A community based study on haemoglobinopathies and G6PD deficiency among particularly vulnerable tribal groups in hard-to-reach malaria endemic areas of Odisha, India: implications on malaria control.

BACKGROUND: Haemoglobinopathies and G6PD deficiency are inherited disorders found mostly in malaria-endemic areas among different tribal groups of India. However, epidemiological data specific to Particularly Vulnerable Tribal Groups (PVTGs), important for planning and implementing malaria programmes, is limited. Therefore, the present community-based study aimed to assess the prevalence of haemoglobinopathies and G6PD deficiency among the 13 PVTGs found in the state of Odisha, reporting the maximum malaria cases in the country. METHODS: This cross-sectional study was conducted from July 2018 to February 2019 in 12 districts, home to all 13 PVTGs, in an estimated sample size of 1461, selected two-stage sampling method. Detection of haemoglobinopathies was done by the variant analyser. Screening of G6PD deficiency was carried out using DPIP method followed by quantification using spectrophotometry. The PCR-RFLP technology was used to determine variant of G6PD deficiency and haplotype analysis of sickle cell, while ARMS-PCR and GAP-PCR was used for detecting the mutation pattern in ß-thalassaemia and α-thalassaemia respectively. The diagnosis of malaria was done by Pf-PAN RDT as point of care, followed by nPCR for confirmation and Plasmodium species identification. RESULTS: The prevalence of sickle cell heterozygotes (AS) was 3.4%, sickle cell homozygous (SS) 0.1%, ß-thalassaemia heterozygotes 0.3%, HbS/ß-thalassaemia compound heterozygote 0.07%, HbS-α-thalassaemia 2.1%, G6PD deficiency 3.2% and malaria 8.1%. Molecular characterization of ßS revealed the presence of Arab-Indian haplotype in all HbS cases and IVS 1-5 G → C mutation in all ß-thalassaemia cases. In case of α-thal, αα/α-3.7 gene deletion was most frequent (38%), followed by αα/α-4.2 (18%) and α-3.7/α-3.7 (4%). The frequency of G6PD Orissa (131C → G) mutation was found to be 97.9% and G6PD Mediterranean (563C → T) 2.1%. Around 57.4% of G6PD deficient individuals and 16% of the AS were found to be malaria positive. CONCLUSION: The present study reveals wide spread prevalence of sickle cell anaemia, α-thalassaemia, G6PD deficiency and malaria in the studied population. Moderate to high prevalence of G6PD deficiency and malaria warrants G6PD testing before treating with primaquine (PQ) for radical cure of Plasmodium vivax. Screening and counselling for HbS is required for the PVTGs of Odisha.

Health status of Koraga community: A pilot study among a particularly vulnerable tribal group of Udupi District, Karnataka, India.

Background & objectives: Undertaking tribe-specific assessment of health status provides the required data for planning appropriate interventions. Hence, a study was conducted to assess the health profile of the Koraga tribe. Methods: This community-based cross-sectional study was conducted among a particularly vulnerable tribal group, the Koragas residing in the Udupi district. Data were collected using a pro forma and were analyzed using the SPSS software version 16.0. Results: A total of 273 participants aged ≥18 yr and 94 children aged ≤17 yr were recruited through screening and referral services organized in Koraga hamlets of the Udupi district. Among the adults, 59.7 per cent were females and their median age was 35 yr. About 13.9 per cent had elevated blood pressure and 18.4 per cent had impaired/elevated random blood sugar levels. About 47.6 per cent were underweight and 35.2 per cent were anaemic. Multivariate logistic regression analysis showed that individuals with morbidities were more likely to be aged ≥45 yr [45-60 yr: adjusted odds ratio (AOR)=4.3; 95 per cent confidence interval (CI)=1.3-13.8 and >60 yr: AOR=6.4; 95 per cent CI=1.7-23.7] and overweight or obese [23-24.9 kg/m[2]: AOR=8.1; 95% CI=1.3-48.2 and >25 kg/m[2]: AOR=7.9; 95% CI=1.6-38.4]. Of the 26 Koraga children aged ≤5 yr, 30.7 and 42.3 per cent had their height for age and weight for age below the third percentile, respectively. Further, 15.3 per cent of under-five children and 27.9 per cent of 6-17 yr old children were severely wasted. About 21.2 per cent of the children aged ≤17 yr were found to be anaemic and 56.3 per cent had symptoms of respiratory tract infection in the past 15 days. Interpretation & conclusions: Malnutrition was prevalent among Koraga adults and children, which warrants designing and implementing appropriate social and health interventions in this population.

Declining tuberculosis prevalence in Saharia, a particularly vulnerable tribal community in Central India: evidences for action.

BACKGROUND: In spite of an alarmingly high tuberculosis (TB) burden amongst the Saharia tribe of central India, there is hardly any study to investigate the impact of DOTS implementation on the magnitude of tuberculosis disease and the changes over time. This article present the findings of TB prevalence surveys conducted amongst this indigenous population in two different time periods to know the change in the prevalence of TB. METHODS: A cross sectional survey was conducted among Saharia population in Shivpuri district, Madhya Pradesh during February 2013 to May 2013 and resurvey during March 2015 to July 2015. All individuals (≥15 years) were examined for chest symptoms suggestive of TB. Sputum samples were collected from all presumptive TB cases and were confirmed by laboratory examination by Ziehl-Neelsen smear microscopy and solid media culture methods. All detected cases were referred to health facility for anti-tuberculosis treatment as per RNTCP guidelines. RESULTS: There was significant reduction (trend Chi square 19.97; OR = 1.521; p = 0.000) in the prevalence of TB at the endline (1995 per 100,000) as compared to baseline (3003 per 100,000). The reduction was significant among males as compared to females (OR 1.55; p = 0.000) and in the age group of 25-34 years (OR 2.0; p = 0.007) and 45-54 years (OR 4.39; p = 0.003). There was significant reduction in the prevalence in both smear (OR 1.29; p = 0.02) and culture positive (OR 1.57; p = 0.000) TB at the endline survey. CONCLUSION: The study findings highlight a reduction in the prevalence of TB among Saharia tribal population. Further studies are needed to identify the factors associated with reduction in prevalence among this population and also further surveys to monitor the prevalence trend over a period.