• 22nd World Congress of Dermatology, Seoul, 2011.
  • 5th International Congress of Cardiovascular Disease; 2009 June 5-7; Kosice, Slovakia.
  • World Congress of Dermatology, Argentina 2007, 02 (abstract no. D 613 and 1115).
  • Experimental Biology 2000, California, USA 2000.
  • International Conference on Heart Health in Developing Countries, AIIMS, New Delhi, 2000.
  • V International Congress of Tropical Pediatrics, 1998, Jaipur ( 2 papers).
  • First World Congress on Leishmaniasis, Turkey 1997.
  • XIV International Congress for Tropical Medicine & Malaria, Nagasaki, Japan, 1996.
  • 6th International Congress for Infectious Diseases, Czech Republic, 1994.
  • International Congress of Dermatology 1994 AIIMS, New Delhi.
  • XVIII International Conference of Chemotherapy, Stockholm, Sweden 1993.
  • International Congress of Cardiology, Florida USA 1992.
  • World Congress of Dermatology, New York, USA 1992.
  • International Congress of Chemotherapy, Berlin, Germany 1991.
  • XXXII International Congress on History of Medicine, Antwerp, Brussels, Belgium 1990.
  • 2nd Asian Dermatological Congress 1989.
  • International Congress of Tropical Medicine, Amsterdam, Holland 1988.
  • World Congress of Dermatology. Berlin, West Germany, 1987.
  • VII International Congress of Protozoology Nairobi, Kenya, 1985.