Home » Health » Valley fever, a serious and sometimes fatal respiratory disease caused by the fungus Coccidioides, is expanding from its traditional Southwest hotbed and, if present trends continue, will increasingly threaten more of the American West. Infections, triggered by breathing outdoor air in endemic areas, are linked to dust storms and disturbances to soil associated with construction, agriculture and fire-fighting. Estimates of the true annual US incidence of valley fever place it at upward of 350,000 cases, 17 times more than the official records of about 20,000 cases reported to the Centers for Disease Control and Prevention in 2019.

Valley fever, a serious and sometimes fatal respiratory disease caused by the fungus Coccidioides, is expanding from its traditional Southwest hotbed and, if present trends continue, will increasingly threaten more of the American West. Infections, triggered by breathing outdoor air in endemic areas, are linked to dust storms and disturbances to soil associated with construction, agriculture and fire-fighting. Estimates of the true annual US incidence of valley fever place it at upward of 350,000 cases, 17 times more than the official records of about 20,000 cases reported to the Centers for Disease Control and Prevention in 2019.

Dust is often seen as an innocuous nuisance, something that requires regular cleaning but poses little threat beyond clogging up the vacuum filter. However, recent research has revealed a more sinister side to the dust we encounter every day. It turns out that the particles we breathe in may contain a host of harmful substances, including dangerous chemicals and even biological agents. In this article, we’ll take a closer look at the devil lurking in the dust, and explore what you can do to protect yourself and your family from its harmful effects.


Valley fever, also known as coccidioidomycosis, is a fungal infection that can be fatal in humans and animals, ranging from flu-like illness to pneumonia or meningitis. The fungus causing the disease, Coccidioides, spreads through dry soil and dust storms in hot and arid climates. Researchers estimate that by 2095, the areas where people will be most susceptible to Valley fever will more than double, expanding to almost the entire Western half of the US. Climate change is a major factor fuelling the spread, as the contracting Colorado River and the reservoirs it feeds in states like Arizona and California are leading to a dustier environment. Human activities such as construction projects also disrupt soil and spread fungal spores. Although infections are still rare, health experts predict climate change will drive cases up threefold over the next 50 years.

Scientists have been studying this fungus for decades, but how it spreads through soil, and why it often appears in small rodents, remains a mystery. Although researchers acknowledge that rodents carry the infection in areas where the fungus is endemic, the exact link between rodents and the fungus’s presence in soil requires further investigation. Unlike respiratory diseases where fresh air is often key to preventing infections, all a person needs to do to get Valley fever is breathe outdoor air in an endemic area. People who work outdoors and are exposed to soil are at the highest risk, including construction workers, wildland firefighters, agricultural workers, and archaeologists. Cocci can cause disease in both immunocompromised patients and individuals with healthy immune systems.

Maintaining awareness of this disease is crucial, as undercounting Valley fever cases and deaths have resulted in public health authorities struggling to create an accurate map to show where the fungus is lurking. Current medical practices also do not consider it as a primary diagnosis, leading to further underreporting of cases. However, a growing community of scientists is working to build something similar to a real-time map with the aim of alerting both the general public and health care providers to the risk that poses.

As climate-driven changes to the soil accelerate the fungus’s life cycle, scientists are urging public health authorities to take action. Although vaccination against this disease is not yet possible, increased awareness, early diagnosis, and better healthcare could help control the spread of the disease. Despite the looming threat that seems to be moving too fast to outrun, scientists are hopeful that with more research, they can develop better approaches to mitigate the spread of Valley fever.


In conclusion, it’s eerie to think that something as seemingly innocent as dust could harbor so much danger. But it’s important to remember that knowledge is power, and with the right precautions, you can protect yourself and your loved ones from the devil lurking in the dust. So the next time you reach for that feather duster or vacuum cleaner, remember to wear a mask and gloves, and try to keep your living space as clean and dust-free as possible. By doing so, you’ll not only keep the dust devil at bay, but you’ll create a healthier living environment for yourself and your family. Stay safe and stay informed.

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