SETTING: A rural district in Malawi. OBJECTIVE: To determine the effect of inaccurate recall on estimates of the proportion of tuberculosis (TB) cases attributable to contact with identifiable prior cases. DESIGN: Case-control study of laboratory-confirmed TB cases and community controls, comparing family, household and area contacts identified from a database of TB cases with those named at interview. Estimation of prior contact as a risk factor for TB and identified factors associated with being a named contact. RESULTS: Ninety-five per cent of named contacts were known TB cases. The proportion of total identified contacts who were named at interview was 75%, and was similar for cases and controls. Cases were twice as likely as controls to identify prior contacts. Adding database information did not affect odds ratios, but increased the proportion of TB cases attributable to prior contact. Smear-positive, male and human immunodeficiency virus (HIV) negative TB patients were more likely to be named by subsequent cases. Identifiable recent contact with known smear-positive cases accounted for 12.5% of the TB burden. CONCLUSIONS: Reporting of putative source contacts showed little evidence of recall bias and gave estimates of the relative risk of TB associated with identifiable contact. The lower likelihood of HIV-positive cases being named as contacts may reflect reduced infectiousness.
SETTING: A rural district in Malawi. OBJECTIVE: To determine the effect of inaccurate recall on estimates of the proportion of tuberculosis (TB) cases attributable to contact with identifiable prior cases. DESIGN: Case-control study of laboratory-confirmed TB cases and community controls, comparing family, household and area contacts identified from a database of TB cases with those named at interview. Estimation of prior contact as a risk factor for TB and identified factors associated with being a named contact. RESULTS: Ninety-five per cent of named contacts were known TB cases. The proportion of total identified contacts who were named at interview was 75%, and was similar for cases and controls. Cases were twice as likely as controls to identify prior contacts. Adding database information did not affect odds ratios, but increased the proportion of TB cases attributable to prior contact. Smear-positive, male and human immunodeficiency virus (HIV) negative TBpatients were more likely to be named by subsequent cases. Identifiable recent contact with known smear-positive cases accounted for 12.5% of the TB burden. CONCLUSIONS: Reporting of putative source contacts showed little evidence of recall bias and gave estimates of the relative risk of TB associated with identifiable contact. The lower likelihood of HIV-positive cases being named as contacts may reflect reduced infectiousness.
Authors: M A Espinal; E N Peréz; J Baéz; L Hénriquez; K Fernández; M Lopez; P Olivo; A L Reingold Journal: Lancet Date: 2000-01-22 Impact factor: 79.321
Authors: Henk van Deutekom; Susan P Hoijng; Petra E W de Haas; Miranda W Langendam; Alice Horsman; Dick van Soolingen; Roel A Coutinho Journal: Am J Respir Crit Care Med Date: 2003-12-18 Impact factor: 21.405
Authors: Suzanne Verver; Robin M Warren; Zahn Munch; Emilia Vynnycky; Paul D van Helden; Madalene Richardson; Gian D van der Spuy; Donald A Enarson; Martien W Borgdorff; Marcel A Behr; Nulda Beyers Journal: Int J Epidemiol Date: 2004-04 Impact factor: 7.196
Authors: Suzanne Verver; Robin M Warren; Zahn Munch; Madalene Richardson; Gian D van der Spuy; Martien W Borgdorff; Marcel A Behr; Nulda Beyers; Paul D van Helden Journal: Lancet Date: 2004-01-17 Impact factor: 79.321
Authors: Amelia C Crampin; Judith R Glynn; Bagrey M Ngwira; Frank D Mwaungulu; Jörg M Pönnighaus; David K Warndorff; Paul E Fine Journal: AIDS Date: 2003-08-15 Impact factor: 4.177
Authors: C Wallace; J Fitness; B Hennig; L Sichali; L Mwaungulu; J M Pönnighaus; D K Warndorff; D Clayton; P E M Fine; A V S Hill Journal: Genes Immun Date: 2004-05 Impact factor: 2.676
Authors: Amelia C Crampin; Judith R Glynn; Hamidou Traore; Malcolm D Yates; Lorren Mwaungulu; Michael Mwenebabu; Steven D Chaguluka; Sian Floyd; Francis Drobniewski; Paul E M Fine Journal: Emerg Infect Dis Date: 2006-05 Impact factor: 6.883
Authors: A Crampin; S Kasimba; N J Mwaungulu; R Dacombe; S Floyd; J R Glynn; P E M Fine Journal: Trop Med Int Health Date: 2011-03-29 Impact factor: 2.622
Authors: Yun-Gyoung Hur; Patricia Gorak-Stolinska; Anne Ben-Smith; Maeve K Lalor; Steven Chaguluka; Russell Dacombe; T Mark Doherty; Tom H Ottenhoff; Hazel M Dockrell; Amelia C Crampin Journal: PLoS One Date: 2013-11-18 Impact factor: 3.240
Authors: Themba Mzembe; Estelle Mclean; Palwasha Y Khan; Olivier Koole; Lifted Sichali; Venance Mwinuka; Michael Kayange; Peter Mzumara; Andrew Dimba; Amelia C Crampin; Judith R Glynn Journal: AIDS Date: 2018-10-23 Impact factor: 4.177
Authors: Peter J Dodd; Clare Looker; Ian D Plumb; Virginia Bond; Ab Schaap; Kwame Shanaube; Monde Muyoyeta; Emilia Vynnycky; Peter Godfrey-Faussett; Elizabeth L Corbett; Nulda Beyers; Helen Ayles; Richard G White Journal: Am J Epidemiol Date: 2015-12-08 Impact factor: 4.897