A microscopic organism; those of medical interest include bacteria, viruses, fungi, yeasts, and protozoa.
An organism that can be seen only through a microscope. Microorganisms include bacteria, protozoa, algae, and fungi. Although viruses are not considered living organisms, they are sometimes classified as microorganisms.
An organism which cannot be observed with the naked eye; e. g. unicellular animals, lower algae, lower fungi, bacteria.
Living cells seen only with the aid of a powerful microscope. A general term referring to bacteria, molds and yeasts.
Any organism of microscopic size (i.e., requires a microscope to be seen).
Microscopic plants or animals.
An organism which can only be seen under a microscope and which may cause disease. Viruses, bacteria and protozoa are microorganisms.
Very small organism, usually visible only with a microscope; included among microorganisms are bacteria, viruses, rickettsiae, fungi, and protozoa.
Any organism too small to be visible to the naked eye. Microorganisms include *bacteria, some fungi, mycoplasmas, protozoa, rickettsiae, and viruses.
A microscopic plant or animal. Not all microorganisms cause disease, although germs and viruses are microorganisms that get a lot of attention.
A living organism too small to be perceived with the naked eye, especially a virus, bacterium, fungus, protozoan, or intracellular parasite, and some helminths.
An organism, such as bacteria and fungi, that can be seen only through a microscope. Although viruses are not considered living organisms, they are sometimes classified as microorganisms.
An organism that can be seen only through a microscope.
A minuscule life form that eludes the unaided human eye, being of such diminutive size that it remains imperceptible to naked vision.
A solitary living entity composed of a single cell. The majority of microorganisms are too minuscule to be observed without the aid of magnification. The principal categories of disease-inducing microorganisms encompass bacteria, viruses, protozoa, and fungi.
An organism, whether it be an animal or a plant, that is so minuscule that it can only be observed using a microscope.