A disease that is able to be passed from one person to another.

A breakdown in the structure and function of an organism.

An infectious agent of a disease is present in this organism apart from the presence of the symptoms of the disease.

Someone who traces the spread of a disease through a population.

A possible explanation for observations and/or data that may be tested.

A system of principles that can guide decisions and practice in terms of whether something is right or wrong.

Period of isolation that is used to control the spread of an infectious disease.

An organism that spreads disease-causing microbes from one host to another without getting sick itself.

To enlarge an image of an object.

A microscopic cellular organism.

The smallest structural unit enclosed by a membrane that makes up all organisms.

Cells are the basic units of structure and function in all living things.