TB Case classification in NTEP

TB cases are generally classified on the basis of previous history of TB treatment into New and previously treated cases.

New case - A TB patient who has never had treatment for TB or has taken anti-TB drugs for less than one month is considered as a new case. 

Previously treated patients have received 1 month or more of anti-TB drugs in the past. They could be further classified as:

• Recurrent TB case - A TB patient previously declared as successfully treated (cured/treatment completed) and is subsequently found to be microbiologically confirmed TB case is a recurrent TB case. 
• Treatment After failure patients are those who have previously been treated for TB and whose treatment failed at the end of their most recent course of treatment.  
• Treatment after loss to follow-up - A TB patient previously treated for TB for 1 month or more and was declared lost to follow-up in their most recent course of treatment and subsequently found microbiologically confirmed TB case 
• Other previously treated patients are those who have previously been treated for TB but whose outcome after their most recent course of treatment is unknown or undocumented. 

Resources:

• Technical and Operational Guidelines for TB Control in India 2016

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