A group of one-celled organisms that generally do not contain chlorophyll, including amoebae, paramecia, flagellates, and certain spore-forming organisms, sometimes classified as one-celled animals.
A disease that cannot be transmitted from one animal to another.
Center for Disease Control.
A lower order of plant organisms, excluding bacteria, which contains no chlorophyll, has no vascular system, and is not differentiated into roots, stems, or leaves. Fungi are familiar as molds, rusts, smuts, rots, and mushrooms.
A disease that cannot be transmitted from one animal to another
Food Safety and Inspection Service
In the general sense, anything capable of causing disease, but when referred to by most veterinarians and physicians it signifies a living, microscopic, disease-producing agent such as a bacteria or virus.
A disease transmitted or spread from animal to animal, person to person, or from plant to plant, by direct or indirect contact with the diseased plant or animal.
Spread of disease by direct or indirect contact.
A regulation under police power for the exclusion or isolation of animal and plant pests or diseases and insects: a) the isolation of an animal sick with a contagious disease; b) a place where the sick are detained away from other animals until the danger of spread of a contagious disease has disappeared.
Any organism, plant or animal, in or upon which another spends part or all of its existence, and from which it derives nourishment or protection.
Single-celled microorganisms; some cause human, animal, or plant diseases; others are beneficial.
To control or direct by a rule, principle, method, etc.
Any deviation from a normal state of health in plants, animals, or people, which temporarily impairs vital functions. It may be caused by viruses, pathogenic bacteria, parasites, poor nutrition, congenital or inherent deficiencies, unfavorable environment, or any combination of these.
Environmental Protection Agency
A self-reproducing agent that is considerably smaller than a bacterium and can multiply only within the living cells of a suitable host. Most viruses are too small to be seen with the aid of the ordinary microscope.