[Show abstract][Hide abstract] ABSTRACT: Background
Malaria endemicity in the archipelago of Indonesia varies substantially across regions. Following the government’s plan for a malaria elimination programme in Indonesia, baseline malaria surveys were conducted in Mamuju District, West Sulawesi Province, Indonesia to re-assess the malaria situation prior to the establishment of an evidence-based malaria elimination programme in the area. The present study aims to determine the antibody response to three merozoite antigens among the inhabitants of the district.
Antibodies were measured following elution from filter-paper blood spots collected during cross-sectional surveys in the dry and wet season in 2010. Enzyme-linked immunosorbent assays using three merozoite antigens, MSP2, EBA175 and PfRh2a were conducted. A positivity threshold was determined by samples from unexposed individuals and the difference in antibody level against each antigen and correlation of antibody level in different age groups and seasons were statistically analysed.
A total of 497 subjects, 248 in dry and 249 in wet season, aged between 0.6 and 78 years were included. The prevalence of positive antibody responses to MSP2, EBA175 and PfRh2a antigens in dry season were 27.82, 27.42 and 25.81%, respectively. In wet season, the antibody prevalences were 64.26, 64.66 and 61.45%. The antibody levels to the three antigens were all higher in older age groups and also significantly higher in the wet season. The antibody levels also correlated positively with the Plasmodium falciparum infection status of the subjects.
MSP2, EBA175 and PfRh2a induce antibody responses among the subjects in Mamuju District, and the prevalence is significantly higher in wet season. The level of antibody also correlates significantly with age and malaria positivity. The overall results indicate the antigens might be used as a target for vaccines against P. falciparum infection and as markers for malaria exposure.
[Show abstract][Hide abstract] ABSTRACT: Patients with suspected pulmonary tuberculosis (TB) visiting government TB diagnostic and treatment centres in Makassar City, South Sulawesi Province, Indonesia, from February to October 2008 were included in the study.
To determine the distribution of Mycobacterium tuberculosis genotypes in Makassar.
Cross-sectional study. Spoligotyping, mycobacterial interspersed repetitive units-variable number of tandem repeats (MIRU-VNTR) and principal genetic grouping (PGG) were used to genotype the M. tuberculosis clinical isolates.
Among 179 isolates derived from pulmonary TB patients, distribution of spoligotypes comprised the East Africa-Indian (30.2%), T (17.9%), H (12.3%) and Beijing (9.5%) lineages. Other lineages found in smaller proportions were the Latin American-Mediterranean, MANU, S and X lineages. Nineteen isolates (10.6%) could not be grouped into any of the reported lineages or shared types. Single nucleotide polymorphism analysis of katG(463) and gyrA(95) grouped these isolates primarily into PGG1 (9/19, 47%).
Only a few genetically identical clustered isolates were identified within the 9-month study period, and most isolates were genetically diverse. Furthermore, 15 spoligopatterns identified in our study have not been reported previously. To our knowledge, this is the first comprehensive study describing genotypes of M. tuberculosis clinical isolates in Sulawesi.
The International Journal of Tuberculosis and Lung Disease 11/2012; 16(11):1441-8. DOI:10.5588/ijtld.12.0055 · 2.76 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: Government tuberculosis (TB) diagnostic and treatment centres, Makassar, Indonesia.
To determine the proportions and patterns of resistance to commonly used TB drugs (isoniazid [INH], rifampicin, ethambutol and streptomycin) among pulmonary TB patients and assess potential risk factors for drug resistance.
Of 657 recruited patients, 234 were culture-positive. Drug susceptibility testing (DST) results were available for 216 patients. Among these, 197 were infected with Mycobacterium tuberculosis complex (145 new and 52 previously treated). Isolates from 89 new (61.4%) and 31 previously treated (59.6%) patients were susceptible to all four drugs. Resistance to INH was high among both patient groups (28.3% of new vs. 34.6% of previously treated). Multidrug-resistant TB (MDR-TB) cases accounted for respectively 4.1% and 19.2% of these patients. Resistance to >2 drugs was high among previously treated patients (19.2%). MDR-TB cases were more likely to have a history of excess alcohol use (adjusted OR 4.01, 95%CI 1.28-12.53) and previous TB treatment (adjusted OR 6.28, 95%CI 2.01-19.64).
Regardless of previous treatment history, many culture-positive TB patients were infected with INH-resistant isolates, and a significant proportion of previously treated patients were infected with MDR-TB. Treating culture-positive TB patients, especially previously treated patients, based on DST results should therefore be considered.
The International Journal of Tuberculosis and Lung Disease 04/2011; 15(4):489-95. DOI:10.5588/ijtld.09.0730 · 2.76 Impact Factor