The general yeast infection facts that you must know...

What is yeast?
Yeast is a fungus, so it is a close cousin of mushrooms, toadstools,
truffles and puffballs. According to current scientific research, over
100,000 different types of fungus have already been identified, but
some estimates suggest that as many as 1.5 million different strains of
fungi could exist.
Fungi are not plants, because they lack the chlorophyll that is a primary
characteristic of plants. Another factor that distinguishes fungi from
plants is their inability to make their own food.
They inhabit climates that range anywhere from cool to tropical, and
can be found even in the air that we breathe every day. Fungi will most
commonly be found in moist environs, so that they thrive in leftover
foods and fruit materials, damp, windfall leafs, soil, manure, brackish
water and any other similar environment where nourishment is readily
available.
Many fungi are ‘good’ as far as man is concerned. For example, in
addition to mushrooms and truffles, without fungus we would have no
bread or beer, because it is the yeast that is added to the bread or beer
making process that turns it into what it eventually becomes. Without
fungus, the world would be one enormous landfill site, because it is
fungus that breaks down trash and thereby returns it to the constituent
parts that are eventually returned to the soil.
So, fungi have many characteristics for which we should be grateful.
That is not however always true…