How many species of mould exist?

There are as many as 5.1 million fungal species.

Not all types of mould are a threat, some types are fairly benign, and some even have medicinal uses. Penicillium is a good example, as it is used in the production of penicillin, an antibiotic commonly prescribed to cure bronchitis and other forms of infection.

The problem with there being so many species of mould is that differentiating toxic moulds from household moulds is nearly impossible for an untrained professional. If you discover mould growth in your home, you should call a professional mould removal company to inspect the area and determine if your home requires treatment.