TB Intensive San Antonio, Texas
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1 TB Intensive San Antonio, Texas August 2-5, 2011 Pediatric TB Jeffrey Starke, MD August 5, 2011 Jeffrey Starke, MD has the following disclosures to make: Is on a data safety monitoring board for Hoffman La Roche No relevant financial relationships with any commercial companies pertaining to this educational activity 1
2 TUBERCULOSIS IN CHILDREN Jeffrey R. Starke, M.D. Professor of Pediatrics Baylor College of Medicine Houston, Texas Tuberculosis is a social disease with medical implications. 2
3 3
4 THE GREAT PARADOX OF TUBERCULOSIS A CAUTIONARY TALE By the use of drugs and BCG vaccines, we can Cure tuberculosis disease [for less than 75 dollars] Prevent progression of tuberculosis infection into disease Prevent a significant proportion of life-threatening childhood tuberculosis [by BCG vaccination] Yet, tuberculosis remains one of the three greatest infectious disease menaces for humans, and our inability to control it is our biggest public health failure. 4
5 TUBERCULOSIS CASES IN THE UNITED STATES CHILDREN 0-14 YEARS OLD 1,800 1,600 1,400 1,200 1, RISK FACTORS FOR TUBERCULOSIS Increased risk of acquiring or having infection Foreign born from high prevalence country Intravenous drug or crack cocaine user Family history of TB (2-3 generations) Contact with HIV- infected individuals Contact with inmates of prison or jail (past or present) Some nursing homes, residential living Some healthcare workers Increased risk of developing disease after infection HIV infected Immune suppression - drugs or disease Recent (<3 years) infection Certain diseases: silicosis, diabetes mellitus Extremes of ages: infants, elderly 5
6 SOME REASONS WHY TUBERCULOSIS SURGED IN THE UNITED STATES HIV co-epidemic Immigration increased pool of infection and disease Congregate settings Poor tuberculosis control MONOCLONAL ANTIBODIES TUBERCULOSIS Remicade (Infliximab) monoclonal antibody against tnf alpha black box warning for tuberculosis 84 cases by 10/01 severe pulmonary, G-I and disseminated tuberculosis must do at least a TB risk assessment and TST prior to use Humira (adalimumab), Enbrel (etanercept) less information known strong warning to assess for TB risk and place a TST 6
7 TIME TABLE OF CHILDHOOD TUBERCULOSIS Site of Disease Time to Develop Miliary and meningeal 1-9 months Primary pulmonary 2-12 months Lymph node [cervical] 2-12 months Pleural effusion Skeletal Renal 3-9 months 6 months 2 years 1-5 years Average age specific risk for disease development following primary infection (pre- BCG) 100% 90% 80% 70% 60% 50% 40% 30% 20% 10% 0% 0-1 year 1-2 years 2-5 years 5-10 years >10 years Miliary or TBM Pulmonary No disease Adapted from Marais B, et al. Int J Tuberc Lung Dis
8 TRANSITIONS IN TUBERCULOSIS Susceptible Exposed Infected Diseased Sick Diagnosed Treated Cured 8
9 ARE CHILDREN WITH TUBERCULOSIS EVER CONTAGIOUS? Difficult to answer in the community Orphanages caretaker with TB led to transmission; a child with TB did not Schools only 2 reported epidemics caused by children <13 years old Children s Hospitals rare case reports of transmission, all with special circumstances, none has been patient - to - patient FEATURES OF CONTAGIOUS PEDIATRIC TUBERCULOSIS Cavitary lung lesion Sputum production Positive acid-fast stain of sputum smear Bronchoscopy Draining lesions or surgical drainage of an abscess 9
10 DIAGNOSIS OF TUBERCULOSIS All existing diagnostic tests for TB in children have significant ifi shortcomings Most tests are not available in settings where the vast majority of TB cases are diagnosed The utility of most tests is further diminished in children with immune compromise [especially HIV infection] DIAGNOSTIC TESTS FOR CHILDHOOD TUBERCULOSIS The sensitivity and specificity of the available tests are inherent in the tests However, the positive and negative predictive values are inherent in the population on whom the tests are used Therefore, all tests are more accurate when used on children with a high index of suspicion [epidemiology HISTORY OF RECENT CONTACT TO A TB CASE -or suspicious symptoms] 10
11 Sensitivity = Specificity = 95% 90% prevalence 1% prevalence PPV= 99% (1% false+) PPV=15% (85% false+) MANTOUX TUBERCULIN SKIN TEST uses 5 TU [2 TU if R23] of purified protein derivative interpret in hours record size of induration in mm if it makes a reaction at >72 hrs, it counts! false negatives: 10% to 20% in disease 11
12 FACTORS THAT CAUSE DECREASED RESPONSE TO TUBERCULIN Host-related Infections, vaccines Chronic disease, malnutrition Immunosuppressive diseases (HIV, malignancy, CVD) Drugs (corticosteroids) Extremes of age, stress Overwhelming tuberculosis Tuberculin - related Improper storage or dilution Adsorption to glass or plastic Administration - related Reading - related 12
13 INDURATION SIZE POSITIVE TUBERCULIN SKIN TEST > 5mm HIV co-infection Immune compromise Recent contact to TB Suspected disease > 15 mm > 10 mm Foreign-born from a HR country Drug users Living in HR congregate setting Specific HR groups Children < 4 yrs old (AAP) No risk factors Previous BCG vaccination? 13
14 INTERACTION OF BCG VACCINES WITH THE TUBERCULIN SKIN TEST 50% of vaccinated infants do not react to a TST; most of the rest stop reacting within 5 years most non-infants who get one or more BCG vaccinations will react to a TST (usually < 15 mm), but effect wanes over 5 10 years CURRENT DOGMA: outside infancy, positive TST more likely to indicate infection with M. tuberculosis than be residual from BCG TUBERCULIN SKIN TESTING OF FOREIGN-BORN ADOPTEES On one hand, most children have received a BCG vaccine within the past year, which can cause reaction to a TST On the other hand, many have lived in conditions conducive to transmission of M. tuberculosis and we can t do an investigation 14
15 TUBERCULIN SKIN TESTING OF FOREIGN-BORN ADOPTEES General Guidelines 1. Assess for symptoms of tuberculosis disease prolonged (>2 wk) cough, weight loss, fevers 2. Note a BCG scar and/or immunization records 3. Place and read a 5 TU TST without controls 4. Delay or repeat the TST if the child is significantly malnourished 5. Positive TST reaction is 10mm, though this will result in some overtreatment due to recent BCG vaccination 6. Treat LTBI with isoniazid unless specific evidence of INH-resistance is uncovered Interferon tests o o o o MTB specific antigens: Genes in region of difference (RD1) on MTB genome Culture filtrate protein 10 (CFP-10) Early secretory antigen target 6 (ESAT-6) TB7.7(p4) in QuantiFERON Gold In-Tube Identifies LTBI &/or disease Does not cross react with BGC vaccine or most other mycobacteria Requires: single medical visit [for LTBI, not for exposure] blood collection laboratory equipment and personnel o Results in hrs 15
16 Commercial Tests QuantiFERON-TB Gold Company: Cellestis, Australia US FDA approved for adults but not for children In-Tube improvement o Method: Whole blood Incubated with MTB antigens (ESAT-6, CFP TB7.7 7 {p4}) 6, CFP-10, T-Cells produce INF- Supernatant removed INF- measured by ELISA reader T-Spot. Spot.TB or ELISPOT Company: Oxford Immunotec, UK USFDA approved for adults but not for children o Method: T-cells Incubated with MTB antigens (ESAT-6 & CFP-10) T-Cells produce INF- IFN- binds to antibody in wells Spots develop and are counted manually or by reader Comparison of Tuberculin Skin Test and Interferon- ٢ Release Assays Tuberculin Skin Test IFN- ٢ Release Assay Antigens studied Cross-reactivity reactivity with BCG Cross-reactivity reactivity with NTM Estimated sensitivity, TB in immunocompetent adults Estimated specificity, TB in immunocompetent adults Distinguish between TB infection and TB disease Boosting Patient visits required Many -PPD Yes Yes ESAT-6, CFP-10 Unlikely Less Likely 75-90% 75-95% 70-95% % No Yes Two No No One 16
17 Sensitivity and Specificity QuantiFERON-TB Gold Sensitivity* (95%CI) Mori ( 04) 89 (82-94) Ravn ( 05) 85 (72-94) Kang ( 05) 80 (67-90) Pai ( 05) 75 (64-85) Specificity+ (95%CI) Mori ( 04) 98 (95-99) 99) Ravn ( 05) 97 (87-100) Kang ( 05) 96 (90-99) 99) Goletti ( 05) 90 (68-99) T-Spot. Spot.TB or ELISPOT Sensitivity* (95%CI) Lalvni ( 01a) 96 (85-99) Lalvni ( 01b) 80 (66-90) Pathan ( 01) 92 (74-99) Chapman ( 02) 92 (81-98) Liebeschuetz( 04) 83 (75-89) Meier ( 05) 97 (90-100) Specificity+ (95%CI) Lalvni ( 01a) 91 (80-98) Pathan ( 01) 100(89-100) 100) Meier ( 05) 92 (62-100) *Sensitivity in pts with active TB, Cx = Gold standard +Specificity in healthy low risk patients without TB Pai, Expert Rev Mol Diagn. 6(3): (2006) T-CELL ASSAYS FOR TUBERCULOSIS IN CHILDREN More data available for elispot technique Appear to be more specific for tuberculosis infection, especially in low prevalence conditions Correlate better with degree of exposure in contact investigations than does the TST: likely many false-positive TSTs in BCG- vaccinated children Dynamics of tests are largely unknown Results have been highly variable, and indeterminate results are common with QuantiFERON-TB Gold 17
18 INTERFERON-GAMMA RELEASE ASSAYS CDC expert panel recommends: 1. No preference for one test over the other 2. Should replace the TST for most adults and older children, except, perhaps, for immune compromised; less clear for children < 5 years of age 3. Can be used in contact investigations [even in contact investigations, many adults with a positive TST and history of BCG likely do not have LTBI] IGRAs IN CHILDREN SOME UNANSWERED QUESTIONS Should +TST in a BCG-vaccinated child always be followed by an IGRA? Should only IGRAs be used in a previously BCG- vaccinated child? Low risk child, TST > 15 mm, IGRA neg. Treat or no treat? High risk child [contact], TST > 10 mm, IGRA neg. Treat or no treat? Are IGRAs sufficiently sensitive for contact investigation of young children? Should we use IGRA for TB exposure in children [means two blood draws]? 18
19 IGRAs AND THE 2009 AAP RED BOOK Can use IGRAs in immunocompetent children > 4 years of age in all situations ti when a TST would be used Particularly useful/preferred for children who have received a BCG vaccination Usewithcautioninchildren<5yearsof in children of age, immunocompromised children Neither IGRAs nor the TST are perfect; always need clinical judgment! TRANSITIONS IN TUBERCULOSIS Susceptible Exposed Infected *Diseased Sick Diagnosed Treated Cured 19
20 HOW IS TUBERCULOSIS DIAGNOSED? Adults Mycobacterial-based based diagnosis positive sputum AFB smear - 60% - 75% positive sputum culture - 90% positive tuberculin skin test - 80% [HIV < 50%] Children positive sputum or gastric AFB smear - 10% positive sputum or gastric culture - 10% - 40% positive tuberculin skin test - 50% - 80% 20
21 DIAGNOSIS OF TUBERCULOSIS Even in developed countries, the gold standard d for the diagnosis i of tuberculosis in children is the triad of: 1. a positive TST 2. an abnormal CXR and/or physical exam 3. a history of recent contact to an infectious adult case of TB OBTAINING CULTURE AND AFB SMEAR SAMPLES FROM CHILDREN Traditional method is gastric aspiration, performed as an inpatient t on 3 consecutive mornings expensive, invasive Bronchioalveolar lavage has no advantage Nasopharyngeal aspiration few studies Other sites yields usually 0% - 25% culture positive, <10% smear positive 21
22 INDUCED SPUTUM COLLECTION IN CHILDREN Zar et al. Lancet 2005; 365: 130. Can be done inpatient or outpatient Infection control precautions important Salbutamol, followed by 15 minutes of 5% hypertonic saline solution Sputum obtained via suction with a nasopharyngeal catheter Yield: 30% to 40% culture positive INTERPRETING CHILDREN S CHEST RADIOGRAPHS FOR TB Rarely available in highest prevalence areas Marked inter- and intra- observer variability Reliable in expert hands and in the presence of suspicious symptoms Commonest picture is persistent opacification together with enlarged hilar or subcarinal lymph nodes [though nodes not always discernable] The x-ray is usually sicker than the patient! 22
23 CHEST RADIOGRAPH TECHNIQUE FOR CHILDREN Check for three important features 1. Rotation can make mediastinum be wider 2. Inspiration when inadequate, can cause mass effect of mediastinum, hilum 3. Penetration difficult to interpret if x-ray is too white or too black 23
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26 CT SCANS AND PULMONARY TB Can be valuable when it is not certain that an abnormality on CXR is due to TB define the anatomy Not valuable when CXR is normal! Example: Child with a 20 mm TST after a known exposure has a normal CXR. A CT scan shows two 1 cm nodes in the right hilum. How do you interpret? My answer: So what? INH will take care of this very nicely, and decision rules are based on CXR, not CT scan. 26
27 TUBERCULOSIS IN HIV-INFECTED INFECTED CHILDREN Clinical and Radiographic Presentation in children with preserved immunocompetence, presentation is indistinguishable from HIV- uninfected children most common symptoms remain malnutrition, fever, night sweats, lymphadenopathy and cough extrapulmonary disease (meningitis and tuberculoma, abdominal) is more common chest radiograph findings are typical, but more extensive and a broader differential diagnosis 27
28 TREATMENT OF LTBI IN CHILDREN 9 months of isoniazid (daily or twice weekly under DOT) is only accepted regimen INH-resistance or intolerance rifampin for 6 months Multidrug-resistance resistance consult an expert Use isoniazid unless there is documented exposure to a specific case of drug-resistant resistant TB PEARLS OF WISDOM FOR TREATING LTBI IN CHILDREN Use INH suspension only in children 5 kg Compliance with 9 months of INH averages 50% - be vigilant and skeptical Use DOPT for: recent contacts, infants, immune compromised When children aren t tolerating INH, the problem is more often with the parent than the child Route LFTs only for: other liver toxic drugs, liver disease, signs or symptoms of hepatitis 28
29 TREATING EXPOSED CHILDREN Very high rate of infection Takes up to 3 months for the skin test to turn positive U.S. studies 10% to 20% of childhood TB cases can be prevented if children exposed in a household receive isoniazid WHO standards children <5 years old in a TB household should be treated DIRECTLY OBSERVED THERAPY FOR TUBERCULOSIS means a dispassionate 3rd party is actually present when medications are taken with every dose standard of care in U.S. for treating tuberculosis disease desirable for high risk infections - newborns and infants, household contacts, HIV - infected or immune compromised 29
30 Pulmonary TREATMENT OF TUBERCULOSIS DISEASE IN CHILDREN INH, RIF for 6 months + PZA for first 2 months Add EMB initially if risk of INH resistance Can be every day or twice/thrice weekly therapy INH-resistant: RIF+PZA+EMB for 6 to 9 months MDR - depends on susceptibility - at least 18 months CNS, Disseminated usually start with 4 drugs (INH, RIF, PZA + ETH or STM) usual length: 9-12 months Every day initially, may use twice/thrice weekly later FOLLOW-UP EVALUATIONS FOR CHILDREN WITH TUBERCULOSIS skin test stays positive forever frequent chest x-rays unnecessary - at diagnosis, 1-2 months, end of therapy follow growth & development closely adequate nutrition routine liver enzyme monitoring not necessary routine vitamin B 6 not necessary except breast- feeding, pregnant adolescents, poor diet 30
31 WHAT WE REALLY NEED FOR BETTER TB CONTROL IN CHILDREN? A better vaccine Better diagnostic tests New drugs with pediatric pharmacokinetics Shorter durations of therapy Sustained public health funding for contact t investigation and DOT 31
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