Measles Outbreak: Australia on High Alert as Highly Contagious Virus Spreads Across the Globe
- Australia’s measles cases skyrocket by 185% in 2025, with almost half linked to international travel
- Global outbreak sees 100,000 people killed by measles in 2024, with 93% of US patients unvaccinated or unknown vaccination status
- Experts warn of “serious” and “deadly” consequences as vaccine coverage falls below herd immunity threshold in the US
- Australian authorities scramble to contain outbreaks, with multiple locations in NSW and several US airports affected
A highly contagious and potentially deadly virus is spreading rapidly across the globe, with Australia on high alert as measles cases skyrocket. The World Health Organisation (WHO) warns that measles “respects no borders” and can have devastating consequences, particularly for young children.
According to the WHO, measles is one of the most contagious respiratory viruses known, with a person being almost certainly immune if they’ve been vaccinated or contracted the illness before. However, the vaccine’s immunity lasts a lifetime, whereas contracting the illness only provides decades-long protection.
Australia’s Healthdirect warns that measles can lead to serious illnesses or even death, with the country’s measles cases more than doubling in 2025 compared to the previous year. Dr Allen Cheng, an epidemiologist at Monash University, says that almost half of Australia’s cases can be traced back to international travel, highlighting the risk of falling vaccination rates overseas.
The US has been particularly hard hit, with cases surging by over 700% in 2025. President Donald Trump’s Health and Human Services Secretary, Robert F. Kennedy Jr, has rolled back official government vaccine recommendations and mandates, sparking widespread criticism. The US government reports that vaccine coverage among American kindergarteners has fallen below the threshold for herd immunity, making the virus more likely to spread and cause severe infections.
New cases continue to pop up, with several infected travellers passing through US airports, including Newark Liberty International Airport and Boston Logan International Airport. Australian authorities are also dealing with their own measles scare, after an infectious person visited Sydney Airport and multiple locations in the city’s west.
Experts stress that the key to containing the outbreak is vaccination. Dr Kate O’Brien, the WHO’s Director of Immunisation, Vaccines and Biologicals, says that two doses of vaccine provide 95% protection and that “no child needs to suffer the consequences of measles”. The Australian government recommends that children get inoculated against measles at 12 months of age and again at 18 months.
As the outbreak continues to spread, authorities urge the public to be vigilant and take precautions. Western Sydney Local Health District acting director of public health Conrad Moreira warns that symptoms can take up to 18 days to appear and that people who visited affected locations should be on the lookout for fever, sore eyes, runny nose, and a cough, usually followed by a red, blotchy rash.
The WHO identifies three factors driving the worldwide surge: “pandemic-era backsliding”, weak routine vaccination systems, and misinformation. Dr O’Brien stresses that parents need reliable information and a health system that can reach them, while Diana Chang-Blanc, head of the WHO’s Essential Program on Immunisation, warns that “a country is only protected when every child, everywhere, is fully immunised”.