|
.gif) |
Tuberculosis (Mycobacterium tuberculosis)
1990 Case Definition
Clinical description
A chronic bacterial infection due to Mycobacterium
tuberculosis, characterized pathologically by the formation
of granulomas. The most common site of infection is the lung,
but other organs may be involved.
Clinical case definition
A case that meets the following criteria:
- A positive tuberculin skin test
- Other signs and symptoms compatible with tuberculosis,
such as an abnormal, unstable (worsening or improving) chest
x-ray, or clinical evidence of current disease
- Treatment with two or more antituberculosis
medications
- Completed diagnostic evaluation
Laboratory criteria for diagnosis
- Isolation of M. tuberculosis from
a clinical specimen, or
- Demonstration of M. tuberculosis from
a clinical specimen by DNA probe or mycolic acid pattern on
high-pressure liquid chromatography, or
- Demonstration of acid-fast bacilli in clinical
specimen when a culture has not been or cannot be obtained
Case classification
Confirmed: a case
that is laboratory confirmed or, in the absence of laboratory
confirmation, a case that meets the clinical case definition
Comment
A case should not be counted twice within any consecutive
12-month period. However, cases in which the patients had verified
disease in the past should be reported again if the patients
were discharged. Cases also should be reported again if they
were lost to supervision for greater than 12 months and disease
can be verified again.
Mycobacterial diseases other than those caused
by M. tuberculosis should not be counted in tuberculosis
morbidity statistics unless there is concurrent tuberculosis.
See also:
Printable
Version |
|
