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    TB and Hansen's Disease Branch

    MC 1939
    P.O. Box 149347
    Austin, TX 78756-9347

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Epi Profile Section 4 - Case Diagnosis

Figure 3 Tuberculosis Cases by Diagnostic Method in Texas, 2017

Figure 3 Tuberculosis Cases by Diagnostic Method in Texas, 2017. Positive culture 768, positive NAA 128, clinical case 118, provider diagnosis 90, positive smear/tissue 23.


As shown in Figure 3, in 2017 TB was diagnosed by several methods: a positive acid fast bacilli (AFB) culture (68%), a positive nucleic acid amplification test (NAA) (11%), verified by a clinical case definition (10%), by a provider diagnosis (8%), and a positive AFB smear/tissue only (2%).  A clinical case is defined as a positive tuberculin skin test (TST) or a positive interferon gamma release assay (IGRA) for M. TB, signs and symptoms compatible with TB, treatment with two or more anti-TB medications, and a completed diagnostic evaluation.  A case is defined as provider diagnosis when a physician diagnosis a person suspected of having TB as active TB.[1]


[1] Centers for Disease Control and Prevention (CDC). Report of Verified Case of Tuberculosis Instruction Manual, 2009.  Atlanta, GA: US Department of Health and Human Services, CDC; 2019.


Table of Contents | An Overview of Tuberculosis in Texas | Distribution of Tuberculosis in Texas | Affected Populations | Case Diagnosis | Recent Transmission | Mortality | Risk Factors Associated with Tuberculosis | Drug Resistant TB | Targeted Testing | Reporting Requirements | References

Last updated June 25, 2019