ABSTRACT
An accurate urine test for diverse populations with active tuberculosis could be transformative for preventing TB deaths. Urinary liporabinomannan (LAM) testing has been previously restricted to HIV co-infected TB patients. In this study we evaluate urinary LAM in HIV negative, pediatric and adult, pulmonary and extrapulmonary tuberculosis patients. We measured 430 microbiologically confirmed pretreatment tuberculosis patients and controls from Peru, Guinea Bissau, Venezuela, Uganda and the United States using three monoclonal antibodies, MoAb1, CS35, and A194, which recognize distinct LAM epitopes, a one-sided immunoassay, and blinded cohorts. We evaluated sources of assay variability and comorbidities (HIV and diabetes). All antibodies successfully discriminated TB positive from TB negative patients. ROAUC from the average of three antibodies' responses was 0.90; 95% CI 0.87-0.93, 90% sensitivity, 73.5% specificity (80 pg/mL). MoAb1, recognizing the 5-methylthio-D-xylofuranose(MTX)-mannose(Man) cap epitope, performed the best, was less influenced by glycosuria and identified culture positive pediatric (N = 19) and extrapulmonary (N = 24) patients with high accuracy (ROAUC 0.87, 95% CI 0.77-0.98, 0.90 sensitivity 0.80 specificity at 80 pg/mL; ROAUC = 0.96, 95% CI 0.92-0.99, 96% sensitivity, 80% specificity at 82 pg/mL, respectively). The MoAb1 antibody, recognizing the MTX-Man cap epitope, is a novel analyte for active TB detection in pediatric and extrapulmonary disease.
Subject(s)
Lipopolysaccharides/analysis , Tuberculosis/diagnosis , Tuberculosis/immunology , Adult , Coinfection/urine , Epitopes/immunology , Female , Guinea-Bissau , HIV Infections/urine , Humans , Immunoassay/methods , Immunologic Tests/methods , Lipopolysaccharides/immunology , Lipopolysaccharides/urine , Male , Middle Aged , Mycobacterium tuberculosis/immunology , Peru , Point-of-Care Systems , Sensitivity and Specificity , Tuberculosis/classification , Tuberculosis, Pulmonary/microbiology , Uganda , United States , VenezuelaABSTRACT
Sickle cell disease (SCD) has become a paradigm of immigration hematology in Europe. Accurate up-to date information is needed to determine SCD prevalence, define real burden of disease and develop appropriate clinical networks of care, especially in regions lacking screening programs. We used two independent sources of data (Regional Register of Rare Disorders and Regional Register of Hospital Discharge Records) to determine extent of SCD and pattern of hospitalization of pediatric patients in the Veneto Region of NorthEast Italy. A steady increase of case notifications and hospitalizations has been observed in the past five years. Ninety-five percent of patients are immigrants with HbS/HbS SCD. Specialized regional registers can be used to define disease extent and guide targeted interventions in regions still lacking comprehensive care screening programs.