title: The most prevalent Mycobacterium tuberculosis superfamilies among Iranian and Afghan TB cases.
abstract: This survey identified the spoligopatterns of Mycobacterium tuberculosis strains with an international designation responsible for transmission and prevalence of TB (2000 to 2005) among native and immigrant populations of Tehran. The spacer oligonucleotides typing was performed on 1742 Mycobacterium tuberculosis strains isolated from verified cases of TB. Clinical and demographic data of patients were collected using traditional methods. A total of 133 distinct spoligopatterns was observed. 1679 clinical isolates were clustered in 70 clusters (52.5%) and 63 isolates were defined as orphans pattern (47.3%). Based on an international spoligotype database, the east African-Indian (EAI, 24%), central Asian (CAS, 20.8%), T clade (20.7%), Haarlem I (4.4%), Beijing (3.2%) and shared type 253 (3.1%) were the major identified M. tuberculosis superfamilies. Our results showed that the intra-community TB transmission was 13.7%, whereas the inter-community transmission was 39.3% for Afghanis and 20.3% for Iranians. The study highlighted the epidemic potential of specific genotypes (EAI, CAS, T clades) among tuberculosis cases in the Tehran territory. We also confirmed that the impact of transmission through immigration is low.
authors.affiliation: National Research Institute of Tuberculosis and Lung Disease (NRITLD), Darabad, Tehran, Iran.
authors.forename: Ali Akbar
authors.initials: AA
authors.lastname: Velayati
authors.forename: Parissa
authors.initials: P
authors.lastname: Farnia
authors.forename: Mehdi
authors.initials: M
authors.lastname: Mirsaeidi
authors.forename: Mohammad
authors.initials: M
authors.lastname: Reza Masjedi
mesh_terms: D000328:Adult; D000346:Afghanistan / Q000208:ethnology; D000995:Antitubercular Agents / Q000627:therapeutic use; D015373:Bacterial Typing Techniques / Q000379:methods; D016009:Chi-Square Distribution; D016000:Cluster Analysis; D004641:Emigration and Immigration; D005260:Female; D005838:Genotype; D006801:Humans; D007492:Iran / Q000453:epidemiology; D008297:Male; D008875:Middle Aged; D009169:Mycobacterium tuberculosis / Q000145:classification* / Q000187:drug effects / Q000235:genetics; D018088:Tuberculosis, Multidrug-Resistant / Q000453:epidemiology / Q000382:microbiology*; D014397:Tuberculosis, Pulmonary / Q000453:epidemiology / Q000382:microbiology*
chemical_list: D000995:Antitubercular Agents