As much of the world continues to focus on COVID-19 and other respiratory diseases, another deadly lung infection is growing quietly in San Luis Obispo (SLO) County, California — one that concerns public health experts. Valley fever, a fungal infection native to the western United States, reported a record-setting surge in 2024, and health authorities caution that the outbreak may spread further in months to come.With 482 cases already this year alone — close to twice the 244 cases in 2023 — Valley fever is now an SLO County public health priority. Experts say early detection, protective gear, and heightened awareness are key to curtailing its spread.What Is Valley Fever and Why Are Cases Increasing?Valley fever, or coccidioidomycosis, is a lung infection caused by the inhalation of spores of the Coccidioides fungus, which occurs in soil throughout the southwestern United States. The disease is not contagious, but it's being found more and more among residents and employees in areas with dry climates and disturbed soil.Epidemiologist Jessie Burmester of the SLO County Public Health Department pointed out that 2024 has already beaten the county's 10-year mean of 220 yearly cases. "We do anticipate these 240-plus cases to continue to increase as we enter fall and winter," she said. That's because while infection tends to take place during summer, symptoms can be lagged behind — appearing weeks or even months following the inhaled spores.".One particularly concerning trend has developed: an increasing number of residents are getting sick after intense weather patterns, such as years of drought punctuated by torrential rains. The rainy winters in California during the past two years have probably initiated fungal blooms that raise the spore concentration in the soil — and consequently, in the air.Who Is Most at Risk?While anyone can develop Valley fever, there are certain populations that are particularly susceptible. Based on Burmester, individuals who are working in dusty settings — i.e., construction workers and farmers — are more exposed to occupational hazard, especially if they are working near the ground. Those engaged in root crops or digging come into direct contact with the dirt that may be infected with the fungus.Some other high-risk groups include:Adults older than 60 years oldPregnant womenIndividuals with compromised immune systems or chronic diseasesEven family pets are vulnerable, as they too can breathe in the spores from infected soil or dust.Valley Fever SymptomsPart of the reason Valley fever is underdiagnosed is that its symptoms are very similar to those of the flu or even COVID-19. These can include:FatigueHeadacheCough that lastsShortness of breathFeverBurmester clarified that 60% of people infected with Valley Fever do not show symptoms, making it even tougher to monitor and control the outbreak. Of those who become symptomatic, the majority recover on their own without any medical treatment. But as many as 1% can develop serious complications, such as the spread of the infection to other organs — a condition that can be treated for life and, in the worst-case scenario, is fatal.Diagnosing and Treating Valley FeverDue to the co-morbidity with other respiratory diseases, adequate testing is needed. A conclusive diagnosis usually calls for a blood test or a chest X-ray. Health Officer Dr. Penny Borenstein asked residents to visit medical evaluation if they develop flu-like symptoms lasting longer than a few weeks.“Ask your healthcare provider to test for Valley fever,” she advised. “This increase is not unexpected… and we’re working to ensure our healthcare providers and community know how to reduce your risk.”Most mild cases resolve on their own. In moderate to severe cases, antifungal medication is prescribed to reduce the severity and prevent complications.Why Now? The Environmental Link to Valley FeverValley fever has been known for decades to surge in arid, dusty areas. Yet research in recent years has indicated a more complex correlation between climate and rates of infection. In California, drought cycles punctuated by wet seasons of a fierce intensity make for optimal growth of the Coccidioides fungus. When dry weather resumes, disrupted soil puts spores into the air, and individuals are more likely to breathe them in.California experienced its record-high statewide Valley fever case load in 2023 with 9,280 cases reported, setting the stage for higher numbers in 2024.Prevention Tips to Keep Yourself SafeWhile Valley fever cannot be spread from person to person, prevention is still achievable. The SLO County Public Health Department has offered a number of precautions:Steer clear of dusty outdoor spaces, particularly windy days.Roll up car windows when driving in rural or construction areas.Operate your vehicle's air conditioning in recirculate mode to prevent bringing in tainted outside air.Wear an N95 mask if working outside and moisten the soil before digging.Try to minimize contact with activities that break up the soil, especially during high-risk seasons.Public health officials are emphasizing the necessity of continued surveillance, public awareness, and health care provider education to stem the tide of rising Valley fever cases in SLO County. Early detection and diagnosis are essential as we move into fall and winter — the prime diagnostic season."Individuals need to become empowered to demand a Valley fever test," said Burmester. "Awareness is the first step to protecting yourself."With evolving climate patterns and an increased population of at-risk individuals, Valley fever can become a permanence — but with knowledge may make all the difference.