Mold and You
Mold is a family of organisms that are found throughout nature. Unlike plants, mold needs food and water sources in order to thrive. This food source is often in the form of a carbohydrate material, such as wood or cellulose.
Mold grows in units called mycelium and reproduce through the formation of spores. Spores frequently become airborne, and like pollen can cause allergic disease.
What Types of Diseases Can Mold Cause?
Mold has well-known associations with human disease. People can develop fungal infections of various types, especially those with poorly functioning immune systems. Fungi are also known to produce toxins, which have been blamed for causing various diseases.
Molds can also cause severe immune reactions as a result of colonizing (living in, but not causing an actual infection) the lungs (hypersensitivity pneumonitis) and the sinuses. Molds are also well known to cause various allergic diseases, such as allergic rhinitis and allergic asthma.
Which Molds are Known to Cause Allergies?
There are thousands of types of mold, however, only a few of these are currently available for allergy testing. The following are the most likely causes of allergic disease based on the types of mold spores collected in the air:
- Alternaria is a common outdoor mold; allergy to this mold can be associated with severe asthma.
- Cladosporium is the most common airborne outdoor mold.
- Aspergillus is a common indoor and outdoor mold; also associated with allergic
- Penicillium is a common indoor mold; allergy to which is not associated with antibiotic allergy.
- Helminthosporum is more commonly found in warmer climates.
- Epicoccum is found in grassland and agricultural areas.
- Fusarium is a commonly found on rotting plants.
- Aureobasidium is a common outdoor mold, commonly found on paper, lumber and painted surfaces.
- Phoma is an outdoor mold, especially common during wet periods.
- Smuts are abundantly found in areas of agriculture.
- Rhizopus and Mucor are commonly found on decaying leaves and damp indoor areas. Airborne forms of these molds are less common.
- Yeasts are commonly found in the air during wet periods in agricultural areas. Allergic disease to Candida albicans is controversial, despite some people having positive allergy testing to this type of mold.
What Times of the Year Does Mold Allergy Occur?
In colder climates, molds can be found in the outdoor air starting in the late winter and peaking in the late summer to early fall months (July to October). In warmer climates, mold spores may be found throughout the year, with the highest levels found in the late summer to early fall months.
While indoor molds can occur year-round and are dependent on moisture levels in the home, indoor mold levels are higher when outdoor mold levels are higher. Therefore, a common source of indoor mold is from the outside environment, although can also be from indoor mold contamination.
What Measures Can Be Used to Decrease Indoor Mold Levels?
- Prevent outdoor molds from entering the home by keeping doors and windows closed and using air conditioning equipped with allergen-grade air filters
- Control indoor moisture with the use of dehumidifiers
- Fix water leaks in bathrooms, kitchens, and basements
- Ensure adequate ventilation of moist areas
- Clean (or replace) contaminated surfaces with diluted a chlorine bleach solution (one part household bleach in 9 parts water), while using proper protective gear (mask and goggles)
- Utilize HEPA-filters on vacuums or as a stand-alone air filter
- Limit indoor houseplants, and ensure those that are present are free of mold on leaves and in potting soil
For more information: https://www.verywellhealth.com/mold-allergy-83231