In the current review, we discuss the most common types of CTB, namely PTB and EPTB (pleural/lymph nodal).
Cough greater than 2 weeks is the primary criterion to suspect PTB.
As per the World Health Organization (WHO) reports, 6.1 million cases of TB were notified by national TB programs in 2012, of which 5.4 million were new cases.
Of these, 2.5 million had sputum smear-positive pulmonary TB (PTB), 1.9 million had sputum smear-negative PTB, and 0.8 million had extrapulmonary TB (EPTB); case type was unknown in the remaining cases.
Sputum smear results take several days while culture results need several weeks.
Though various radiological modalities are widely used in evaluation of such patients, no imaging guidelines exist for the use of these modalities in diagnosis and follow-up.
Koch continued to improve his methods and techniques.
By solidifying liquids such as broth with gelatine and agar, for instance, he created a solid medium for growing bacteria which was easier to handle than the liquids used by Pasteur.
The radiological features depend on age, underlying immune status, and prior exposure.
[Figure 1] depicts the natural history and progression of the disease.