Australia is experiencing its largest diphtheria outbreak in living memory, with the highly contagious bacterial disease spreading primarily through remote Indigenous communities across the Northern Territory and other parts of northern Australia.

Once nearly eradicated thanks to vaccination programmes, diphtheria has re-emerged as a concerning public health issue, often described as a 'disease of poverty' linked to inadequate housing, limited access to sanitation, and lower vaccination rates in these areas.

Health authorities have reported over 220 cases in 2026 so far, with the overwhelming majority affecting Aboriginal and Torres Strait Islander people living in remote and very remote regions.The bacterial infection can cause severe respiratory issues, skin problems, and in rare cases, be life-threatening if not treated promptly.

Experts highlight systemic inequalities, including overcrowded living conditions and insufficient health infrastructure, as key factors driving the spread.

In response, governments have announced funding packages to boost vaccination efforts, improve clinic resources, and support community health initiatives.

Indigenous affairs reporters and correspondents emphasise the need for urgent action to address these gaps in the 'Closing the Gap' framework.

While one possible death has been linked to the outbreak, efforts are underway to contain it through targeted immunisation drives and better hygiene resources in affected communities.This situation underscores broader challenges in delivering equitable healthcare to remote Indigenous populations in modern Australia.