minutes after an infected person has left the area, authorities are urging all Australians to check their vaccination status. Anyone born in or after 1966 who has not received two doses of the MMR vaccine can obtain a free booster shot. Common symptoms of measles include fever, cough, and runny nose, which are typically followed by a distinctive red rash a few days later.
