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TB-HIV Presentation International Press Corp. E. Jane Carter, MD Associate Professor of Medicine Alpert School of Medicine at Brown University TB HIV Technical Consultant- AMPATH Partnership Eldoret, kenya. Outline of talk. Basic terminology and pathophysiology Epidemiology of TB and HIV

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tb hiv presentation international press corp

TB-HIVPresentation International Press Corp

E. Jane Carter, MD

Associate Professor of Medicine

Alpert School of Medicine at Brown University

TB HIV Technical Consultant- AMPATH Partnership

Eldoret, kenya

outline of talk
Outline of talk
  • Basic terminology and pathophysiology
  • Epidemiology of TB and HIV
  • Why entertwined?
  • Challenges of two diseases?
  • Question and (Maybe) Answers
tb transmission
TB Transmission
  • Tuberculosis is spread through the air
  • Index case must have the pulmonary form of the disease
    • Tb can cause disease anywhere in the body but only the pulmonary ( lung ) form is contagious to others
  • Index case breathes or coughs the germ into the air
    • MTB remains aerosolized for up to 6 hours
    • Others walking through the same airspace can become infected by breathing the contaminated air
stages of tuberculosis
Stages of Tuberculosis
  • Exposure
  • Infection
  • Disease
  • Contagion
  • Not every exposure results in infection
  • Asymptomatic state of being a germ carrier
  • 1/10 carriers will develop disease
  • Only pulmonary cases are contagious to others
tuberculosis treatment
Tuberculosis Treatment
  • TB infection can be cured by treatment with a single drug
    • IPT = isoniazid preventive therapy
    • Length of therapy is long ( 9-36 months)
  • TB disease must be treated with a combination of medications
    • Generally 4 drug for 2 months followed by 2 drugs for at least 4 months
      • For the simplest of cases
burden of tb
Burden of TB
  • 9.4 million new cases of TB disease per year
    • 1.1 million cases of co-infection
  • 2 million deaths
    • 380,000 in PLWHA
  • 1 infection per second
  • Leading cause of death in PLWHA
  • Leading cause of death in women of child bearing years globally
tb stages how does hiv affect these stages
TB Stages How does HIV affect these stages?
  • Exposure
  • Infection
  • Disease
  • Contagion
  • More likely to result in infection
  • 1/10 chance per year of developing disease
  • Severity increased in parallel to the HIV immunosuppression
  • Unclear if more or less contagious
tb hiv interactions
TB HIV interactions
  • People who are infected with both HIV and latent TB have a much higher risk of developing active TB
    • Annual risk of developing active TB of 5-10%
    • Lifetime risk of 50%
clinical concern
Clinical Concern
  • TB progresses faster in HIV-infected patients
    • More rapidly moves from infection to disease
    • More rapidly develops severe forms of disease
  • The rate of progression is determined by the immunosuppression of the HIV patient
  • TB is the earliest OI to occur in HIV, appearing at an increased rate even when the CD 4 count is still relatively preserved
  • TB in HIV-infected patients is more likely to be fatal if undiagnosed or left untreated
natural history pre haart
Natural History – pre HAART
  • 1992 Outbreak in an HIV Hospice
  • 12 cases December 1990-April1991
  • In the preceding 6 months 2 patients being treated for TB had been admitted
  • RFLP demonstrated all 12 matched but was a different strain than the previous 2
  • First of the 12 patients was the source case
  • Accelerated progression from exposure to death from TB in as short as 12 weeks
          • NEJM 1992;326:231-235
clinical concerns
Clinical Concerns
  • TB is harder to diagnose in HIV-infected patients
    • Patients become ill with lower organism burdens
    • PLWA have increased extrapulmnary disease
    • Diagnostic challenges
      • Contagious pulmonary cases are diagnosed by smear microscopy
      • Early disease may not be diagnosed by microscopy and require culture
      • Disease outside of the chest usually requires culture diagnosis
end result

END result

Autopsies show undiagnosed TB caused death in 14-54% of PLHIV

tb fuels hiv
TB fuels HIV
  • TB increases HIV load and hetergeneity, locally and systemically
  • Increases cytokines linked to HIV activation
  • Decreases cytokines that suppress HIV growth
  • Studies have varied on the clinical outcomes of TB on HIV
    • Adverse survival has been shown for TB/HIV patients versus HIV alone
    • HIV progression was not any faster when compared to other AIDS defining conditions (KS,PCP, esoph, candidiasis)
    • TB occurs at all levels of CD4 depression
treatment concerns
Treatment concerns
  • TB treatment involves for drugs
  • HIV treatment involves 3 drugs
  • Usually patients are on CPT as well to prevent other OIs
  • Translates into a minimum of 8 drugs
    • Adherence
    • Drug Interactions and Side Effects
treatment of tb disease
Treatment of TB Disease
  • In order to effect a cure, TB must be treated with at least two drugs to which the organism is susceptible.
    • Two drugs – the uncoupling of drugs leads to drug resistance
treatment concerns1
Treatment concerns
  • Because the treatment combinations are complex-
    • Questions were always should one treatment precede the other?
    • TB treatment could never be delayed due to risk of death but when?
is it necessary to treat concomitantly
Is it necessary to Treat Concomitantly?
  • Retrospective Studies
  • Madrid* Meta-analysis of 6934 patients
    • 63% increase in survival amongst patients initiating ART during TB therapy
  • Thailand** study of 1003
    • 20 X greater mortality risk in patients receiving only TB compared to those receiving ART/TB

*Velasco et. al. JAIDS 2009;50:148-52.

**Manosuthi et. al. JAIDS 2006;43:42-6.

is it necessary to treat concomitantly1
Is it necessary to Treat Concomitantly?
  • Prospective, open label, randomized Control trial, South Africa
  • Three arms
    • start ARV (EFV, dDI, 3TC) within 4 weeks of starting TB therapy
    • start ARV within 4 weeks of continuation phase of TB therapy
    • start ARV within 4 weeks of completing TB therapy
  • Arm 3 halted after enrollment complete

N Engl J Med 2010;362:697-706.


Reduction in mortality in combined treatment versus sequential therapy

    • 5.4 deaths/100 person years group 1 and 2
    • 12.1 deaths/100 person years group 3
      • hazard ratio in the combined integrated-therapy groups, 0.44
      • 95% confidence interval, 0.25 to 0.79; P = 0.003
  • Mortality lower in all cd4 stratifications
  • Adverse events in groups were not different
timing of therapy
Timing of therapy
  • IN HIV ARV timing of ARV initiation was timed to level of immunosuppression
  • 2009 WHO recommended ART for all TB patients – but when is best time to start?
  • NEJM Series of articles last week
    • For those with CD4 count < 50 immediate ART is beneficial in preventing death and further OIs
interactions are bidirectional
Interactions are bidirectional
  • HIV increases the risk of both primary and reactivation TB in both high and low burden settings
  • Risk of active TB increases with advancing HIV
  • TB as the initial AIDS defining illness in associated with an adverse outcome when compared to HIV+
we know what to do but how to do it
We know what to do….. But how to do it?
  • It appears to be beneficial to start early ART in TB patients…
  • Adherence?
  • Side effects?
  • Monitoring?
tb drug resistance
TB Drug resistance
  • Occurs by means of a genetic mutation
  • The genetic mutations occurs spontaneously and randomly in the environment
  • These mutations occur at know rates for each of the drugs
  • The mutations are independent of each other
acquisition of drug resistance
Acquisition of Drug Resistance
  • Primary Drug Resistance
    • TB Drug resistance that is present BEFORE the patient has started any TB drugs
      • The patient was infected with a resistant organism
  • Secondary Drug Resistance
    • TB Drug resistance that was not present when the patient started TB drugs but occurs while on therapy
      • Caused by uncoupling of the medications
        • Non adherence, poor drug formulation, malabsorption, etc.
but we have talked about
But we have talked about …………
  • Rapid progression of Tb in HIV patients.
  • Challenges of Diagnosis
  • Challenges of Treatment

So what does drug resistance imply for our HIV patients…..

xdr tb as a cause of death gandhi et al
XDR TB as a cause of death Gandhi et al.
  • Enhanced surveillance for drug resistance in KwaZulu Natal
  • Rural clinic
  • DOTS since 1993
  • Site of a demonstration project to treat HIV since 2004
enhanced surveillance
Enhanced Surveillance

Group 1 = per South Africa guidelines

Group 2 =consecutive patients on TB ward

Group 3 = consecutive TB suspects (9 months)

survival after sputum collection
Survival After Sputum Collection

52 of 53 patients died

Median survival 16 days ( range 2-210)

global response collaborative tb hiv activities
Global Response: Collaborative TB/HIV activities

B. To decrease the burden of TB in PLHIV- Three Is

B.1. Intensified TB case finding

B.2. Isoniazid preventive therapy

B.3. TB infection control in health care and other settings

A. Establish the mechanism for collaboration

A.1. TB/HIV coordinating bodies

A.2. HIV surveillance among TB patient

A.3. TB/HIV planning

A.4. TB/HIV monitoring and evaluation

C. To decrease the burden of HIV in TB patients

C.1. HIV testing and counselling

C.2. HIV preventive methods

C.3. Cotrimoxazole preventive therapy

C.4. HIV/AIDS care and support

C.5. Antiretroviral therapy to TB patients.

true challenges of tb hiv care

True challenges of TB HIV care

is the translation of scientific advancement into day to day practice

what i have tried to do for you
What I have tried to do for you….
  • Provide a foundation of terminology to build upon
  • Highlight the problems inherent in TB HIV care globally – across a gradient of disease and resources
  • Provide merely an introduction to the problem through which you can access the conference findings


Maybe there will be answers,

maybe not yet…..