A microbe is a living organism too small to be seen by the human eye without the use of a microscope. Microbes can be bacteria, mold, mildew, or fungus. A virus is technically not a microbe, because it is not alive, however, it is generally accepted as a class of microbe, which may be inactivated. Typical examples of microbes of common concern are Methicillin-resistant Staphylococcus aureus (MRSA), the Human rhinovirus (common cold), Steptococcus pyogenes (strep), Legionella pneumophilia (Legionnaires disease), Human Coronavirus (SARS surrogate), and Feline Calicivirus (Norwalk virus).
Antimicrobial is best because it is effective against a broad spectrum of microbes and even some yeasts.
Fungi (mold & mildew): This image compares untreated polyester fiber versus Naturion™ treated fiber after exposure to fungi (mold & mildew) for 28 days. While the untreated fiber grew a significant amount of mold, the Naturion™ treated fiber remained clean.