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Black Mold
 
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Black Mold, also known as Stachybotrys Chartarum is a toxic greenish black fungus found worldwide that colonizes particularly well in high-cellulose material, such as straw, hay, wet leaves, dry wall, carpet, wall paper, fiber-board, ceiling tiles, thermal insulation, etc. The fungus (black mold), before drying, is wet and slightly slimy to touch.

Stachybotrys chartarum

A colony of Stachybotrys chartarum Stachybotrys chartarum is cosmopolitan and grows naturally on straw and other cellulose containing materials in soil. In the indoor environment, this mold is commonly found together with Stachybotrys chlorohalonata on cellulose containing materials including paper, canvas and jute which are wetted to a water activity > 0.98. In a study conducted in Denmark, Stachybotrys chartarum was found to produce a number of mycotoxins inclduding macrocyclic trichothecenes, satratoxins and roridins when growing on building materials. However, only 35% of the isolates from buildings produced the extremely cytotoxic mycotoxins, the satratoxins. This led to the conclusion that idiopathic pulmonary hemosiderosis in infants is possibly not caused by satratoxins but by other S. chartarum mycotoxins.The optimum temperature for growth for Stachybotrys chartarum is 23 oC with a minimum and maximum temperature of 2 and 37 oC respectively.

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There are about 15 species of Stachybotrys, world-wide. The toxic mold grows in areas where the relative humidity is above 55% which can include the home environment, not just the southeastern United States. This type of fungus does not grow on plastic, vinyl, concrete products, or ceramic tiles. It is not found in the green mold on bread or the black mold on the shower tiles. The toxic mold environmental risk may be one of the next major real estate “due diligence” concerns, especially in property development areas where major flooding has occurred.

The major concern is that one might not be able to permanently eliminate the entire toxic mold from the structure. There also remains a great propensity for future reoccurrence. The health risk/hazard could be back again. Therefore, we must recommend that great care be exercised to remove and dispose of all products, which have been contaminated by the toxic mold contaminated. This recommendation is supported by the Department of Health Administrations in many states. The third concern is that States’ Health Departments will consider ambiguous and genetic disposition as a response to the publics’ inquiries. There will be some people, especially children, that will exhibit more adverse reactions, including death, lung tissue damage, and memory loss, than other persons exposed to the toxic mold. This may depend on the chemical sensitivity, genetic disposition, predisposing health history (such as allergies, asthma, smoking, etc.). For some, the exposure to the toxic mold spores may just be a "health risk" and to others, it may be a real "health hazard" (potential life-threatening and loss of "quality of life"). Whether a potential liability concern is a risk or hazard will be paramount in defining the critical level of due diligence and disclosure response by responsible parties. There are already several major lawsuits concerning toxic mold exposure in residential and commercial buildings throughout the United States.

The problem is that this not only includes known residential and commercial flood areas incidents, but also numerous minor water releases due to plumbing failures, conductive condensation, house water leaks and accidents. The toxic mold concern could also be a problem where fires occurred at residential properties.

Currently, most health organizations consider exposure to Stachybotrys mold as a health hazard. Also, keep in mind that most responses leading to testing, investigations, and abatement of the Stachybotrys toxic mold are due directly to occupant complaints or documented detrimental health effects. Stachybotrys mold may evolve to a point where it is regarded with the same cautions, response and liability concerns as those attributed to lead-base paint and asbestos. Health hazards and risks associated with concern to exposure to Stachybotrys are currently considered as short-term effects. Exposure to radon gas in houses is considered a long-term health risk and is not considered a short-term hazard.

Stachybotrys produces a mycotoxin that causes animal and human mycotoxicosis. This type of mold is thought to be a possible cause of the “sick building syndrome”. In May 1997, the Journal of the American Medical Association carried a news article titled “Floods carry potential for toxic mold disease”. Children’s exposure to air-borne Stachybotrys spores is thought most likely to cause pulmonary hemosiderosis (bleeding in the lungs). Please be aware that there is no threshold dangerous spore exposure level by the U.S. EPA or any other health administrations. There are ongoing new epidemiology studies being conducted. There is reference information related to a 1994 incident in Cleveland, Ohio where 45 cases of pulmonary hemorrhage in young infants occurred. Sixteen of the infants died. In addition, many state’s department of health administrations as well as the Center for Disease Control (CDC) list the following as symptoms associated with exposure to Stachybotrys mold spores:

1) Respiratory problems, such as wheezing, and difficulty in breathing

2) Nasal and sinus congestion

3) Eyes-burning, watery, reddened, blurry vision, light sensitivity

4) Dry, hacking cough

5) Sore throat

6) Nose and throat irritation

7) Shortness of breath

8) Chronic fatigue

9) Skin irritation

10) Central nervous system problems (constant headaches, memory problems, and mood changes)

11) Aches and pains

12) Possible fever

13) Diarrhea

14) Possible hemosiderosis

15) Immune suppression

Aspergillus flavus

 Aspergillus flavus is widely distributed in soil. It is associated with a wide range of stored products such as maize
A colony of Aspergillus flavus and nuts. In indoor environment it is commonly found on damp walls, wallpaper, floor and carpet dust, tarred wooden flooring, humidifiers and HVAC fans, bakeries, shoes, leather, and bird droppings. Strains of this mold may produce aflatoxin, a class 1 carcinogen.

The minimum and maximum temperature for growth are 6 and 45 oC, with an optimum at 40 oC. The minimum water activity is 0.78 and an optimum at 0.98.

 


 

 

 

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