Long ago Royal Rife looked into the nature of of molds. He found, when looking through powerful microscopes (he invented them), that molds actually take three forms in their life cycle. They are mold, fungi and bacteria. He also deduced that ANY of these three forms are a danger to human health if the forms live within our bodies. In particular, our immune systems will identify these hosts in our bodies and attempt to fight them as foreign invaders. However, there is one exception to that in the case of the mold form about one quarter of humans lack (genetically) the ability to mount a fight against these foreign molds contained in our bodies. In particular those peoples bodies do not interpret molds as foreign and thus accept their presence in them. Thus, the idea of polymorfism is clear. Molds, fungi and bacteria are ubiquitious, complex and incidious.
Molds in nature grow in the soil, they grow by ingesting the humus in the soil. Molds can be very small, actually many (there are at least 147 different types of harmful molds (among some 20,000 different types), (Source:National Mold Resource Center) and they are microscopic in size. Therein lies a SERIOUS problem, they live around us and permeate our buildings in large number. Once inside our buildings, they can invade our bodies by us breathing them in via our lungs. Given the small size, the molds get into our bloodstream and infect us. The molds can also lie in the lungs and throat. For some 75% of us this presents no problem because this population has a gene enabled ability to recognize these mold forms and expel them from our bodies. However, for 25% of us, they have no ability to see the mold as harmful and use the immune system to rid us of them. This means one forth of us are at risk of storing up the molds they ingest. We do not get very much mold from the foods we eat , not that they do not live in foods, rather our Agriculture Department and the Food and Drug Association have set standards for molds in food and we as a society adhere to those standards. Thus, the principal way in which we get molds into our bodies is through our lungs. Once having invaded our bodies they grow and give off chemicals. These by products of mold growth provides us with the concept of a micro toxin (of the larger class called bio toxins) This is the idea of a micro toxin which is a microscopic living mold that invades our bodies. Note just because the molds are very small does not mean they can not harm us for they can. They can create, over time, very serious disease conditions in our bodies for example Cancer, Fibromyalgia and Lyme's Disease among others. They also create infections and inflammation in our bodies. The conditions range from simple allergies to death. In particular, I have found that molds are not only only found within our buildings they are contained within our cars, including late model vehicles. They get into buildings in a very insidious manner they actually come up (from the ground) via the concrete slabs many of us live above. For more information please see the authors article "The Porous Nature Of Molds". The article can be found on this site. Just as concrete is porous to water, it is also porous to micro molds. For example suppose you live in a house that has a crawl space below, but has an attached garage (with a concrete slab) then through the doorway into a building comes the molds that are airborne from garage. Or, if one lives in a structure that has a basement with a concrete slab then the molds can get into the upper floors by way of the elevators and ducts used for heating and cooling. Note, molds grow on dust particles contained in our structures. Finally, it is well known that molds live in 50% of our structures (source : National Mold Resource Center). These buildings are commonly known as water damaged buildings or "sick buildings").