“I need you to sample I have that Histoplasma thingy?” I calmly told the person on the phone I don’t
need to sample, if you have an accumulation of bird dropping in the soil then
yes you the Histoplasma capsulatum or
H. capsulatum fungus in your
soil. “So we have a problem with
histoplasmosis?” Well yes and no. If you are going to disturb the soil and make
the fungus spores airborne then yes you have an increased risk of
exposure. If the fungus is somewhere
that no employees work then, the risk is minimal.
H. capsulatum
grows in many soils in the United States and around the world. The disease histoplasmosis that arises from
exposure to H. capulatum is most
prevalent in the Ohio and Mississippi River valleys. People who are immunocompromised (e.g. AIDS,
Diabetes, etc.), the elderly, and the very young are at greatest risk. For
healthy adults, infected people only display mild flu-like symptoms that
resolve by themselves in a few days.
However, if exposure is an issue, then the first logical
step is to remove the birds or bats from the location. Once the source of nitrogen (droppings) is
eradicated the area can be cleaned and disinfected. Dust suppression controls (water) must be
employed while removing the contamination.
Furthermore, personal protective equipment (e.g., Tyvek coveralls and
NIOSH-approved respirators) should be used while cleaning up the area. Clean, impervious surfaces (e.g., wood,
metal, plastic, etc.) left behind thoroughly.
Some occupations with risk of exposure to H. capsulatum:
•
Bridge Inspectors
•
Painters
•
Chimney Sweeps
•
Demolition Workers
•
Farmers/gardeners
•
HVAC installer and service technicians
•
Pest Control Workers
•
Roofers
Ultimately, many fungi live all around us. You have nothing to worry about if you have
no medical condition suppressing your immuno-system or have specific allergies
to the species of fungus. However, if you are going to disturb the environment
then all bets are off, and the safest approach is to assume the soil has the
fungal spores and take the necessary precautions to protect the workers.
Reference
National Institute for Occupational Safety and Health
(NIOSH). 2004. Histoplasmosis. Fact
Sheet.