Molecular studies on mycobacteria / Wessam Youssef Mohamed Ahmed ; Supervised Khaled Farouk Mohammed Elamry , Salah Eldin Abdelkarim Selim , Sherif Abdelmonam Omar

Thesis (Ph.D.) - Cairo University - Faculty of Veterinary Medicine - Department of Microbiology

Mycobacterium bovis is the major causative agent of bovine tuberculosis (BTB) and part of the Mycobacterium tuberculosis complex (MTBC). BTB has an impact on the national and international economy, affects the ecosystem via transmission to wildlife and is of public health concern due to its zoonotic potential. Although still present in some industrialized countries, BTB today mostly affects developing countries lacking the resources to apply expensive test and slaughter schemes. Tuberculosis (TB) remains a global health problem despite near eradication in some developed countries. This study was conducted from early winter of 2015 to spring of 2017 to compare between conventional and molecular techniques for detection of mycobacterium bovis (M. bovis) in Egypt. A total of 49 specimens were collected from four major abattoirs (Elbasateen-Elmonieb- Beni-Suef- Alfayoum) to be analyzed bacteriologically and biochemically for: isolation, identification and confirmation of M. bovis with molecular methods. Only 19 isolates were found to be positive slow-growers mycobacterium species by conventional cultivation method on solid medium (LJ medium and Stone brink) and identified biochemically to 17 M. bovis isolates and 2 isolates M. tuberculosis. Genotyping detection of Mycobacterium tuberculosis complex by amplification of ext-RD9 region by real-time PCR was carried out on positive cultures and directly on specimens. Out of 49 DNA templates extracted directly from specimens, 31 specimens were confirmed to be infected by Mycobacterium tuberculosis complex by amplification of ext-RD9 region by real-time PCR

Issued also as CD