*The International Symposium on the Development of Animal Resources in the Sudan , Khartoum, Sudan (1988).

*The Fourth Congress of the European Society for Veterinary Pharmacology and Toxicology. Budapest, Hungary (1988).

*The 12th International Symposium of the world Association of Veterinary Microbiologists, Immunologists and Infectious Diseases Specialists.   California, USA.(1992).

*The 12th Annual Meeting of the American Society for Virology, California, USA.(1993).

*The Western Conference of Immunology, University of California, Berkeley. California, USA (1994).

*The Fourth International Symposium of Veterinary Immunology, California, USA.(1995).

* The 9^th Conference of Veterinary Medicine, Assiut University, Egypt (2000).

*The 11^th Conference of the Islamic Accademy of Science (IAS), Rababt , Moroco   (2001).

*The 9^th Conference of the Jordanian Veterinary Medical Association, Amman, Jordan (2001).

*The 27th World Veterinary Association, Chartage, Tunisia (2002).

* The 9^th Conference of Veterinary Medicine, Cairo University, Egypt (2003).

*The 2^nd Round Table Meeting on Foot and Mouth Disease (FMD), Food and Agricultural Organization (FAO), Cairo, Egypt (2003).

* National Conference of Parasitology, Stuttgrdt, Germany (2004).

* The 21^st Internationa conference of Hydatidology, Nirobi, Kenya (2004).

* The 21^st Internationa congress of World Association of Cardio-thoracic Surgery, Attawa, Canada (2006).

* The 23^rd Internationa conferece of Hydatidology, Athens, Greece. (2007).

* The 22 ^nd Internationa congress of World Association of Cardio-thoracic Surgery, Kyoto, Japan(2007).

 * Second Working group, The European Commission on Animal wellfare, Parma, Italy (2009).