Tuberculosis (TB) care and control does not end with an accurate and confirmed diagnosis, but that is a good start point. It needs to be followed with initiating standard and effective anti-TB treatment (without delay), supporting the person with TB to adhere to the treatment regimen and get cured. Dr Madhukar Pai, Associate Director of McGill International TB Centre, addressed private TB-healthcare providers including physicians and laboratory experts in New Delhi before the World TB Day 2014.
Dr Pai stressed: "Good diagnosis alone is not enough. TB treatment and completion is as important as diagnosis. TB control needs a complete solution. Diagnosis, treatment, adherence, notification, completion, cure."
Dr RS Gupta, Deputy Director General, Central TB Division, Ministry of Health and Family Welfare, Government of India, said while opening this continuing medical education (CME): "Indian public sector had notified 1.9 million TB patients last year but we are still missing one-third of people who need TB-care services. We need to accurately diagnose these 'missing' one-third patients too, provide them standard anti-TB treatment and ensure these get cured."
TB NOTIFICATION FROM PRIVATE SECTOR REMAINS LOW
Indian government had made TB a notifiable disease in May 2012. Public-healthcare sector was already notifying TB cases to the Revised National TB Control Programme (RNTCP) but since May 2012 even private-healthcare sector is also supposed to notify every TB case. However the uptake of TB notification has been far from satisfactory. "There are over 50,000 registered private hospitals but only 40,000 or so TB-case notifications came in from the private sector since May 2012," said Dr RS Gupta.
DIAGNOSING TB EARLY, ACCURATELY
But are we diagnosing people with presumptive TB early enough? Data suggests otherwise. "An average TB patient is diagnosed with TB after a delay of 2 months and has consulted till then at least 3 physicians or healthcare providers before getting diagnosis," said Dr Pai. Nearly 50% TB patients seek healthcare in private sector so role of private sector in TB care and control cannot be ignored.
If we really want to control TB and achieve the formidable targets of 'zero new TB infection' we have to ensure that every TB patient gets diagnosed accurately and is provided standard treatment without delay -- regardless of whether the patient is seeking care in private or public sector. It is vital that every physician or any other healthcare provider, whether in public- or private-healthcare sector, is following the Standards of TB Care in India (STCI, 2014) released on World TB Day, which are on the lines of the latest edition of the International Standards for TB Care (ISTC, 2014).
INNOVATION IN ADDRESSING SUBOPTIMAL TB DIAGNOSIS
"Accurate diagnosis is absolutely essential to drug-resistant TB," said Dr Pai, who is part of the path-breaking innovative initiative called IPAQT (Initiative for Promoting Affordable and Quality TB Tests).
It is important to underline that these WHO-approved latest TB diagnostic tests are available free of cost in public-sector laboratories across the country. The challenge was to make these WHO-approved TB diagnostic tests available in accredited private laboratories as well, at an affordable price.
What made IPAQT a good practice example is that it helped WHO-approved diagnostic manufacturers and accredited private laboratories in India to come to an agreement that was important to address the issue of suboptimal diagnosis of TB in private sector. Diagnostic manufacturers agreed to provide WHO-recommended TB diagnostic equipment such as Gene Xpert, Line Probe Assays (LPAs), Liquid Culture or Fluoroscent Microscope, and requisite supplies to private accredited laboratories at public-sector pricing. Private accredited laboratories that are part of IPAQT network agreed to pass on the same financial benefit to the patient who is seeking test for TB and agreed at a maximum price they can charge for such tests (which was broadly half of market price). Private laboratories also agreed to notify TB cases they were testing to the RNTCP. "Diagnostic manufacturers benefited because their sale volumes went up as they had made their products more affordable. Laboratories benefited because they now had a replacement for [banned] serology that is affordable to the patients. Central TB Division benefited because of greater TB notification from private sector, awareness and effective partnerships with these private laboratories," said Dr Pai.
Maximum prices agreed by private laboratories that are part of IPAQT network were as follows: Gene Xpert INR 2000 (market price is INR 4000); HAIN LPA INR 1600 (market price is INR 3500); and MGIT Liquid Culture 900.
As a result of IPAQT, TB diagnosis using WHO-recommended diagnostic tests shot up in private sector. Number of TB cases getting diagnosed using Gene Xpert in private sector went up from 500 to 22,210 after roll out of IPAQT. Similarly as LPA was not available in private sector before roll-out of IPAQT, the number of cases diagnosed with TB using LPA till February 2014 was 13,278.
"Any private laboratory in India can join IPAQT provided they are accredited, agree to notify cases to RNTCP, and agree to be part of external quality-assurance programme. IPAQT has partnered with 64 laboratories in a year," said Dr Pai to Citizen News Service (CNS).
OPT FOR CORRECT TEST TO DIAGNOSE TB
Gene Xpert, LPAs, Liquid and Solid Cultures are some of the WHO-recommended standard tests for accurately diagnosing TB, and anti-TB drug resistance as well. Fluorescent microscope is another WHO-recommended test for TB. Dr Pai said that "LED-Fluorescent Microscope picked up 20% more TB cases than conventional microscope."
"If resources were not a problem then Gene Xpert is the top start test for TB. But resources are a problem so that is why we prioritize two groups for getting TB diagnosed using Gene Xpert: 1) those with presumptive multidrug-resistant TB (MDR-TB) and 2) those with HIV. Roll out of a Gene Xpert has crossed five million cartridges now. Gene Xpert picks up 88% of all culture-positive TB with has a specificity as high as 99%. It practically picks up every smear positive case and also picks up almost 70% of smear negative TB. If used for Drug Susceptibility Testing (DST is used to test anti-TB drug resistance) then it picks up 95% of rifampicin resistance with specificity of 98%. Recent publication by Central TB Division and Foundation for Innovative New Diagnostics (FIND) colleagues show that it is possible to use this technology even at a decentralized level. It has been put up in microscopy centres in 18 cities across India and gave 99% valid results with very low failure rates. Data also shows substantial increase in case detection of bacteriologically confirmed TB and increase in rifampicin resistance case detection," said Dr Pai.
For diagnosing presumptive extra-pulmonary TB (EPTB), appropriate samples from the suspected site of involvement should be obtained for microbiological and histological examination, as per the latest edition of ISTC.
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