Fungus Storms: An Emerging Concern

It might sound like a plot from a sci-fi movie: unseen clouds of fungal spores traveling vast distances, entering lungs, and leading to illness. However, the reality is somewhat less fanciful but undeniably serious. A fungus storm occurs when strong winds lift microscopic spores from fungi, along with other tiny organisms and particles, often carrying them over long distances.

Research suggests that climate change is contributing to the increased frequency of such extreme weather phenomena, while also enabling certain fungi to adapt and spread to new regions. These fungi remain mostly invisible to our eyes, yet they can have significant health implications.

Are Fungus Storms a Concern?

Definitely. Two types of soil-dwelling fungi—Coccidioides immitis and C. posadasii—are responsible for a condition known as valley fever in the U.S. A study noted a clear link between the rise in windborne dust storms and the increasing cases of valley fever, which saw an alarming 800 percent increase from 2000 to 2011 as dust storms rose by 240 percent in recent years.

Understanding Valley Fever

Valley fever can be serious. Each year, approximately 10,000 cases are reported, primarily in Arizona, where about 70 percent of cases occur. Interestingly, around 60 percent of those exposed to Coccidioides spores don’t become ill. For those who do, symptoms can range from extreme fatigue and coughing to fever and muscle aches. Up to 10 percent may face long-term lung damage, and in rare cases, the infection could spread to the brain and spinal cord. In California and Arizona, around 160 fatalities are attributed to this condition annually.

Consequences of Valley Fever

Consider the case of a British jeweler who, while attending a gem fair in Tucson, developed valley fever. The aftermath was severe; part of his lung had to be removed along with a mass of Coccidioides the size of a golf ball. Now, everyday activities can leave him breathless, and he struggles with persistent fatigue and body aches. Yet experts say it’s important to maintain perspective—spending a year in an area with Coccidioides gives you about a 3 percent chance of getting infected, and only a 1 percent chance of becoming seriously ill. Those in farm or construction jobs tend to be at greater risk.

Why is it Called Valley Fever?

The term emerged around the late 19th century when cases began spiking in the San Joaquin Valley. This region, known for its role in John Steinbeck’s classic novel The Grapes of Wrath, saw infections rise notably after an earthquake. While antifungal medications can alleviate symptoms, there remains no permanent cure.

Other Dangerous Fungi

Yes. Three species from the Aspergillus genus, commonly recognized as molds, are also spread by dust storms. Increasing humidity and extreme weather events linked to climate change may elevate infection risks in Europe as well. The World Health Organization has recently prioritized Aspergillus as an emerging threat. Similar to valley fever, while many people may encounter it without issue, those who fall ill experience symptoms such as cough, shortness of breath, and fatigue. Individuals with weakened immunity are particularly vulnerable.

Are Spores Limited to Dry Areas?

Not at all. Research has found spores from both the Ascomycota and Basidiomycota groups—familiar types that include some edible mushrooms—can be found in air masses over a broad area, extending from the Pacific Northwest to the Arctic. These spores can influence the formation of water droplets and ice in clouds, affecting precipitation patterns.

The Economic Impact of Fungus Storms

Dust storms, we know, come with large financial costs. Reports indicate that dust storms in North Africa and the Middle East incur over £100 billion annually, while the U.S. experienced a similar rise in costs associated with erosion and dust damage over the last two decades. This economic burden includes property damage and infrastructure costs, but the health impacts from fungal spores will also add to this total.

Other Fungal Infections to Note

Regrettably, yes. Histoplasmosis, caused by a fungus that thrives in bird and bat droppings, is also a concern. It’s prevalent in the midwestern U.S., but found worldwide except Antarctica. Many who contract it will not show symptoms, but those who do can experience fever, cough, headaches, and fatigue. For those with compromised immune systems, the effects can be much more severe, leading to acute respiratory issues.

Other Fungal Threats

Another condition called blastomycosis arises from fungi found in damp soils near woods and waterways. It’s rare, with only around 40 people and 120 pets diagnosed in Minnesota annually; though these figures appear to be climbing. This pathogen is contracted through inhaling spores from the soil, so it’s unlikely connected to storms. About half of infections are asymptomatic or mild.