a living cell in which a virus multiplies

(of a disease) spread from one person or organism to another by direct or indirect contact

(of a disease) prevalent over a whole country or the world

the surroundings or conditions in which a person, animal, or plant lives or operates

the branch of biology that deals with the relations of organisms to one another and to their physical surroundings

a population, tissue, etc, that is chroically infested with the causative agent of a disease and can act as a source of further infection

the branch of medicine which deals with the incidence, distribution, and possible control of diseases and other factors relating to health

objects or materials which are likely to carry infection, such as clothes, utensils, and furniture

an infective agent that typically consists of a nucleic acid molecule in a protein coat, is too small to be seen by light microscopy, and is able to multiply only within the living cells of a host

a member of a large group of unicellular microorganisms which have cell walls but lack organelles and an organized nucleus, including some which can cause disease

a microscopic organism, especially a bacterium, virus, or fungus

the smallest structural and functional unit of an organism, typically microscopic and consisting of cytoplasm and a nucleus enclosed in a membrane.

(of a disease) spread from one person or organism to another by direct or indirect contact

a medicine (such as penicillin or its derivatives) that inhibits the growth of or destroys microorganisms

a living cell in which a virus multiplies

the action or state of making or being made impure by polluting or poisoning

the process of incubating eggs, cells, bacteria, a disease, etc

a supposition or proposed explanation made on the basis of limited evidence as a starting point for further investigation

a bacterium, virus, or other microorganism that can cause disease

an illness, typically a minor one

a disease or period of sickness affecting the body or mind

conditions or practices conducive to maintaining health and preventing disease, especially through cleanliness

a disorder of structure or function in a human, animal, or plant, especially one that produces specific signs or symptoms or that affect a specific location and is not simply a direct result of physical injury

(of a disease) predicted to lead to death, especially slowly; incurable