Tennessee health officials are tracking an outbreak of histoplasmosis after more than 35 cases showed up in Maury and Williamson counties over a three-month span. The fungus behind it comes from soil tainted with bird or bat droppings and spreads when people inhale microscopic spores. Authorities are investigating, some patients are hospitalized, and doctors emphasize testing and awareness for anyone with lingering respiratory symptoms.
Local health data presented in mid-January flagged this cluster, and officials say they have not yet proven the infection caused any deaths. A family has reported that one woman tested positive for histoplasmosis two days after she died, but state epidemiologists are still working to link outcomes to the illness. The average age among confirmed cases is around 50, suggesting this is affecting middle-aged adults in the area.
Histoplasma capsulatum lives in soil enriched with bird or bat droppings, and people typically get infected by breathing in spores stirred up during outdoor activities. The fungus is not contagious from person to person; exposure usually happens at sites with heavy droppings like caves, old barns, or places where birds roost. Investigators have not yet traced the Tennessee cluster to a single source.
Most people exposed to the spores never get sick, and infections may be mild or go unnoticed, which makes detection tricky. When illness does occur, symptoms can range from a mild cough to severe respiratory distress, and they usually show up three to 17 days after exposure. Because the early signs mimic common viruses, histoplasmosis often slips past initial diagnoses.
Typical symptoms include fever, cough, extreme fatigue, headache, body aches, chills and chest pain, which overlap heavily with cold and flu complaints. That overlap can delay the right tests and treatment unless clinicians consider a fungal cause in patients who aren’t improving. New antigen tests approved by the CDC can speed diagnosis when doctors think to use them.
Clinicians stress that most people are at low risk for severe disease, but certain groups face higher danger if infected. “Most of the time, we don’t get sick because the amount of spores we breathe in is minimal (assuming we are not working outside all day),” said Dr. Zaid Fadul. He warned that people with weakened immune systems or heavy exposure can have serious outcomes.
“If the immune system is compromised, histoplasmosis can run amok and cause a life-threatening illness,” Dr. Fadul said, underscoring why immunosuppressed patients need quick assessment. Antifungal medications are available for severe cases, and early treatment can prevent complications for those who develop significant symptoms. In Tennessee, some of the confirmed patients have required hospitalization and a portion are listed as critically ill.
Testing matters because antibiotics don’t work against fungal infections, so lack of improvement on standard treatments should prompt further evaluation. Clinicians can order antigen testing, cultures, or other diagnostics depending on the clinical picture and how sick a patient is. Public health officials advise anyone with new or persistent respiratory symptoms who believes they might have been exposed to seek medical care and mention the possibility of histoplasmosis.
Preventive steps focus on reducing exposure in known risk settings: avoid disturbing soil or droppings in areas where birds or bats congregate, wear protective gear when cleanup is necessary, and use wetting methods to minimize airborne dust. Employers and people who work in construction, landscaping, or cave exploration should be especially mindful of protective measures. Public awareness can cut down unintentional exposure and speed care for those who fall ill.
State investigators continue to collect data, interview patients, and look for links that might pinpoint contaminated sites or common activities. The presence of a cluster highlights how environmental fungi can create localized outbreaks even when most people remain unaffected. For now, health officials recommend vigilance, prompt testing for suspicious respiratory illnesses, and appropriate treatment for those confirmed to have histoplasmosis.
