REVIEW
Adverse Health Effects of Indoor Molds
LUKE CURTIS MS, CIH,
1 ALLAN LIEBERMAN MD, 2 MARTHA STARK MD, 3 WILLIAM REA MD 4 AND MARSHA VETTER MD, P H D 5

1School of Public Health, University of Illinois at Chicago, Illinois, 2Center for Occupational and Environmental Health, North Charleston, South Carolina,
3 Harvard University, Newton Center, Massachusetts, 4Environmental Health Center, Dallas, Texas, 5Environmental Health Center, Hoffman Estates, Illinois, USA
 

Abstract
Purpose: It has long been known that eating moldy food is hazardous, and airborne Aspergillus and other fungi can cause life-threatening illnesses in immuno-compromised patients. However, the possible health risks of indoor mold exposure in immunocompetent humans are controversial. This literature review examines the health effects of indoor airborne exposure to mold.

Design: Literature review.

Materials and Methods: This review was conducted by searching PubMed and other medical databases, as well as reading recent conference reports.
Results: Many studies link exposure to damp or moldy indoor conditions to increased incidence and/or severity of respiratory problems such as asthma, wheezing and rhinosinusitis. Stachybotrys produces trichothecenes and other mycotoxins, which can inhibit protein synthesis and induce hemorrhaging disorders. Indoor mold exposure can alter immunological factors and produce allergic reactions. Several studies have indicated that indoor mold exposure can alter brain blood flow, autonomic nerve function, brain waves and worsen concentration, attention, balance and memory. Failure to perform the appropriate objective evaluations on patients may account for the commonly held belief that indoor mold exposure poses no significant health risks to immunocompetent humans.


Conclusions: Exposure to high levels of indoor mold can cause injury to and dysfunction of multiple organs and systems, including respiratory, hematological, immunological, and neurological systems, in immunocompetent humans.

Keywords: mold, fungi, mycotoxin, allergy, indoor air quality, asthma, neurotoxicity, lung hemorrhage, Aspergillus, Penicillium, Cladosporium, Alternaria, Stachybotrys.
 

INTRODUCTION
In recent years, public attention has become increasingly focused on human health concerns linked with mold (fungi) inside homes and workplaces. Indoor airborne mold exposure has been associated with adverse human health effects in multiple organs and body systems, including respiratory, nervous, immune, hematological and dermatological systems. Indoor mold exposure can also lead to life-threatening systemic infections in immunocompromised patients. A qualitative systematic literature review was undertaken in order to examine and JNE (gamma) JNE51751.3d 23/11/04 18:04:51 Rev 7.51n/W (Jan 20 2003) The Charlesworth Group, Wakefield +44(0)1924 369598 101014 Journal of Nutritional & Environmental Medicine (September 2004) 14(3), 1—14 ISSN 1359-0847 print/ISSN 1364-6907 online/02/010071-02
# 2004 Taylor & Francis Ltd DOI: 10.1080/13590840400010318 appraise the current state of knowledge about indoor mold-linked health effects, and to summarize the available evidence for the use by health professionals. Physicians, in particular, may encounter patients with common symptoms occurring in particular environments, and understanding the potential for mold-related health effects is key to the complete investigation of those environments. Physicians and industrial hygienists may be asked to contribute reports to assist the courts in settling suits. In 2002, an estimated 10,000 mold-related cases were pending in US courts [1]. Also in 2002, the insurance industry paid out $2 billion in mold-related claims in Texas alone [2]. Literature was reviewed using the peer-reviewed database, and from recent conferences on indoor molds. The levels of evidence available for each topic varied from level I (from at least one properly randomized controlled trial) through level II (from trials without randomization, exceptionally convincing uncontrolled experiments, cohort or case—control studies), to level III (opinion of respected authorities based on clinical experience, descriptive studies, or reports of expert committees) [3]. [Return to MH]


MOLDS IN THE INDOOR ENVIRONMENT
Fungi (or molds) are ubiquitous in both indoor and outdoor environments and are frequently dispersed by airborne spores. Mold and mold spores require moisture and a
food source, such as cellulose or decaying food, to grow [4]. As mold spores swell with water and grow, they elongate, forming balloon-like protuberances (hyphae), which secrete digestive enzymes and mycotoxins. The fungi then digest the food source to support their growth. About 100,000 fungal species have already been identified; in fact, fungi are estimated to comprise an astounding 25% of the world's biomass [5]. Various surveys of homes in North America and Europe have reported that visible mold and/or water damage are common, found in 23—98% of all homes examined [6—9]. There are no official standards at this time for indoor airborne fungi concentrations. However, indoor fungal levels above a range of 150—1000 colony-forming units per cubic meter of air (cfu m 2 3 ) are considered to be
sufficient to cause human health problems [7, 10—12]. Numerous reports have documented that indoor air can be contaminated with fungal spore levels well in excess of 1000 cfu m 2 3 [13—20]. The most common indoor fungal genera collected are Cladosporium, Aspergillus and Penicillium [13—20]. Alternaria, Stachybotrys, Rhizopus, Mucor, Wallemia, Trichoderma, Chaetomium, yeasts, Botrytis, Epicoccum and Fusarium species are often found indoors as well [13—20]. [Return to MH]


MOLD-RELATED HEALTH SYMPTOMS
Patients have been reporting multiple ill health effects linked to exposures to mold. Studies of more than 1600 patients suffering ill effects associated with fungal exposure were presented at one meeting in Dallas in 2003 (21st Annual Symposium of Man and His Environment, Dallas, Texas, 19—22 June 2003) [21—25].
To cite a few studies: Lieberman [21] examined 48 heavily mold-exposed patients who had the following health problems: muscle and/or joint pain (71%), fatigue/weakness (70%), neurocognitive dysfunction (67%), sinusitis (65%), headache (65%), gastrointestinal problems (58%), shortness of breath (54%), anxiety/depression/irritability (54%), vision problems (42%), chest tightness (42%), insomnia (40%), dizziness (38%), numbness/tingling (35%), laryngitis (35%), nausea (33%), skin rashes (27%), tremors (25%) and heart palpitations (21%). Rea et al.'s study [23] of 150 heavily indoor mold-exposed patients found the following health problems: fatigue (100%), rhinitis (65%), memory loss and other neuropsychiatric problems (46%), respiratory problems (40%), fibromyalgia (29%), irritable
2 bowel syndrome (25%), vasculitis (4.7%) and angioedema (4.0%). These clinical reports suggest that there can be multisystem adverse effects of airborne mold. All reported cases had environmental mold exposure consistent with toxic mold exposure. [Return to MH]


MECHANISMS OF MOLD-RELATED HEALTH EFFECTS

Fungi can exert ill health effects by three major mechanisms: allergy, toxicity, and infection.

Allergy and Irritation

At least 70 allergens have been well characterized from spores, vegetative parts and small particles from fungi (0.3 mm and smaller) [26, 27]. A review of 17 studies revealed that 6—10% of the general population and 15—50% of atopics had immediate skin sensitivity to fungi [28]. Fungi produce beta glucans, which have irritant properties [29].

Toxicity

Fungi produce a wide variety of toxic chemicals called mycotoxins [4, 30, 31]. Some common mycotoxins include: aflatoxins—very potent carcinogens and hepatotoxins, produced by some Aspergillus species; ochratoxins—nephrotoxic and carcinogenic, produced by some Aspergillus and Penicillium; sterigmatocystin—immunosuppressive and a liver carcinogen, produced by Aspergillus species, especially A. versicolor; trichothecenes—produced primarily by Stachybotrys and Fusarium species and have been reported to inhibit protein synthesis and cause hemorrhage and vomiting. Fungi also produce beta glucans, which have immunological effects [32]. The smell of molds comes primarily from volatile organic compounds [33]. Adverse human and animal effects from mycotoxin-contaminated foodstuffs have been well recognized since the early twentieth century [30, 34], but the pathway of mycotoxin injury through inhalation is questioned [35]. Because it is unethical to conduct controlled studies on humans with inhaled mycotoxin exposure, only controlled animal exposures and human cohort and case—control studies can be carried out. The literature reveals that significant amounts of mycotoxins (including ochratoxin, sterigmatocystin and trichothecenes) are present in indoor dust [36—39] and dust or fungal particles less than 10 mm in diameter are respirable, thus allowing absorption of mycotoxins through the lungs [31, 34, 40, 41]. [Return to MH]

Patients exposed to indoor Stachybotrys have been found to have measurable blood levels of the Stachybotrys hemorrhagic toxin stachylysin [42]. Levels of trichothecene mycotoxins in urine have also been found in significantly higher levels in patients exposed to high indoor fungal levels as opposed to an unexposed control group [43]. Blood ochratoxin levels have been found to be significantly higher in food industry workers exposed to airborne ochratoxin vs. unexposed controls [39]. These findings support an inhalation pathway for entry of mycotoxins into the body. [Return to MH]

Infection

Fungi such as Candida, Histoplasmosis, Cryptococcus, Blastomyces and Coccidioides can infect immunocompetent people [44]. Fungi such as Trichophyton, Candida and Malasezia commonly cause minor skin infections in  immunocompetent humans [45]. Serious infections by such fungi as Candida, Aspergillus and Pneumocystis mostly involve severely immunocompromised patients [45—47]. In recent years, the incidence of life-threatening infections in immunocompromised patients from Aspergillus and other common serious infections by such fungi as Candida, Aspergillus and Pneumocystis mostly involve severely immunocompromised patients [45—47]. In recent years, the incidence of life-threatening infections in immunocompromised patients from Aspergillus and other common3 fungi has been growing rapidly [48, 49]. Invasive aspergillosis is very common among immunocompromised patients, with the following reported incidence rates: lung transplants: 17—26%; allogenic bone marrow transplants: 5—15%; acute leukemia: 5—24%; heart transplants: 2—13% [50—51]. Even with strong anti-fungal drugs and intense hospital
treatment, mortality rates from invasive aspergillosis range from 50 to 99% in the immunocompromised [52, 53]. [Return to MH]

SAMPLING FOR MOLD EXPOSURE
Indoor fungal sampling is most commonly performed by measuring airborne levels of viable (culturable) or total (viable and non-viable) spores [54, 55]. Some of the airborne viable sampling methods, such as Andersen samplers, collect air for only a few minutes. Settle plates are an inexpensive method to obtain a semi-quantitative measure of indoor airborne fungi levels. Viable and non-viable airborne spore counts can vary considerably over a period of minutes, so air sampling over several periods of time may be necessary to accurately characterize airborne fungal spore levels [54, 55]. However, airborne fungi measurements fail to take into consideration mold contamination in dust or surfaces (often visible to the naked eye) and mycotoxins in air, dust and on surfaces [54, 56]. Therefore,
testing settled dust for fungi and mycotoxins has been recommended [54, 55]. Other techniques, such as polymerase chain reaction (PCR), enzyme-linked immunosorbent assay (ELISA), and measurement of fungal volatile organic compounds, polysaccharides, ergosterol and beta glucans, have also been found to be useful in assaying indoor environments for molds, their allergens and mycotoxins [54]. [Return to MH]


INDOOR MOLD EXPOSURE AND HEALTH EFFECTS IN BODY SYSTEMS


Respiratory System
Many epidemiological studies have noted that residential exposure to molds and/or chronic dampness can increase asthma/wheezing incidence or morbidity in both children and adults [7—9, 57—70]. Asthma and related conditions are very common in the USA, with an overall prevalence of about 5.4% among all age groups and incidences as high as 27% in inner city children [71]. Studies with infants have reported that higher fungal exposures are associated with more wheezing, coughing and respiratory illness [72, 73]. Higher indoor beta glucan levels have been associated with significantly higher levels of chest tightness and joint pain
[74]. Non-industrial occupational mold exposure has been reported to be associated with significantly higher levels of asthma, sinusitis, irritated skin and eyes, and chronic fatigue [75—79]. One study found that patients exposed to high indoor fungal levels had significantly lower lung function than unexposed controls [24]. Higher outdoor fungal concentrations have been linked to higher asthma death rates [80] and higher asthma incidence [81—83] in children or young adults. Challenge exposures with Penicillium and Alternaria extracts equivalent to high outdoor levels of fungi were noted to severely lower lung function in asthmatics [84]. Skin sensitivity to Alternaria has been linked to much higher risk (odds ratio 190, 95% confidence interval 6.5—6.536, pv0.0001) of respiratory arrest [85]. Various epidemiological studies have associated skin sensitivity to common indoor fungi and higher asthma incidence or severity [86—90] and higher rates of sinusitis
[91]. Airborne fungal exposure is known to cause bronchopulmonary aspergillosis and hypersensitivity pneumonitis, and can cause sinusitis [92, 93]. An estimated 14% of the US population suffers from rhinosinusitis and related conditions [94]. Allergic fungal sinusitis was diagnosed on the basis of fungal growth in nasal secretions and the presence of allergic mucin in 93% of 101 consecutive patients undergoing sinus surgery [94]. Another study was able to recover and culture fungi from the sinuses of 56% of 45 patients undergoing endoscopic sinus surgery for chronic rhinosinusitis [95]. A long-term cohort study of 639 patients with allergic fungal sinusitis demonstrated that remedial steps taken to reduce fungal exposure (by utilizing, for example, air filters, ionizers, moisture control and anti-microbial nasal sprays) significantly reduced rhinosinusitis and improved nasal mucosa morphology [22]. This study concluded that failure to reduce airborne fungi levels to less than four per hour on a settle plate failed to resolve the sinusitis [22]. Although, historically, anti-fungal drugs have generally not been recommended for the treatment of fungal sinusitis [92, 93], recent observational studies have found beneficial effects of oral and nasal medication for sinusitis patients [22, 96]. Several studies have linked residential exposure to various fungi with hypersensitivity pneumonitis [97—99].[Return to MH]

Hematological Effects
Exposure to high indoor levels of Stachybotrys, Aspergillus and other fungi has been epidemiologically associated with infant lung hemorrhage [100—104]. Although questions were raised after this association was discovered [105], it meets many epidemiological criteria for causality [106]. Acute infant pulmonary hemorrhage can be rapidly fatal; when the infant survives, lung blood vessel damage is present and deposits of hemosiderin will remain in the lung macrophages and can be seen in tissue obtained during bronchoscopy [101]. Stachybotrys fungi produce a wide range of trichothecene mycotoxins (including satratoxins and T2), several roridin epimers, verrucarin J and B and hemolysin [31, 103]. A hemorrhagic protein called stachylysin has been isolated from Stachybotrys collected from
homes of infants with lung hemorrhage [107, 108] and from serum of patients with residential Stachybotrys exposure [42]. It is hypothesized that infants with their rapidly growing lungs are more susceptible to the toxic effects of Stachybotrys mycotoxins [109]. Studies with Stachybotrys-exposed adults have noted a significantly higher incidence of health conditions such as wheezing, skin and eye irritation, 'flu-like symptoms and chronic fatigue [110]. Stachybotrys has been isolated from the lungs of a child with pulmonary hemosiderosis [111]. A case study was presented of 16-month-old twins in a mold-infested home, one of whom died of pulmonary hemosiderosis [112]. High levels of trichothecene mycotoxins were found in the lungs and liver of the dead infant, while high IgG levels to Stachybotrys and IgM
levels to satratoxin and trichothecenes were found in the serum of the surviving infant. Environmental sampling in the twins' home found high levels of satratoxin as well as high levels of spores from Stachybotrys, Aspergillus versicolor and Penicillium [112]. [Return to MH]

Immune System
Some studies have reported that indoor fungi-exposed patients have higher serum levels of IgG, IgA and IgM antibodies to common fungi, trichothecenes and satratoxins [113—115]. IgG antibodies to nine common indoor fungi were significantly higher in subjects with sinusitis vs. non-sinusitis subjects in a moldy school [116]. Other studies have noted no significant increases in fungal IgG [117, 118] or fungal IgE [113] in fungi-exposed patients. Indoor fungal exposure has been associated with altered levels of T4, T8 and natural killer cells and higher levels of autoantibodies [23, 25, 119, 120]. Occupants of homes with high Indoor glucan exposure had a lower proportion of cytotoxic t-cells (CD8zSF61z) and higher secretion of tumor necrosis factor than occupants of homes with lower levels of beta glucans [121]. Studies of animals given such common mycotoxins as aflatoxins, ochratoxins and trichothecenes orally showed considerable immune impairment, including depression
of T cells, B cells and macrophages [122]. Human cell line studies have also found that many mycotoxins can suppress T-cell, B-cell and natural killer cell activity at serum concentrations similar to those found in indoor mold-exposed patients [123]. Central Nervous System Two case series of 48 and 150 mold-exposed patients found significant fatigue and weakness in 70—100% of cases, and neurocognitive dysfunction including memory loss, irritability, anxiety and depression in over 40% of the patients [21, 23]. Numbness, tingling and tremor were also found in a significant number of patients [21, 23]. These signs and symptoms have been described as classic manifestations of neurotoxicity [124]. A study of 43 mold-exposed patients found that they performed significantly worse than 202 controls on many neuropsychiatric tests, including balance sway speed, blinking reflex, color perception, reaction times and left grip strength (pv0.0001) [125]. Quantitative
electroencephalogram (qEEG) studies in 182 patients with documented mold exposure also noted significant alterations in brain waves, including hypoactivation of the frontal cortex and narrowed frequency bands [126]. Higher levels of mold exposure (longer time in mold-infested area, presence of Stachybotrys or higher cfu m
air) were associated with significantly more abnormal qEEGs as well as significantly worse scores of concentration and motor and verbal skills in these 182 patients [126]. A triple-headed SPECT brain scan revealed neurotoxic patterns in 26 of 30 (87%) mold-exposed patients [127]. An iriscorder study of autonomic nervous function in 60 mold-exposed patients found that 95% had abnormal autonomic responses of the pupil compared with the population reference range
[23]. Visual contrast sensitivity studies were often abnormal in indoor mold-exposed patients [23]. Additional studies have reported that mold-exposed patients do significantly worse on tests of attention, balance, reaction time, verbal recall, concentration, memory, and finger tapping compared with the general population reference range [24, 128, 129]. [Return to MH]

Most of these patients also experienced many health problems, including chronic fatigue, headaches, insomnia and decreased balance, concentration and attention. Studies of indoor mold-exposed children and adults found significantly more neurophysiological abnormalities vs. controls, including abnormal EEGs and abnormal brainstem, visual and somatosensory evoked potentials [25, 130, 131]. Lieberman [21] presented a case series of 12 patients who developed tremors following
documented heavy indoor mold exposure. Numerous articles have reported domestic dogs developing tremors following ingestion of moldy food [132—134]. Territrem b, a mycotoxin produced by the common fungus Aspergillus terreus, has been shown to be an irreversible binder and inhibitor of acetylcholinesterase [135].

Renal System
It is known that ochratoxin-contaminated food is nephrotoxic [136, 137]. Indoor airborne exposure to ochratoxin may also be nephrotoxic. In a case report of a family presenting with increasing thirst/urination, lethargy, and skin rash, a considerable amount of ochratoxin was found in their house dust. The family recovered after moving to another home [36]. [Return to MH]

Reproductive System
The literature suggests a relationship between heavy airborne fungal exposure and reproductive dysfunction. Kristensen et al. [138, 139] reported that airborne mycotoxin exposures in Norwegian grain farmers was significantly related to higher rates of pre-term deliveries, late-term miscarriages and higher rates of endometrial and ovarian endocarcinoma. The veterinary literature finds a strong association between mycotoxtins in feedstuffs and reproductive problems [140].

Diabetes
There is a great deal of evidence that links environmental factors to the triggering of type 1 diabetes. Exposure to viruses, bacteria and mycotoxins such as alloxan, streptozatocin and L-asparginase has been linked to the development of type 1 diabetes in animals and humans [141—143]. Lieberman [21] reported that in a single year, five of his patients developed type 1 diabetes following documented heavy indoor mold exposure.

DIAGNOSIS AND MANAGEMENT OF POTENTIALLY MOLD-RELATED HEALTH PROBLEMS

A careful medical and environmental history is an essential first step in evaluating a patient for mold-related health problems [144—147]. Particular attention should be paid to any history of exposure to visible mold and/or water damage at the home or workplace. Environmental sampling for viable spores, total spores, and mycotoxins in the air and dust can provide important exposure information. For a helpful overview of sampling methods, see references [54, 148, 149]. For an informative guide to the classification, identification and biology of common indoor fungi, see reference [4]. Several good guides exist for the prevention and remediation of indoor fungi problems [144, 148—151]. For patients suspected of having substantial fungal exposure, a battery of sophisticated laboratory tests has been developed: a basic metabolic panel to test for several important parameters (including electrolytes, blood sugar, liver and kidney status); measurement of antibodies to molds and mycotoxins in serum [113, 114]; immune tests for autoantibodies, complement, gamma globulins and lymphocyte panels [120]; urine and blood testing for
mycotoxins [43]; visual contrast sensitivity tests; and pupillometry and heart rate variation to assist in the evaluation of autonomic nervous system function. The use of standard neuropsychological test batteries [23, 128—130], EEG and brain imaging techniques such as SPECT and magnetic resonance imaging (MRI) can be very helpful tools in documenting neurological damage [25,125, 127, 131, 145].

Pulmonary function tests are also useful for patients with respiratory symptoms [24, 124]. Failure to perform objective evaluations to access system or organ dysfunction account for the presently accepted position that airborne mold exposures have no significant adverse effects [35]. If end-stage organ damage
is suspected, consultation with a specialist may be useful. Other common indoor environmental exposures should also be considered as a potential
source of health problems. Common non-fungal indoor environmental factors include poor ventilation, carbon monoxide from faulty heat sources, leaking natural gas, pesticides, wood smoke, second-hand tobacco smoke, petrochemicals, such as cleaners/building materials/solvents, formaldehyde from outgassing carpets, building materials, bacteria, and allergens from the fur, feathers, saliva and excrement of common household animals such as cockroaches, dust mites, cats, dogs, mice, rats, caged birds, and pigeons. Exposure to ozone, second-hand tobacco smoke, cockroach allergens, formaldehyde, and viral infections have been noted to have a synergistic effect with fungal exposure to worsen asthma and rhinitis [152—156]. The most important part of treatment for mold-exposed patients, symptomatic or not, is avoidance of fungal exposure and remediation of mold contamination in the home and workplace. Any water leaks and damage from flooded or damp areas should be rectified immediately. Non-porous surfaces such as floors and walls that have visible mold growth should be cleaned. Porous waterlogged materials like carpet and furniture should be discarded. Control of humidity is important to control mold growth. The use of air conditioners and dehumidifiers can significantly reduce summertime indoor airborne mold concentrations [13, 157]. HEPA air filters can also significantly reduce indoor airborne fungi concentrations [158]. For cleaning severe indoor water or mold problems, the use of protective equipment like face masks and/or the use of a professional remediation firm may be essential [148—151]. [Return to MH]

Environmental control plays a key role in preventing Aspergillus infections. Several studies have linked hospital construction work to increased rates of invasive aspergillosis [159—162]. Environmental controls such as using HEPA filters, sealing rooms, regular cleaning of rooms, and using anti-fungal copper-8-quionolate paint have been shown to both significantly reduce airborne levels of Aspergillus and significantly reduce rates of invasive aspergillosis in immunocompromised hospital patients [158, 160—165]. Other recent research has indicated that a large number of Aspergillus spores can spread through water supplies [166] and that cleaning shower facilities can significantly lower airborne levels of Aspergillus [167]. [Return to MH]

Use of sublingual or fungal immunotherapy by injection has been shown to be beneficial to some patients sensitized to common indoor molds such as Alternaria and Cladosporium herbarium [168, 169]. Some studies with laboratory animals suggest that a high-quality diet with adequate antioxidant vitamins, selenium, phytochemicals, methionine and total protein can reduce the harmful effects of food mycotoxins [170, 171].


SUMMARY
There is an accumulated weight of evidence linking indoor airborne mold and/or mycotoxin exposures to multisystem adverse human health effects. A history of new
neurocognitive symptoms occurring in patients soon after heavy mold exposure, accompanied by objective neuropsychological findings in such patients, adds considerably to the weight of evidence from animal studies, epidemiological research, and case series. Health care professionals, building managers, homeowners and the general public need to be much more aware of the potential adverse health effects of high indoor fungal exposures and the need for proper building construction, maintenance, and remediation of dampness to prevent such effects. Potentially mold-related illnesses need to be considered in differential diagnoses, and careful exposure histories taken. Prompt removal from exposure to fungal contamination remains the treatment of choice, with some evidence that immunotherapy and nutritional support are also useful. Indoor airborne mold particles can be irritative to the respiratory tract, and fungal spores, antigens, volatile organic
compounds, and mycotoxins can be absorbed through the respiratory route to provoke injury by the mechanisms of allergy, toxicity, and infection.

 

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