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Cases of Valley Fever on the rise

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Posted: Friday, June 1, 2012 12:00 am

County officials educate residents on the causes, effects of the disease

By News-Sentinel Staff

The rate of Valley Fever in San Joaquin County was five times higher in 2011 than in 2009, and Public Health Services wants residents to understand the cause and symptoms of the disease, as exposure is most common in the summer months.

The increase in the number of reported cases is a growing concern to local public health officials. San Joaquin County Public Health Services recorded 27 cases of Valley Fever in 2009, 46 in 2010, and 123 in 2011. To date this year, there have been 51 reported cases, according to county data.

What is Valley Fever?

The disease is caused by a fungus that lives in the soil, primarily in the southwestern United States and northern Mexico. In addition to California, Arizona, New Mexico and Nevada have seen high rates.

People are exposed when the fungal spores become airborne and are inhaled into the lungs. These spores can get into the air when dirt is disturbed by humans or nature such as when digging, during construction, or from strong winds and dust clouds.

In California the cocci fungus is predominantly found in the San Joaquin Valley, with the highest levels in the southern valley. For San Joaquin County, the highest rates are found in Tracy.

What are the symptoms?

Approximately 60 percent of people infected do not develop any symptoms. Others develop symptoms one to three weeks after getting exposed.

The disease usually affects the lungs, causing symptoms of flu or pneumonia including extreme tiredness, fever, body aches, pains, cough and rash. Most people's acute symptoms resolve in about a month, but full energy takes several months to return. In some people, the disease spreads to other parts of the body such as the bones, skin, joints or brain. In these cases, the disease is very serious and may even be fatal.

Who gets Valley Fever? Illness may occur in residents or visitors in an infected area. People most likely to be exposed are those working outside in dusty occupations, such as farmers, construction workers, archaeologists or others who breathe in dust from the dirt in areas where there are fungal spores. This may include exposures while gardening or driving off-road vehicles, for example.

Those between the ages of 25 and 55 are most likely to develop symptoms of the disease, although people of all ages can have symptoms.

Who is most susceptible?

According to the Center for Disease Control and Prevention, groups at higher risk for severe disease include pregnant women, older persons and those with impaired immune systems such as people with diabetes, cancer or HIV, or those on immunosuppressive medications.

The rate of disseminated disease also appears to be higher in blacks, Filipinos and possibly Hispanics. In most cases, people who are exposed develop immunity.

How is Valley Fever diagnosed?

Increased knowledge about the disease may lead to early diagnosis and treatment that could help prevent complications.

A diagnosis is made either through a culture of the cocci organism from a person's body fluid or tissue specimen, or by a blood test that shows the body's immune response to the presence of the fungus in the body. Chest X-rays may also be used to detect changes in the lungs.

What is the treatment?

For people with the flu-like symptoms of Valley Fever, doctors may treat the symptoms and recommend bedrest. For more severe cases, a number of medications are now available. Occasionally surgery is recommended to remove a diseased portion of the lung, bone or skin.

How can Valley Fever be prevented?

Currently, there is no vaccine to prevent Valley Fever. The infection is not spread from person to person or from animals to people.

Persons at risk for Valley Fever should avoid exposure to dusty air in areas where the fungus is common. The risk for exposure to the cocci spores are highest during the dry months of the summer and fall.

Those exposed to dust during their jobs or other outside activities should consider using respiratory protection, such as wearing a close-fitting dust mask. Early recognition of symptoms and seeking prompt medical care is important.

For more information

Visit the California Department of Public Health at www.cdph.ca.gov of call the county's Communicable Disease Program at 209-468-3822.

Information can also be obtained by calling your local American Lung Association at 800-LUNG-USA or visiting www.lung.org.

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