TB Case definition
Tuberculosis (TB)
An illness in humans caused by several bacterial microorganisms (species) belonging to the M. tuberculosis complex. The most common and important agent of human disease is M. tuberculosis and can affect any part of the body, creating parenchymal (tissue) damage. It is broadly referred to in the literature as ‘Tuberculosis disease’ or ‘active tuberculosis’.
Tuberculosis disease
The preferred term is tuberculosis (TB).
Transfer in
Person who was originally registered in another basic management unit (BMU) tuberculosis register but transferred to the current BMU to continue care.
Treatment after failure patients
Persons previously treated for tuberculosis and whose treatment failed at the end of their most recent course of treatment.
Treatment after loss to follow-up patients
Persons who have previously been treated for tuberculosis and were declared lost to follow-up at the end of their most recent course of treatment.
Subclinical tuberculosis
Tuberculosis detected by microbiologic investigation in the absence of self-reported tuberculosis-related symptoms with or without radiological abnormalities.
Tuberculosis case
In the context of surveillance, it refers to the occurrence of tuberculosis in a person. In clinical medicine or when referring to a particular person with tuberculosis, the term “case” should be avoided. In the latter context, the term patient should be used.
Pulmonary tuberculosis (PTB)
Any bacteriologically confirmed or clinically diagnosed case of tuberculosis involving the lung parenchyma or the tracheobronchial tree, including tuberculous intrathoracic lymphadenopathy. A person with both PTB and extrapulmonary TB should be classified as having PTB.
Presumptive tuberculosis
Condition in which a person has symptoms or signs suggestive of tuberculosis.
Previously treated patients
People who have previously received 1 month or more of anti-tuberculosis drugs. Previously treated people may have been treated with a first-line regimen for drug-susceptible tuberculosis or a second-line regimen for drug-resistant forms.
