What are the four types of organisms that cosmetologists must know and remember?

Cosmetologists must be familiar with four types of organisms: bacteria, viruses, fungi, and parasites. Bacteria can be beneficial or harmful and play a role in skin health. Viruses, such as those causing infections, can impact client safety. Fungi, including molds and yeasts, can lead to skin conditions, while parasites, like lice, require specific treatment and prevention measures.