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Prevalence of TB Infection
Learning ObjectivesDefinition of Prevalence of TB Infection.
Stats around India and world.
Prevalence of TB infection  The number of persons living with TB infection in a given population during a given time is called the prevalence of TB infection.
It may be expressed in absolute number for a given population or as a rate per a defined denominator, commonly percentage.
TB infection should not be confused with TB disease as only a fraction of those infected by TB will develop active TB disease.
The global prevalence of TB infection:
 Various studies have show that the prevalence of TB infection globally is 25%. In other words, onefourth of the world population is infected with TB bacilli.
India: India has the highest estimated burden of TB infection globally, with approximately 350400 million people living with TB infection. Crude prevalence of TB infection among population age ≥15 years was found to be 31.3% (Based on NTB Prevalence Survey Report, 2021).
References
 The Global Burden of Latent Tuberculosis Infection: A Reestimation Using Mathematical Modelling, Plos Medicine, 2016.
 National TB Prevalence Survey in India (20192021) Summary Report, NIRT, ICMR, NHM, MoHFW, GoI.

Question  Answer 1  Answer 2  Answer 3  Answer 4  Correct answer  Explanation  Page ID  Part of Pretest  Part of Posttest 
The prevalence of TB infection can be measured by nationallevel surveys or estimated by mathematical modelling.  True  False  1  Prevalence is preferably measured directly from national population surveys. When this is not feasible, mathematical modelling can be used to indirectly estimate the prevalence.  Yes  Yes 
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