Sydney’s 1789 smallpox epidemic came from the First Fleet and killed up to 220,000 Indigenous Australians: new research

In April 1789, just 16 months after the arrival of the First Fleet in New South Wales, the first recorded smallpox epidemic broke out among the Indigenous peoples of the Sydney region. This outbreak marked one of the earliest instances of infectious disease devastation in Australian history, and according to recent research, it originated from the European settlers rather than from earlier contact with other groups such as the Makassan traders from Indonesia. The findings, published in Nature Human Behaviour, challenge long-held historical narratives and provide a clearer picture of how the disease spread and its impact on Indigenous communities. Historians have often debated whether the smallpox epidemic of 1789 was introduced by the British or by earlier visitors to the region. One theory suggested that the disease had already reached northern Australia before the British arrived, possibly via Makassan traders who had been visiting the area for centuries. However, the new study argues that this scenario is implausible due to the geographical and temporal constraints of human mobility at the time. The researchers developed a detailed model based on the transmission dynamics of smallpox and the existing social networks of Indigenous Australians, which showed that the disease could not have traveled from the north to Sydney quickly enough to cause the 1789 outbreak. The research team considered multiple factors, including the patterns of movement and interaction among Indigenous communities prior to colonization. These movements were primarily along coastal routes and major river systems, driven by the need for water, food, trade, and ceremonial purposes. Given these limitations, the model concluded that the disease must have originated closer to Sydney, likely within the British settlement itself. The possibility remains that the smallpox virus was introduced either through accidental release of "variola matter" — infected biological samples brought by the colonists for potential inoculation — or through direct contact with sick individuals from the First Fleet. Smallpox has historically been one of the deadliest infectious diseases, causing widespread mortality and severe physical disfigurement in those who survived. Before the 20th century, it claimed millions of lives globally, particularly among populations without prior exposure. For Indigenous peoples around the world, the introduction of smallpox by European explorers and settlers was catastrophic. In North America, for example, the disease played a significant role in decimating Native American populations following initial contact with Europeans in the 16th century. Similarly, in Australia, the lack of immunity among Indigenous people made them extremely vulnerable to the disease's effects. The 1789 epidemic is believed to have lasted for several decades and resulted in the deaths of up to 220,000 Indigenous Australians. While exact figures remain uncertain due to limited historical records, the scale of the impact is clear. The disease spread rapidly along the eastern seaboard and into inland regions, but it did not reach all parts of the continent. The researchers note that the geographic extent of the outbreak was constrained by the movement patterns of Indigenous people at the time. The implications of this research extend beyond academic interest. Understanding the origins and spread of the 1789 smallpox epidemic provides critical insights into the broader history of colonization and its health consequences. It highlights the profound and often overlooked impact of infectious diseases on Indigenous populations and underscores the importance of recognizing the complex interplay between disease, migration, and cultural contact in shaping historical outcomes. As further studies continue to explore the genetic and epidemiological aspects of this event, the findings will contribute to a more comprehensive understanding of Australia's colonial past and its enduring legacy.