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L S Chauhan

Publications and source records attributed to L S Chauhan.

At least 19 recordsLinked to original sources
PubMed2006

Source of retreatment cases under the revised national TB control programme in Rajasthan, India, 2003.

BACKGROUND: Three years after state-wide DOTS coverage and achievement of global targets for detection and cure, the proportion of sputum-positive retreatment cases remained high in the north Indian state of Rajasthan. AIM: To determine source, accuracy of categorisation and treatment outcomes in Category II sputum-positive retreatment cases registered from January to March 2003 in five districts of Rajasthan. MATERIAL AND METHODS: Two hundred consecutive Category II sputum-positive retreatment cases were identified from the tuberculosis register and interviewed using a semi-structured questionnaire. RESULTS: Categorisation was correct in 195 (97.5%) of retreatment cases interviewed. Treatment after default (TAD) comprised 84.6% (165/195) of interviewees, with 13.3% (n = 26) relapses and 2.1% (n = 4) failure cases. Of the TAD cases, 84.8% (n = 140) had defaulted from previous treatment in the private sector. Only 6.1% (n = 10) had defaulted from Category II DOTS treatment. The most unfavourable treatment outcome seen amongst interviewees was default, as also described in the national data. CONCLUSION: TADs constituted the majority of interviewed retreatment cases (84.6%), and were overwhelmingly being generated by irregular treatment in the private sector. Further involvement of the private sector in the DOTS programme in Rajasthan is needed to stop the creation of further retreatment cases.

Adolescent↗
PubMed2005

Revised national TB control programme in India.

The Revised National TB Control Programme (RNTCP), an application in India of the Directly Observed Treatment, Short Course (DOTS) strategy to control TB is being implemented in the country since 1997. The goal of the RNTCP is to decrease mortality and morbidity due to TB and cut transmission of infection until TB ceases to be a major public health problem in India Since 1999, achievements of the RNTCP have largely determined the global DOTS progress. It has been cited as the fastest expansion in the history of DOTS and in terms of patients being treated, it is the largest programme in the world. More than 50-fold expansion in RNTCP coverage has occurred since 1998 thus making DOTS accessible to more than 83% of the country's population. Quality of services has been maintained during this rapid expansion. As a result, the proportion of sputum positive cases confirmed in the laboratory is on par with international standards. By September 2005, the programme has initiated more than 3.5 million patients on treatment, thus saving over 600,000 additional lives. In 2003, new sputum positive case detection rate of 69% was achieved against target of at least 70% and treatment success rate of 86% has been achieved above the target of 85% Aggressive steps are being taken to meet global TB control targets by covering the entire country with RNTCP by 2005. Despite these achievements, there are many challenges for the RNTCP. Implementing DOTS in a diverse and large country, maintaining the quality of services during rapid expansion phase, decentralization of programme management to the states and, widening the reach of the programme to reach all sections of the society are some of the major challenges.

Antitubercular Agents↗
PubMed2005

The impact of HIV/AIDS on the control of tuberculosis in India.

Epidemics of HIV/AIDS have increased the tuberculosis (TB) case-load by five or more times in East Africa and southern Africa. As HIV continues to spread, warnings have been issued of disastrous AIDS and TB epidemics in "new-wave" countries, including India, which accounts for 20% of all new TB cases arising in the world each year. Here we investigate whether, in the face of the HIV epidemic, India's Revised National TB Control Program (RNTCP) could halve TB prevalence and death rates in the period 1990-2015, as specified by the United Nations Millennium Development Goals. Using a mathematical model to capture the spatial and temporal variation in TB and HIV in India, we predict that, without the RNTCP, HIV would increase TB prevalence (by 1%), incidence (by 12%), and mortality rates (by 33%) between 1990 and 2015. With the RNTCP, however, we expect substantial reductions in prevalence (by 68%), incidence (by 41%), and mortality (by 39%) between 1990 and 2015. In India, 29% of adults but 72% of HIV-positive adults live in four large states in the south where, even with the RNTCP, mortality is expected to fall by only 15% between 1990 and 2015. Nationally, the RNTCP should be able to reverse the increases in TB burden due to HIV but, to ensure that TB mortality is reduced by 50% or more by 2015, HIV-infected TB patients should be provided with antiretroviral therapy in addition to the recommended treatment for TB.

AIDS-Related Opportunistic Infections↗
PubMed2005

Lot quality assurance sampling of sputum acid-fast bacillus smears for assessing sputum smear microscopy centers.

Assessment of 12 microscopy centers in a tuberculosis unit by blinded checking of eight sputum smears selected by using a lot quality assurance sampling (LQAS) method and by unblinded checking of all positive and five negative slides, among the slides examined in a month in a microscopy centre, revealed that the LQAS method can be implemented in the field to monitor the performance of acid-fast bacillus microscopy centers in national tuberculosis control programs.

Bacteriological Techniques↗
PubMed2005

Storage of heat-fixed unstained sputum AFB smears for panel testing in a tuberculosis unit in South India.

To evaluate the suitability for panel testing of heat-fixed unstained sputum AFB smears stored for up to 10 months, panels of slides were prepared at the national laboratory and stored under ambient conditions. Every month, three slides were utilised for panel testing in each of 12 microscopy centres; 70 smears were checked in a blinded fashion after 10 months. Reading errors occurred in 15/360 slides used in panel testing and in 4/70 slides used in blinded checking. The quality and grading of heat-fixed unstained smears were unaffected for up to 10 months and were found suitable for panel testing.

Bacteriological Techniques↗
PubMed2005

Application of lot sampling of sputum AFB smears for the assessment of microscopy centres.

SETTING: Designated microscopy centres (DMC) and additional microscopy centres (AMC) performing sputum acid-fast bacilli (AFB) microscopy, the District TB Centre (DTC) and a reference laboratory (RL). OBJECTIVES: To ascertain the feasibility of adopting lot sampling of AFB smears and to assess the performance of MCs employing Senior Tuberculosis Laboratory Supervisors (STLS) with no knowledge about the principles of quality assurance of AFB microscopy and RL-based laboratory technicians with training on quality assurance for blinded checking of AFB smears. METHODS: Slides from MCs were transported to the DTC and the RL; 20 smears per month per MC were selected systematically; 1547 slides from DMCs and 726 from AMCs were checked, respectively, by STLSs at the DTC and by RL laboratory technicians. Discrepancies were resolved by referee. RESULTS: The discrepancy between MC laboratory technicians and STLSs at the DTC was 4.7%, compared to 1% at the RL. The STLSs and RL-based laboratory technicians had 70 and 2 errors, respectively. CONCLUSIONS: Lot sampling of AFB smears is feasible under field conditions. Assessment of MCs was more valid with RL-based technicians trained in principles of quality assurance of sputum AFB microscopy than with STLSs with no such training and working in the field.

Bacteriological Techniques↗
PubMed2005

Annual risk of tuberculous infection in four defined zones of India: a comparative picture.

SETTING: Twenty-six selected districts in India. OBJECTIVES: To estimate the average annual risk of tuberculous infection (ARTI) in four defined zones in the country. STUDY DESIGN: A tuberculin survey was conducted in selected clusters of 26 districts in four defined zones of India. Children 1-9 years of age were subjected to tuberculin testing with ITU PPD RT23 with Tween 80, and the maximum transverse diameter of induration was measured 72 h later. Prevalence of infection was estimated using the cut-off point method (Method I) and the mirror-image technique (Method II) among children without bacille Calmette-Guérin scar. Results from individual zones have been reported earlier, and the results from all four zones are presented here as a consolidated summary. RESULTS: The ARTI computed from estimated prevalence was found to be lowest in the southern zone (Method I: 1.1%, Method II: 1.0%). It was higher in the eastern zone (1.3% by both methods) and highest in the western (Method I: 1.8%, Method II: 1.6%) and northern zones (1.9% by both methods). The proportion of infected children was found to be significantly higher in urban than in rural areas in all zones. CONCLUSION: The intensified tuberculosis control efforts need to be sustained for many years.

Child↗
PubMed2005

Improved tuberculosis case detection through public-private partnership and laboratory-based surveillance, Kannur District, Kerala, India, 2001-2002.

BACKGROUND: Efforts to intensify global tuberculosis (TB) control are limited by difficulties in coordinating with private doctors. More than half of Indian TB patients may initially consult a private provider, but many are neither diagnosed accurately nor treated effectively. We established and evaluated a public-private partnership based on surveillance of TB detected in private laboratories and use of standardised directly observed treatment regimens. METHODS: In one district, the governmental TB control programme offered training in microscopy to all large private sector laboratories, and educated private physicians on the importance of microscopy for TB diagnosis. We reviewed records from participating private laboratories and all publicly diagnosed patients. RESULTS: Of 2328 pulmonary TB patients registered from July 2001 to December 2002, 404 (17%) were detected in the private sector. The annual new AFB-positive case notification rate increased by 21%, from 27.8/100,000 in 2000 to 33.5/100,000 in 2002. Surveillance at private laboratories found an additional 260 nonregistered AFB-positive patients. CONCLUSIONS: This public-private partnership substantially increased TB case detection and established a sustainable framework for private sector involvement in TB control. In the setting of a strong public sector programme, the combination of active surveillance of private laboratories along with physician sensitisation is a promising approach to improve TB case detection.

Humans↗
PubMed2004

Status report on DOTS expansion and implementation during the 4th quarter 2003.

Performance of RNTCP involvement of medical colleges in implementing DOTS strategy, management of paediatric TB under RNTCP, TB/HIV co-ordination, external quality assurance, training of staff, strengthening of ICE, monitoring, supervision and collaboration with other sectors are briefly discussed with regard to DOTS expansion and implementation during the 4th quarter, 2003.

Antitubercular Agents↗
PubMed2003

Blinded rechecking of sputum smears for acid-fast bacilli to ensure the quality and usefulness of restaining smears to assess false-positive errors.

SETTING: Microscopy Centres, Velliyur Tuberculosis Unit, Tiruvallur District, Tamil Nadu, India. PROCEDURES: Twelve microscopy centre laboratory technicians examined 41978 direct sputum smears for acid-fast bacilli. Senior Tuberculosis Laboratory Supervisors (STLS) checked all positive smears (4696) and 10% of negative smears (4776) in an unblinded fashion as per Revised National Tuberculosis Control Programme (RNTCP) guidelines. Ten per cent of the positive and negative slides and another 10% of unchecked negative slides were selected systematically for blinded rereading at the Tuberculosis Research Centre (TRC); 422 slides were reread without and with restaining. RESULTS: Unblinded checking by STLS of the smears read by the laboratory technicians yielded 95 to 100% agreement. Blinded rereading at the TRC revealed that false-negative errors were greater among the laboratory technicians (2-7%) than the STLS (0-3%). Restaining and blinded rereading of slides reduced false-positive errors from 27% to 7%. CONCLUSIONS: Blinded rereading at the reference centre facilitates assessment of laboratory technicians and STLS. Restaining before rereading the smears was found to be useful for precise estimation of false-positive errors.

Coloring Agents↗
PubMed2003

HIV/TB in India: a public health challenge.

The impact of HIV/AIDS epidemic on the epidemiology of TB worldwide is being noted with growing concern. Patients with HIV are more susceptible to opportunistic diseases including TB. The risk of development of TB in HIV-infected patients in India is 6.9/100 person-years compared to a 10% lifetime risk of developing TB in an HIV negative individual with Mycobacterium tuberculosis. Treatment with DOTS significantly prolongs the life of HIV-infected persons with TB. The Government of India emphasised the need for strengthening collaboration between TB and AIDS control programmes for better management of HIV-infected patients with TB. Areas with higher prevalence of HIV infection have been prioritised the RNTCP coverage and most are already implementing the RNTCP. The basic purpose of HIV-TB programme co-ordination is to ensure optimal synergy between the two programmes for prevention and control of both the diseases.

Antitubercular Agents↗
PubMed2003

Status report of the Revised National Tuberculosis Control Programme: January 2003.

Tuberculosis (TB) remains a serious public health problem in spite of DOTS programme recommended by WHO. One person dies from TB in India every minute. Revised National TB Control Programme (RNTCP) is playing a major role in global DOTS expansion. DOTS coverage has expanded from 2% of the population in mid-1998 to 57% by the end of January, 2003. RNTCP has made a significant contribution to public health capacity. The programme has saved the people of India hundreds of millions of dollars. Monitoring the clinical course using smear microscopy and accurately reporting treatment outcomes is essential in well-functioning DOTS programme. RNTCP has invested heavily and made significant strides in maintaining and improving quality DOTS. State and district level programme reviews are a key component of the process. RNTCP has established guidelines for the involvement of the private sector and medical colleges. A member by ongoing technical activities will improve RNTCP's surveillance and monitoring systems. However a challenge lies with the programme and a collective effort is welcome.

Communicable Disease Control↗