Histoplasmosis

2 Active Outbreaks

Histoplasmosis is a fungal infection caused by Histoplasma capsulatum. It primarily affects the lungs but can disseminate to other parts of the body, especially in individuals with weakened immune systems. This disease is most common in regions with soil contaminated by bird or bat droppings, notably the Ohio and Mississippi River valleys in the US.

2
Countries Affected
2
Recent Cases (30d)
2
Active Outbreaks
141d ago
Last Updated
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What is Histoplasmosis?

Histoplasmosis was first described by Samuel Darling in Panama in 1905, who initially believed the causative agent was a protozoan. It was later correctly identified as a dimorphic fungus, *Histoplasma capsulatum*, in the 1930s. By the mid-20th century, it was recognized as a widespread endemic disease in parts of the Americas and beyond.

Symptoms

  • Asymptomatic or Mild: Many people experience no symptoms or mild, flu-like illness (fever, chills, headache, muscle aches, cough, fatigue).
  • Acute Pulmonary: Fever, chills, headache, muscle aches, cough, chest pain, fatigue. Symptoms usually appear 3-17 days after exposure.
  • Chronic Pulmonary: Can mimic tuberculosis, causing persistent cough, shortness of breath, chest pain, fever, night sweats, and weight loss.
  • Disseminated (Severe): Affects immunocompromised individuals, causing weight loss, skin lesions, ulcers, enlargement of the liver and spleen, adrenal insufficiency, and potentially meningitis.

Transmission

Histoplasmosis is acquired by inhaling microscopic spores of the fungus *Histoplasma capsulatum*. These spores become airborne when soil contaminated with bat or bird droppings is disturbed. The disease is not transmitted from person-to-person, from animals to humans, or through direct contact with contaminated soil.", } ```

Contagious Period: Varies by disease

Prevention

  • Avoid disturbing soil heavily contaminated with bird or bat droppings, especially in endemic areas (e.g., old barns, chicken coops, caves).
  • Wear an N95 respirator mask, gloves, and protective clothing when working in high-risk environments or disturbing contaminated soil.
  • Dampen soil or dusty areas with water before beginning work to minimize airborne dust and spores.
  • There is currently no vaccine available for Histoplasmosis.

Active Outbreaks & Recent Cases

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🚨 Tennessee Fungal Outbreak Linked to Soil Exposure Leaves 35 Ill, 1 Dead; What is histoplasmosis?

United States, Alaska 2026-01-28
Active

A fungal outbreak linked to soil exposure in Tennessee has caused 35 illnesses and one death. Public health authorities are investigating the spread of histoplasmosis and educating the public about this disease. Immediate public attention is crucial to address the ongoing outbreak and prevent further cases.

Nashville boy living with rare complication from histoplasmosis, fungal infection rising in Middle Tennessee

World, World 2025-12-11
Active

NASHVILLE, Tenn. (WSMV) - The Tennessee Department of Health is warning about a rise in cases involving a fungus. They now say they've seen 20 cases of histoplasmosis, a fungal infection caused by breathing in spores typically found in soil containing bird or bat droppings. Previous Coverage: Mids... Source: WSMV Nashville - Read Full Article

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Expert Resources & References

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CDC

Official guidance from the U.S. Centers for Disease Control and Prevention

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WHO

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Research

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Medically Reviewed Content

Disease information on Virus Watcher is reviewed by our Chief Epidemiologist, a former CDC lead analyst for FluSight forecasting. Outbreak data is aggregated from verified sources including BEACON, ProMED, WHO, CDC, and 50+ national health agencies. This information is for educational purposes and should not replace professional medical advice.

Last reviewed: 2026-06-19

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