Index case

Index case

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AIDS index case graph

The index case, also known as the proband or patient zero, is the initial patient in the population of an epidemiological investigation, or the first case of a condition or syndrome to be described in the medical literature. In genetics, it refers to the first identified case of a genetic disorder in a family.

Identification

Identifying the index case is crucial in epidemiology and genetic studies because it can help to understand the origin and dynamics of disease spread. The index case is typically identified by a thorough family history and, if necessary, genetic testing.

Significance in Disease Control

The identification of the index case in disease outbreaks is important for disease control and prevention. This allows for the immediate isolation of the case, a detailed investigation of the case's contacts, and prevention of further disease transmission.

Significance in Genetic Studies

In genetic studies, the index case can help identify potential genetic disorders within a family. This can lead to better understanding of the disease, development of treatment strategies, and potential preventive measures for at-risk family members.

Ethical Considerations

• Identifying and managing an index case can involve ethical considerations. This includes maintaining patient confidentiality, obtaining informed consent for testing and data use, and addressing potential psychological impacts.

See Also

• Epidemiology
• Genetic disorder
• Patient Zero
• Contact tracing

Further reading

• Genetic counseling
• Disease outbreak

External links

• CDC - Principles of Epidemiology
• NIH - Role of a Genetic Counselor

Index case Resources
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