5 Tick Infested Areas In South Australia

At Innes National Park, a year-long tick study found ornate kangaroo tick larvae peaking in March, nymphs in September, and adults in November, showing how strongly tick activity can shift with the seasons in South Australia. The ornate kangaroo tick has an established population on southern Yorke Peninsula, while the southern reptile tick occurs in southeastern coastal parts of the state. South Australia has several well-documented pockets of tick activity, particularly where native reptiles and kangaroos provide reliable hosts. The most clearly documented tick-borne illness is Flinders Island spotted fever, caused by Rickettsia honei and associated with the southern reptile tick. The locations below are not simply places where ticks might occur, but areas where researchers have documented tick populations, hosts, seasonal patterns, or disease connections.

West Cape Lighthouse, part of the Innes National Park at Yorke Peninsula. Image by Adam_photos via Shutterstock. Located on the southern Yorke Peninsula, about 250 kilometers northwest of Adelaide, Innes National Park is one of South Australia’s best-documented areas for the ornate kangaroo tick (Amblyomma triguttatum). Researchers surveyed four sites throughout 2006 and found adult ticks from January to February and August through December, with numbers peaking in November. Larvae were collected from February to August, with the highest abundance in March, and nymphs were found in autumn and spring.

The tick’s distribution is closely associated with western grey kangaroos, an important host, and researchers found it across multiple habitats in the park, with particularly high numbers in disturbed areas around camping sites. The ornate kangaroo tick is an enzootic vector of Coxiella burnetii. This bacterium causes Q fever, although people generally contract Q fever by inhaling contaminated material from infected animals rather than directly from tick bites. For residents, the seasonal data is worth noting: March produced the study’s highest larval count, while September had the highest nymph count.

Yorke Peninsula, South Australia. In the Southern Yorke Peninsula, near Innes National Park, Warrenben Conservation Park is another confirmed South Australian location for the ornate kangaroo tick (Amblyomma triguttatum). A distribution study found free-living ornate kangaroo ticks in both Warrenben Conservation Park and nearby Innes National Park. In contrast, researchers did not find free-living populations outside those two parks during their survey.

The tick was patchily distributed across at least eight of the 15 habitats examined. Its concentration in disturbed areas around camping sites is particularly relevant because those locations overlap with places where people spend time outdoors. Western grey kangaroos are considered the tick’s principal host, and the species was also collected from rabbits, black rats, dogs, cats, and humans during host surveys on southern Yorke Peninsula.

The main disease connection is Q fever: A. triguttatum is an important enzootic vector of Coxiella burnetii in Australia. However, that should not be presented as evidence that tick bites are the primary means by which South Australians contract Q fever. The documented concern at Warrenben is the combination of an established tick population, wildlife hosts, and human activity in the same habitat.

Fleurieu Peninsula Drone Shot of Beach. Image by Cameron Prior via Shutterstock. Deep Creek National Park and several other conservation areas lie on the Fleurieu Peninsula south of Adelaide. The Fleurieu Peninsula falls within the known distribution of the southern reptile tick (Bothriocroton hydrosauri) in south-eastern South Australia. The Australian Centre for Disease Control lists southeastern South Australia near Adelaide among the ticks’ known distribution areas, and researchers have specifically investigated tick and rickettsia populations on the Fleurieu Peninsula.

The southern reptile tick primarily parasitizes reptiles, making areas with abundant lizards and other reptiles particularly relevant. It occasionally bites humans. This is a concern because the tick could carry Rickettsia honei, the bacterium that causes Flinders Island spotted fever. This area has an unusually strong connection to disease. Multiple cases of spotted fever group rickettsiosis occurred along South Australia’s southern coast between 2001 and 2003, including infections in which R. honei was identified.

Red Banks Beach, Arno Bay, South Australia. Image by Chillodi via Shutterstock. The northeastern Eyre Peninsula, particularly around Arno Bay on the Spencer Gulf coast, is included in the broader South Australian distribution of the southern reptile tick (Bothriocroton hydrosauri). The Australian Centre for Disease Control lists the Eyre Peninsula among the species’ established distribution areas in South Australia.

Arno Bay is especially useful as a documented research location rather than simply an area where ticks are assumed to occur. Research on the northeastern Eyre Peninsula has examined the boundary between two reptile ticks, Amblyomma albolimbatum and Amblyomma limbatum, whose ranges meet in this part of South Australia. The research documented both A. albolimbatum and A. limbatum on reptile hosts. While the presence of A. albolimbatum is ecologically significant, it has not been associated with a locally documented human tick-borne disease.

A sleepy lizard (Tiliqua rugosa) studied in Bundey Bore and Mount Mary, South Australia. Image by Robyn Jay from Sydney, Australia, CC BY-SA 2.0, via Wikimedia Commons. Mid-north South Australia, roughly halfway between Burra and Morgan and about 150 kilometers northeast of Adelaide, Bundey Bore and nearby Mount Mary are among the most intensively studied tick habitats in South Australia. More than 55,000 reptile records have been collected through long-running research in the area, providing unusually detailed information about local tick populations.

Two species meet in this landscape: the southern reptile tick (Bothriocroton hydrosauri) and the lizard tick (Amblyomma limbatum). At Bundey Bore, A. limbatum occurs toward the northeast while B. Hydrosauri occur toward the southwest, with the boundary between them shifting over time. Both species are associated with the sleepy lizard (Tiliqua rugosa), which provides an important host.

The habitat is semi-arid, with hot, dry summers and cooler, wetter winters. Researchers found that climate, previous tick abundance, and sleepy-lizard abundance together explained substantial variation in tick numbers, demonstrating that moisture and seasonal conditions can strongly influence local populations. Of the two species, B. hydrosauri poses the clearest human disease concern because it is the vector for Flinders Island spotted fever.

South Australia’s tick risk is concentrated in particular habitats rather than evenly distributed across the state. The strongest documented areas include the southern Yorke Peninsula, southeastern South Australia, and the long-studied mid-north tick boundary around Bundey Bore and Mount Mary. The Australian Centre for Disease Control recommends preventing tick bites and seeking medical advice if significant symptoms develop after an exposure, particularly fever, rash, or other illness consistent with a tick-borne infection.