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a nonexperimental research design using an epidemiological approach in which previous cases of the condition are used in lieu of new information gathered from a randomized population. A group of patients with a particular disease or disorder, such as myocardial infarction, is compared with a control group of persons who have not had that medical problem. The two groups, matched for age, sex, and other personal data, are examined to determine which possible factor (e.g., cigarette smoking, coffee drinking) may account for the increased disease incidence in the case group. See also retrospective study.
case-con·trol study(kās-kŏn-trōl stŭdē)
Epidemiologic method that begins by identifying people with a disease or condition of interest and compares their past history of exposure to identified or suspected risk factors with the past history of similar exposures among those who resemble the cases but do not have the disease or condition of interest.
in epidemiology, an animal which has the specified disease or condition which is under investigation.
a structured summary of a case report suitable for computer entry; permits machine sorting and retrieval and leads an investigator to the original paper records on which detailed descriptions must be based.
selection of cases as a sample to use in a case-control study (below).
a retrospective, analytical, epidemiological study. A group of pre-existing cases of the disease are matched with a selected group of control animals that do not have the disease so that the presence or otherwise of an hypothesized disease determinant can be ascertained in both groups.
case fatality rate
the proportion of cases with a specified condition which die within a specified time.
the strategy of surveying a population to find the sick animals that are the foci of infection; an essential early step in the eradication of any disease.
the collected data concerning an individual, contact and related animals, environment and management procedures, including any past medical history and any other information that may be useful in analyzing and diagnosing the case or for instructional or research purposes.
the first case recorded in an outbreak.
care of a sick animal including specific and supportive medication, surgical intervention, housing, bedding, nutrition, restraint, collection of specimens for submission to laboratory or stall-side tests.
the group of animals in the total population which are sick or infected, as distinct from the control population, which are not sick or infected.
entry in records of the clinical findings of individual sick animals. May be structured or unstructured, paper or machine, with or without the accounting record for the case.