1982-1985 Παιδιατρική Παν Νοσοκομείου Αλεξανδρούπολης

1986 - 88 Visiting Fellow, Office of the Scientific Director, Section on Viruses and Cellular Biology, Institute of Child Health and Human Development, NIH

1988 - 89 Visiting Fellow, Infectious Diseases Section, Pediatric Branch, NCI, NIH

1989 - 1991 - 93 Visiting Scientist, Infectious Diseases Section, Pediatric Branch, NCI, NIH