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How Much Indoor Mould Is Too Much In A Building?

Jackson Kung'u

They say “the dose makes the poison”. But what’s the dose for indoor mould? Currently there is no answer to this question. Determining this dose would be a difficult task for a number of reasons:

  • There are several species of moulds with differing health effects.
  • People are not just exposed to mould but also to other environmental pollutants including bacteria, protozoa, dust mites and non-biological compounds.
  • Some people are highly sensitive to mould even at concentration levels that may be considered ‘normal’.

It is generally accepted that no amount of mould should be allowed in occupied dwellings. However, it is impractical to get rid of all the mould in a building. A number of organisations have provided some guidelines in the past on what levels of mould would be considered a problem in occupied dwellings. But none of these guidelines have been accepted widely and some have even been dropped as more information concerning indoor mould became available. Below is a summary of some of these guidelines.

In 1989, the American Conference of Governmental Industrial Hygienists (ACGIH®) had considered fewer than 100 colony forming units per cubic meter of air (CFU/m3) as of no concern. For duct insulation, the Department of Environmental Health and Safety (DEHS) of the University of Minnesota, considers 10,000 CFU/gram as low, 10,000 to 100,000 CFU/gram as medium, 100,000 to 1,000,000 CFU/gram as medium to heavy and > 1,000,000 as heavy contamination. The Health Canada Technical Guide, 1993, states that if more than 50 CFU/m3, of the same species other than Cladosporium or Alternaria were detected in indoor air, there may be reason for concern. It also states that up to 150 CFU/m3 would be acceptable if there was a mixture of species reflective of outdoor air. Also, up to 500 CFU/m3 would be acceptable in the summer, if the species present were primarily Cladosporium.

There are other guidelines. The German Federal Environmental Agency (Umweltbundesamt, 2002) has probably the most comprehensive guidelines. Unfortunately the guide is only available in German language.

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Filed Under: Fungi Tagged With: indoor mould

The Bright Side of Mould

Jackson Kung'u

In recent years we have been hearing a lot concerning the health effects associated with mould. Few people would think of the numerous benefits we get from mould.

First, mould contributes immensely to the decomposition of organic matter hence helping in recycling of nutrients. Imagine the mountains of garbage we could be having (unless we burn it) without the help of mould and other soil micro-organisms. Moulds also play an important role in waste treatment and the breaking down of pesticides.

Mould Contribution to Food Industry

Hardly do we think the mushrooms that we so much enjoy eating belong to the same group as the moulds, i.e., the fungi. As a small boy, we used to eat the smutted inflorescence of sorghum. I can only imagine the billions of spores of the fungus we ate and probably helped in spore dispersal. We never got sick! What about our favourite blue cheese? Some people may not be aware that it is made with the help of a mould called Penicillium roquefortii. Other cheeses such as Camembert and Brie are ripened by Penicillium camembertii. Some sweet wines such as the Sauternes are made from grapes infested by a mould called Botrytis cinerea. In the Far East there are a number of popular foods and sauces processed with the help of moulds. Tempeh for example is made by inoculating soybean with Rhizopus oligosporus and leaving the mould to colonize the soybean for some time. A high-protein meat-like product called ‘Qourn’ is made from a strain of Fusarium venenatum.

Mould Contribution to Human and Veterinary Medicine

Probably not many people know that the first antibiotic ever, penicillin, discovered by Sir Alexander Fleming in 1927, is produced by moulds within the genus Penicillium (primarily Penicillium chrysogenum). There are other antibiotics, antifungal compounds, cholesterol-reducing drugs, immunosuppressant compounds, and important enzymes from moulds.

Mould Contribution to Crop Protection

Some moulds have been used successfully in biological control of agricultural pests and diseases. Fusarium oxysporum fsp. cannabis, for example, is used as bioherbicide against marijuana plants while Beauveria bassiana is widely used in formulation of bio-insecticides.

Do you have a question on mould? Send it to My Question.

Filed Under: Fungi Tagged With: Beauveria, Fusarium, mushrooms, penicillin, Penicillium camembertii, Penicillium chrysogenum, Penicillium roquefortii, Rhizopus oligosporus

It Is Not Mould Today: Let’s Think Father’s Day!

Jackson Kung'u

(This article is from Medical News Today)

Men have nipples to sooth crying baby until it can be fed

13 Jun 2005

A father’s nipple is perfectly suited to soothing a crying baby until it can be fed, according to a major report published for Fathers’ Day (June 19) on fatherhood across five continents, which identifies the world’s best dads.

FatherWorld, published by Fathers Direct, the UK national information centre on fatherhood, details a worldwide increase in active fathering. It names as “Best Dads in the World” the Aka Pygmies, a hunter-gatherer tribe from northern Congo, in central Africa. When the mother is not available, the father calms his baby by giving him a nipple to suck.

Aka Pygmy men do more infant care-giving than fathers in any other known society, finds the report. On average, they hold or are within arms’ reach of their infants 47 per cent of the time. They beat Swedish dads, the number ones in the Western world, who average 45 per cent of parental childcare. In typical British families, dads now average a third of the parental childcare, according to latest research from the Equal Opportunities Commission. Worldwide, fathers are estimated in today’s report to contribute between a quarter and a third as much time as women to direct childcare. However, FatherWorld, springing from a week-long summit at Oxford University of the world’s academic experts on fatherhood, reports that, of 156 cultures studied, only 20 per cent promote men’s close relationships with infants, and only 5 per cent with young children.

Aka fathers often take the child along when they go drinking palm wine. They may hold the baby close to their bodies for a couple of hours at a time, says the report which highlights findings by Barry Hewlett, an American anthropologist, who has studied the tribe for more than 20 years. The dads, rather than mums, are often the ones who settle the babies if they wake at night.

Sebastian Kraemer, child psychiatrist at London’s Whittington Hospital, said: “It is possible that, in prehistoric societies, this was a normal way of fathering. We should not assume from 10,000 years of history that our prevailing model is the right one.”

Caroline Flint, former President of the Royal College of Midwives, said: “I have come across cases of dads doing this. It’s not a case of the man saying to the baby, ‘Here you are, have my boobie,’ but usually of the baby snuffling along the father’s chest, finding the nipple and sucking. The men are usually very surprised, but the babies seem content. They love to snuggle up to their dads.”

Wayne Hemingway, designer and father of four, said: “I’m not sure I could be an Aka Pygmy dad. Placing nipper on the nipple could be a big challenge to the British male. Ray Mears should take a group of British dads and their babies out to the Congo for a couple of weeks to meet the Aka Pygmies and see what our dads can manage. But I am one dad who won’t be trying it out.”

Michael Lamb, professor of psychology at Cambridge University and the world’s leading academic expert on fatherhood, said: “Internationally, over the past 20 years, we have seen fathers who live with their children spending more time with them and doing more diverse activities not just in Britain but in every known society. However, we are also seeing another trend – increasing numbers of children who are fatherless for much of the time because of factors such as migrant labour, fragile relationships and divorce.”

Duncan Fisher, chief executive of Fathers Direct, said: “We are beginning to recognise that a revolution in paternal involvement with children is sweeping not just Britain but the world with huge potential benefits for families and for eradicating poverty and ill-health.”

In FatherWorld, Dr Patrice Engle, who leads the UN’s fatherhood programmes, describes how UNICEF has recently created new projects in dozens of countries to support fatherhood because of the latest evidence about its impact on child poverty, breastfeeding and education. Dr Engle said: “Perhaps the largest set of resources – money, time, food and caring – that could be directed to children are those controlled by men in families.”

Interesting facts from FatherWorld

— Countries all around the world are showing increased levels of actual engagement by fathers (ie time spent actually doing things with kids). For example, in the US, in the 1960s, fathers did about 25 per cent as much as mothers – by the late 1990s that had risen to between 55 and 70 per cent. In Canada, the increase between 1986 and 1996 was from 50 to 65 per cent. In the UK, according to EOC research, father engagement has risen by eight times in the last 30 years.

— Studies of 156 cultures found that only 20 per cent promoted men’s close relationships with infants, and only 5 per cent with young children.

— Few countries have provision for leave or financial considerations for fathers on the birth of their children. In Egypt, women receive leave to care for their children. Men are entitled only to leave to care for their parents.

— In Nicaragua and parts of the Caribbean, a father’s loyalty is primarily to his own mother and only then to his wife and family.

— Between 10 and 30 per cent of developing country households are officially defined as female -headed. In countries with the highest rates of men’s migration and/or low marriage rates, such as the Caribbean, the proportion can range up to 50 per cent.

— In the Latino gangs of Los Angeles, becoming a father is almost the only way to leave the gang alive.

— UK evidence indicates that high levels of father involvement early on predict more examination passes for their children at age 16 and lower likelihood of a criminal record by age 21 as well as long-term mental health and marital satisfaction in later life.

— Evidence from many countries indicates that fathers’ motivation to end violence towards their children’s mothers is substantially enhanced when the impact of domestic violence on their children is explained and explored.

— FatherWorld is published by Fathers Direct, price £5.95. For copies call 0845 634 1328 or go to www.fathersdirect.com The report springs from a week-long conference at Oxford University of the world’s experts on fatherhood from more than 20 nations.

— Fathers Direct, the UK national information centre on fatherhood, is a charity, working to support positive relationships between men and their children. www.fathersdirect.com Fathers Direct, Herald House, Lambs Passage, Bunhill Row, London EC1Y 8TQ. Contact: Jack O’Sullivan, 01608 737125/ 07779 655585 or j.osullivan@fathersdirect.com http://www.fathersdirect.com

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Filed Under: Fungi Tagged With: pygmy

Training Seminars on How to Recognize Indoor Mould, Develop Effective Sampling Strategies and Interpret Laboratory Results

Jackson Kung'u

Mold & Bacteria Consulting Laboratories (MBL) Inc. is now offering one-day training seminars on how to recognize indoor mould, how to develop effective sampling strategies and how to interpret laboratory results. If you have been considering attending a similar course, don’t delay to register as we have limited spaces left!

Three Reasons Why You Should Attend

  • The course equips you to fully deal with all aspects of indoor mould sampling and interpreting laboratory reports.
  • You will have a chance to discuss and get possible solutions of some of the difficult situations or questions you encounter while doing mould investigations.
  • You will have an opportunity to learn from others experience.

The course would benefit industrial hygienists, environmental consultants, general contractors, cleaning and restoration contractors, property managers, insurance, financial, and legal professionals who deal with mould issues, and other professionals or anyone interested in increasing their knowledge or developing their decision-making skills related to indoor mould.

For course details, please visit their website at http://www.moldbacteria.com

MBL, Inc. has become one of the premier providers of quality laboratory testing services for mould and bacteria in Canada. MBL offers convenient, rapid turnaround time, competitive pricing and value-added services unavailable at other laboratories, such as free technical information, consulting with the client on the most appropriate test samples and test methods, provide help with the interpretation of results, provide services after working hours if required and provide free unlimited after sales consultation.

Please call (905)290-9101 or visit their website at http://www.moldbacteria.com for details of their services.

Filed Under: Fungi, Indoor Air Quality, Microbial Sampling Tagged With: mbl, mold bacteria consulting laboratories, mold course, mold samples, mold training, mould course, mould sample, mould training

Water Damage in Your Home – How to avoid mold, minimize damage – and deal with your insurance agent!

Jackson Kung'u

Canada Mortgage and Housing Corporation (CMHC) has provided a series of steps you can take if your home has experienced extensive water damage. These are:

  • First, call your insurance broker or agent and report the water damage within 24 hours or less, to allow for quick drying and repairs.
  • Next, hire a professional contractor to clean up the water and make repairs as soon as possible. The contractor reports to and is paid by you, but your insurance adjuster can make recommendations.
  • As the work progresses, make sure the adjuster and contractor follow the best possible procedures to look after your concerns. A fast, thorough cleanup will help avoid mold growth and significantly reduce cleanup costs. So when selecting a contractor, look for qualities like speed, competence in water cleanup practices and certification or training in water damage restoration and mold remediation.
  • Make sure the moisture source is stopped, and all wet areas are completely dry. Wet items that can’t be salvaged should be removed, and what can’t be removed must be dried quickly, preferably within 48 hours to minimize the growth of mold. Be sure all cavities and crawl spaces are dry. And confirm that no refinishing is done until the entire area is thoroughly dried.
  • If you have mold growth, make sure it is removed safely by the contractor, and that there is no remaining mold anywhere in your house, including behind wallpaper, in areas adjacent to the mold growth or where water may have seeped (such as wall cavities, basement subfloors and crawl spaces), and under carpeting.
  • Finally, make sure that all repairs and cleaning have been completed thoroughly and properly before you tell your adjuster that you are satisfied.

You could find more information at www.cmhc.ca

Any mould question? Please send it to us at My Question.

Filed Under: Fungi Tagged With: cmhc, insurance, mould growth, water damage

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