One of the mysteries of the English language finally explained.
The first identified case in a group of related cases of a particular communicable or heritable disease.
- ‘The numbers are large because we were unable to identify the index case.’
- ‘Almost all positive index cases identified through the screening programme were confirmed to have been successfully treated.’
- ‘There were 72 index cases of tuberculosis, 46 of whom had positive sputum smears for acid-fast bacilli.’
- ‘Influenza A was confirmed in 510 index patients; 395 (77 percent) of these completed the household contact follow-up protocol.’
- ‘Public health departments aren't likely to be the ones diagnosing and identifying an index case of smallpox.’
- ‘Four of his family members developed the infection; the brother of the index patient had the earliest date of onset.’
- ‘The fifth cluster of infection was the family of the index patient.’
- ‘All participating subjects gave written, informed consent and were interviewed about exposure to the index case and BCG vaccination status.’
- ‘Their infection may not be related to the index case, but may reflect the prevalence of the infection in the local community.’
- ‘We found no studies comparing index patients given chemoprophylaxis with those who were not.’
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