University of Cincinnati (UC) researchers say exposure to a certain group of fungal spores -abundant in the air that we breathe every day – can make young children more susceptible to developing multiple allergies later in life.
The team found that infants who were exposed to basidiospores and other airborne fungal spores- specifically penicillium/aspergillus and alternaria- early in life were more likely to develop allergies to mould, pollen, dust mites, pet dander and certain foods as they grew older. This is the first study to show a relationship between specific airborne fungal spores and an increased risk for multiple allergies in children, the UC team reports in an upcoming edition of Paediatric Allergy and Immunology. A fungus is a plantlike organism that grows by releasing tiny reproductive cells (spores) into the air. Mould is a type of fungus that can grow on any moist surface – including wood, drywall and cement.Previous allergy studies focused on visible mould or total mould concentrations, not the identification of specific airborne fungal spores. The UC-led study showed that exposure to specific airborne fungal spores may increase allergic reactions and others could help reduce them. These findings reinforce the idea that not all fungi are created equal, says Tiina Reponen, PhD, Professor of Environmental Health at UC and corresponding author on the study.”It turns out that the health effects of airborne fungal spores are more complicated than we thought,” she says. “It’s not enough to look just at total mould in our homes and offices. We need to understand how specific types of mould interact with each other in the environment to affect our respiratory health. Some fungi can have harmful effects on the body, but others may be beneficial.” “There are literally thousands of different types of mold in the air we breathe,” adds Melissa Osborne, a graduate of UC’s environmental and occupational hygiene program and study lead author. “But because mould exists naturally in the outdoors, it’s very difficult to completely remove mould spores from the air.”Using a small air sampling device, the UC research team collected fungal spores from the homes of 144 infants enrolled in the Cincinnati Childhood Allergy and Air Pollution Study (CCAAPS). The CCAAPS, funded by the National Institute of Environmental Health Sciences, is a five-year study examining the effects of environmental particulates on childhood respiratory health and allergy development. Air samples were collected for a total of 48 hours in the child’s primary activity room and in the child’s bedroom during sleep. Samples were analysed for both total and individual spore counts. “We found that, at least in children, some fungi may cause allergic sensitisation while other fungal types may actually inhibit the development of allergies,” explains Osborne. “But very little is known about how infant allergies to environmental allergens develop,” she adds, “and more research is needed before we will fully understand the impact of fungi as an allergen in infants.”(Source: Paediatric Allergy and Immunology: University of Cincinnati: June 2006).