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  • Classification of TB cases based on history of Previous TB treatment

    Content
    • 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. 
    • Transferred In: A TB patient who is received for treatment in a Tuberculosis Unit, after registered for treatment in another TB unit is considered as a case of transfer in.
    • Transferred Out : A patient who has been transferred to another recording and reporting unit and whose treatment outcome is unknown.

  • Classification of TB on the basis of diagnosis

    Content

    On the basis of diagnosis, Tuberculosis (TB) can be classified into 2 main types:

    1. Microbiologically confirmed TB
    2. Clinically diagnosed TB

    Microbiologically Confirmed TB

    • Microbiologically confirmed TB refers to a presumptive TB case from which a biological specimen is positive for acid-fast bacilli/ Mycobacterium tuberculosis on smear microscopy, culture, or on a rapid diagnostic molecular test (such as Cartridge-based Nucleic Acid Amplification Test (CBNAAT)/ Truenat).
    • All such diagnosed cases should be notified at the source, regardless of whether TB treatment has started.

     

    Clinically Diagnosed TB

    • Clinically diagnosed TB refers to a presumptive TB case that is not microbiologically confirmed but has been diagnosed with active TB by a clinician who has decided to give the patient a full course of anti-TB treatment.
    • This definition includes cases diagnosed on the basis of X-ray abnormalities or suggestive histology or extrapulmonary cases without laboratory confirmation.
    • Clinically diagnosed cases subsequently found to be microbiologically positive (before or after starting treatment) should be reclassified as microbiologically confirmed.

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    Assessment

    Question​ Answer 1​ Answer 2​ Answer 3​ Answer 4​ Correct answer​ Correct explanation​ Page id​ Part of Pre-test​ Part of Post-test​
    TB is classified on the basis of diagnosis into which of the following? Microbiologically confirmed TB and clinically diagnosed TB Mono-resistant TB and poly-resistant TB Recurrent cases and previously treated cases None of the above 1 TB can be classified on the basis of diagnosis into 2 main types: Microbiologically confirmed TB and Clinically diagnosed TB. ​