Hidden within the soil in some prime agricultural areas of California is a fungus that can pose a serious health risk when soil is disturbed. Digging, trenching, equipment movement, and other similar activities can cause this fungus, Coccidioides Immitis, to go airborne. So can wind and dust storms.

When people breathe in the fungus, they are at risk of contracting Valley Fever—a disease whose symptoms mimic other common ailments.

Depending on the severity, those who contract Valley Fever will experience flu-like symptoms and will usually recover from it on their own. Unlike the flu, however, recovery can take weeks or months to complete, which could result in significant missed work time.

In more severe cases, pneumonia may develop, patients may suffer lung damage, or the disease can advance into disseminated Valley Fever where it spreads beyond the lungs to other organs.

What your employees need to know about Valley Fever

Avoid dust. Agriculture and construction workers are at significant risk for developing Valley Fever, because they are likely to face the greatest rate of dust exposure compared to other occupations. Your Injury and Illness Prevention Program (IIPP) should include control measures to reduce dust exposure.

The risk of exposure is greatest when digging begins. It doesn’t take long for the Coccidiodes immitis fungus to become airborne. The fungus lives in the top 2-to-12 inches of the soil so it’s likely to be released into the air when digging begins. And, the California Department of Public Health (CDPH) says there is no reliable way to test for it. In areas where Valley Fever is common, you should work under the assumption that Valley Fever spores may be present, and take precautions.

Get treated right away. Because symptoms are similar to other common illnesses, treatment is often delayed because the disease is not diagnosed right away. CDPH encourages anyone working in Valley Fever exposure areas to report any potential symptoms to a supervisor, and seek treatment from a physician right away.

What your employees need to do to minimize Valley Fever risk

While on the job, here are some steps to take:

  • Limit workers’ exposure to outdoor dust.
  • Use approved respiratory protection with particulate filters rated N95, N99, N100, P100, or HEPA. (These must be approved by NIOSH – the National Institute of Occupational Safety and Health – and are provided by the employer).
  • Use water, appropriate soil stabilizers, and/or revegetation to cut down on how much dust becomes airborne.
  • Minimize the area of soil to be disturbed.
  • Take precautions to isolate workers on the ground from heavy equipment and other dust generating processes.
  • Clean tools, equipment, and vehicles before transporting them off the worksite.
  • Bring a change of clothes to the jobsite and change into them after the workday ends. (Employers are encouraged to provide change rooms and showers whenever possible).
  • Controlling exposures through common dust control methods of enclosure, wet methods, and ventilation.
  • Ensure that earth moving equipment operators are in enclosed cabs with high efficiency air filtration and closed windows. Inspect door and filter seals.

Valley Fever information for your safety meeting

Discuss the symptoms of Valley Fever and remind workers that these symptoms are similar to other common illnesses. What may seem like the common cold could actually be something much worse.

CDPH has developed this guide to help you meet the training requirements under AB 203.

Some of those topics include:

  • Respirators – how to use them, how they work, how to put them on, and when it is safe to take them off.
  • The proper procedure for cleaning tools, equipment, and vehicles before leaving the job site.
  • How to use water and other dust control measures to cut down on the amount of soil that becomes airborne.

Exposure to airborne dust particles is unavoidable for agriculture and construction workers. But, by knowing what could be living within the soil and how serious the risk is if your workers breathe in those dust particles, you also know what actions to take to help provide a safe and effective workplace for your employees.

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The above evaluations and/or recommendations are for general guidance only and should not be relied upon for medical advice or legal compliance purposes. They are based solely on the information provided to us and relate only to those conditions specifically discussed. We do not make any warranty, expressed or implied, that your workplace is safe or healthful or that it complies with all laws, regulations or standards.

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