Drying wet clothing on racks in poorly ventilated spaces could increase the amount of mould growing in your home, which is associated with poor health and, in some cases, even death, according to Rebecca Drummond, Associate Professor of Immunology and Immunotherapy at the University of Birmingham.
When mould grows in your home, it can form black or green coloured patches on the walls, and usually creates an unpleasant musty smell. It shouldn’t be ignored, because being exposed to mould over long periods of time can have serious health implications.
Professor Drummond said: “Mould is a broad term for a group of fungi that produce tiny particles called spores. Fungi produce spores when conditions are right for their growth, which can include cooler temperatures and high humidity. This is why you’re more likely to find mould growing on bathroom ceilings or damp walls, where there is more water for fungal spores to settle and grow.
“There are many different species of mould. The most common ones to cause problems in damp homes are penicillium and aspergillus. It’s estimated that we breathe in small numbers of spores from these fungi on a daily basis.
“Luckily, our immune system is very good at spotting and killing fungal spores, which limits the number of fungal lung infections in humans even though we’re constantly exposed. Immune cells called macrophages sit inside the air spaces of the lungs (called alveoli), and these cells eat anything you inhale that could be considered harmful, including fungal spores.”
But Professor Drummond told The Conversation there are many people whose immune systems are not able to remove fungal spores, and in these cases the fungi can cause dangerous infections or make underlying health conditions (such as asthma) much worse. People who have damaged or compromised immune systems are at higher risk of becoming seriously unwell from fungal infections. Moulds like aspergillus cause infections in patients with limited immune function, or who have lung damage from diseases like asthma, cystic fibrosis and chronic obstructive pulmonary disease (COPD) associated with heavy smoking.
Professor Drummond said: “In people with asthma, the immune system overreacts to triggers (including fungal spores) causing inflammation in the lung. This inflammation makes it more difficult to breathe by reducing the size of the airways. The same type of immune response is responsible for the symptoms of asthma and allergic responses, and fungal spores can also trigger these same types of immune responses. This means that fungal spores can be a particularly powerful trigger for some people.
“In very extreme cases, the fungal spores don’t just cause inflammation but can invade the airways and block them leading to bleeding within the lung. This happens when spores germinate and form long spiderweb-like projections called mycelium which create sticky lumps that block airways and damage the delicate tissues of the lung.”
She added: ” In 2020, toddler Awaab Ishak died as a direct result of high exposure to fungal spores, caused by excessive damp and mould in his home.His death led to a change in UK law (Awaab’s Law) which requires landlords to respond promptly to damp in homes they manage, to ensure that tenants are not exposed to excessive levels of fungal spores which can affect their physical and mental health.
“It’s important, then, to help keep your home free of mould. The best way to do this is ensure you have good ventilation and take other measures to reduce damp, such as using a dehumidifier or investing in a heated clothes rack to dry your clothes indoors in the winter.”
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