Can a cave visit cause a histoplasmosis infection?
Histoplasmosis is a fungal infection that people usually catch by breathing in spores from soil contaminated with bat droppings. A visit to a cave can definitely lead to this infection if the cave has bats and their waste. Medical reports have documented specific outbreaks where groups of people got sick after exploring caves.
What the research says
A 1976 study found that sixteen people developed acute histoplasmosis after visiting a single cave. The researchers confirmed the diagnosis in thirteen of them using chest X-rays and skin tests. They noted that the disease is linked to the ecology of bats living in such environments 5.
More recent evidence supports this link. A 2023 review explains that Histoplasma species infect humans and animals, notably bats. These fungi live in the soil mixed with bat guano, which is common in caves 4. This connection between bats, their waste, and the fungus is the primary reason caves pose a risk.
Real-world clusters have occurred. In one report, twelve members of an extended family from Costa Rica were suspected of having histoplasmosis after all of them visited the Venado Caves. Another report from 2011 notes that while tourist cave visits are low risk, sport cavers face higher risks for obscure infections like histoplasmosis transmitted by underground fauna 36.
What to ask your doctor
- What specific precautions should I take before visiting a cave known to have bats?
- Are there any vaccinations or medications recommended to prevent fungal infections before caving?
- What symptoms of histoplasmosis should I watch for after returning from a cave trip?
- How long after exposure to a cave environment should I wait before seeking medical help if I feel sick?
This question is drawn from common patient questions about Infectious Disease and answered using cited medical research. We do not provide individualized advice.