Lyla Lindsey
White-nose syndrome (WNS) is a fungal disease that has killed millions of hibernating bats in North America. The disease is caused by the fungus Pseudogymnoascus destructans, which grows on the muzzles and other body parts of infected bats. Since its discovery in New York in 2006, WNS has spread to most US states and Canadian provinces, causing unprecedented declines in bat populations. While WNS has not yet been found in Australia, the movement of cavers and other visitors between affected caves in North America and Australia poses a significant risk of introducing the disease to the country. Australian authorities have developed guidelines to assist response agencies in the event of an incursion and are working to raise awareness among cavers and those working with hibernating bats to prevent the introduction of WNS into Australia.
| Characteristics | Values |
|---|---|
| White-nose syndrome (WNS) | A fungal disease that kills hibernating bats |
| Fungus name | Pseudogymnoascus destructans (Pd) |
| Origin | Europe or Asia |
| Current spread | North America, Europe, and China |
| Australia's status | Free of WNS |
| Risk of introduction to Australia | High due to the movement of cavers and other people (researchers, karst managers, tourists) between affected regions and Australia |
| Reporting suspected cases in Australia | Emergency Animal Disease Hotline: 1800 675 888 |
| Key signs | Visible white fungus, especially on the bat's nose; abnormal behavior, such as erratic flying or flying outside during the day |
| Human infection risk | No documented cases; WNS does not cause illness in humans |
| Impact on humans | Indirect effects include increased insecticide use on crops, associated with higher infant mortality rates |
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What You'll Learn
- White-nose syndrome (WNS) is a fungal disease that kills hibernating bats
- WNS is caused by the fungus Pseudogymnoascus destructans (Pd)
- WNS has not been found in Australia, but it poses a serious risk
- International cavers visiting Australia increase the risk of introducing WNS
- Guidelines are being developed to assist response agencies if WNS is introduced
White-nose syndrome (WNS) is a fungal disease that kills hibernating bats
White-nose syndrome (WNS) is a fungal disease that has killed millions of hibernating bats across North America. The disease was first identified in New York in 2006 and has since spread to most US states and Canadian provinces. WNS is caused by the fungus Pseudogymnoascus destructans (Pd), which grows on the muzzles and other body parts of infected bats. Pd is believed to have originated in Europe or Asia and was likely introduced to North America through human activities such as the international movement of contaminated clothing and caving gear.
WNS poses a serious threat to bat populations in Australia. The fungus that causes WNS has been found in various parts of the world, including Europe and China, and can easily be spread to Australia through human activities. International cavers visiting Australia, including researchers, karst managers, and tourists, are considered a potential source of introducing WNS into the country. To prevent the incursion of WNS, Australian cavers and those working with hibernated bats are advised to report any suspected cases to the Emergency Animal Disease Hotline. Visible white fungus, particularly on the bat's nose, is one of the key signs of WNS infection.
The potential impact of WNS on Australian bats is being studied by researchers at Western Sydney University, Taronga Conservation Society Australia, and other institutions. They are developing predictive models to assess the vulnerability of Australian bat populations to WNS and to guide actions to prevent, detect, and mitigate the impacts of this disease. The expected outcomes include species-specific models of vulnerability to WNS for bat populations across south-eastern Australia.
Additionally, guidelines have been developed by Wildlife Health Australia in collaboration with stakeholder groups to assist response agencies in the event of an incursion of WNS into the country. These guidelines aim to reduce the risk of introduction and better prepare Australia in case the disease is found in the future. While WNS does not cause illness in humans, the decline in bat populations can indirectly affect human health. Bats play a crucial role in controlling pest insects, and their loss can lead to increased insecticide use on crops, which has been associated with higher infant mortality rates.
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WNS is caused by the fungus Pseudogymnoascus destructans (Pd)
White-nose syndrome (WNS) is caused by the fungus Pseudogymnoascus destructans (Pd). This fungus is psychrophilic, meaning it thrives in cold and humid environments, particularly those between 4°C and 20°C. It is within this temperature range that bats typically overwinter in hibernacula, underground caves, or mines. The fungus grows on the nose, wings, and ears of bats during hibernation, causing a white fuzz to appear on the host's nose—the characteristic sign of WNS. It may also be visible on the bat's wings, ears, or tail in the form of lesions and scarring.
Pd grows optimally between 12.5 and 15.8°C, with an upper growth limit of approximately 20°C. It reproduces asexually through the formation of uniquely curved conidia, which can occur singly or in short chains at the tips or sides of the fungus. Pd grows very slowly on artificial media, and its growth rate varies across different isolates. The spread of Pd is facilitated by bat-to-bat transmission, environmental factors, and human activities such as recreational caving and research.
The syndrome has devastating consequences for bat populations, with a mortality rate as high as 90-100%. Bats are believed to die from WNS due to starvation and the loss of fluids and electrolytes across damaged wing membranes. The fungus causes infected bats to arouse more frequently and earlier than usual during hibernation, burning through their vital fat reserves. This may lead them to leave their hibernacula prematurely in search of food, which is often scarce during winter, ultimately resulting in their death.
Research has identified various compounds that can effectively inhibit the growth of Pd, including antifungals, fungicides, and biocides. These compounds, along with ongoing investigations into vaccines, antifungal chemicals, and modifications to hibernation habitats, offer potential strategies to combat the spread of WNS and protect bat populations.
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WNS has not been found in Australia, but it poses a serious risk
White-nose syndrome (WNS) is a fungal disease that has killed millions of hibernating bats across North America since it was first discovered in New York in 2006. The disease is caused by the fungus Pseudogymnoascus destructans (Pd), which grows on the muzzles and other body parts of infected bats. WNS has not been found in Australia, but it poses a serious risk to the country's bat population.
The introduction of WNS into Australia could have catastrophic consequences for the country's bat fauna. Bats play an essential role in maintaining a healthy ecosystem, as they control pest insect populations. A study found that in countries affected by WNS, insecticide use on crops increased by about 30%, leading to a nearly 8% increase in infant mortality rates. Therefore, the potential impact of WNS in Australia extends beyond just the bat population.
International cavers and researchers visiting Australia pose a significant risk of introducing WNS into the country. The fungus that causes WNS has been found in various parts of the world, including Europe, Asia, and China. As a result, even if people have not visited caves in North America, their gear and clothing could still be contaminated with the fungus. Australia's unique bat species are particularly vulnerable to WNS, and the disease could cause rapid and severe population declines if it is introduced into the country.
To mitigate the risk of WNS being introduced into Australia, guidelines have been developed to assist response agencies and raise awareness among those who come into contact with bats, such as cavers, researchers, and park rangers. These guidelines include decontamination protocols for clothing and equipment, as well as instructions on reporting suspected cases of WNS. By implementing these measures, Australia aims to reduce the likelihood of WNS entering the country and protect its bat populations from this devastating disease.
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International cavers visiting Australia increase the risk of introducing WNS
White-nose syndrome (WNS), a fast-spreading disease that has killed millions of bats across the United States and Canada, is a serious biosecurity issue for Australia. The disease affects the ability of cave-dwelling bats to hibernate, causing dehydration and death. As of 2017, Australia is free of WNS, but the country is not taking any chances. Organisers of the International Congress of Speleology, held in Sydney that year, worked with authorities to minimise the risk of introducing the disease to the country.
International cavers visiting Australia represent a risk for the introduction of WNS. The fungus that causes the disease can spread between caves by surviving on clothing, footwear, and caving gear. It is believed that the fungus was introduced to North America from Europe via international travellers carrying contaminated equipment. Australian cavers travelling abroad also have a role in preventing the introduction of WNS to their home country by complying with cleaning protocols to decontaminate gear before and after field trips.
In Australia, response agencies are developing guidelines to prepare for and manage the potential introduction of WNS. Wildlife Health Australia has developed White-Nose Syndrome Response Guidelines in consultation with stakeholder groups to assist response agencies in the event of an incursion of the disease into the country's bat population. These guidelines are designed to help agencies like Wildlife Health Australia, as well as bat and wildlife carers, ecologists, researchers, cavers, cave managers, park rangers, and members of the public, to respond effectively to the threat of WNS.
Australian cavers and those working with hibernating bats are advised to be aware of WNS and report any suspected cases to the Emergency Animal Disease Hotline. The caving community in Australia is on high alert, with university researchers conducting risk assessments to better understand the threat WNS poses to the country's bat populations.
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Guidelines are being developed to assist response agencies if WNS is introduced
White-nose syndrome (WNS) is an exotic disease that has not yet been found in Australia. However, guidelines are being developed to assist response agencies in the event of its introduction. These guidelines are being developed by Wildlife Health Australia in consultation with stakeholder groups, including the ABS. The aim is to protect Australian bats and reduce the risk of WNS being introduced into the country.
The response guidelines will provide information on WNS for people in Australia who may come into contact with microbats, such as bat/wildlife carers, ecologists, researchers, students, cavers, cave managers, park rangers, and members of the public. These guidelines will ensure that everyone knows how to report a suspected case of WNS and how to respond effectively to prevent its spread.
To reduce the risk of WNS being introduced into Australia, Wildlife Health Australia, with funding from the Department of Agriculture and Water Resources, commissioned a disease risk assessment. This report was prepared by a team of experts led by the University of Melbourne in collaboration with the South Australian Museum, DELWP (Arthur Rylah Institute) Victoria, and the University of Adelaide. The risk assessment considered the potential impact of WNS on Australian bat populations and the likelihood of its introduction.
Based on the findings of the risk assessment, the guidelines will be further refined and updated to ensure they are effective and practical. They will provide clear instructions on how to identify, contain, and manage an outbreak of WNS in Australia. This includes surveillance and monitoring, reporting and response protocols, and strategies to minimise the impact on bat populations and the environment.
Overall, these guidelines are a crucial part of Australia's preparedness for WNS and will help ensure a rapid and coordinated response if the disease is ever introduced. By involving stakeholders and experts in their development, the guidelines will be comprehensive and tailored to the unique context of Australia's bat populations and ecosystems.
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Frequently asked questions
White Nose Syndrome (WNS) is a fungal disease that has killed millions of hibernating bats in North America. The fungus, Pseudogymnoascus destructans, grows on the muzzle and other parts of infected bats.
No, Australia is currently free of White Nose Syndrome. However, it is thought that the movement of cavers and other people between affected caves in North America and Australia could introduce the disease to the country.
The Australian government has implemented cleaning protocols for personal gear and clothing to decontaminate them before and after field trips. There are also guidelines for reporting suspected cases of WNS to the Emergency Animal Disease Hotline.
Visible white fungus, particularly on the bat's nose, is a key sign of WNS. Bats infected with WNS may also exhibit unusual behaviour, such as erratic flying, which can increase the risk of bat-human contact.
No, White Nose Syndrome does not cause illness in humans. However, declines in bat populations can indirectly impact human health, as bats play an important role in controlling pest insects.
