He became involved in research on immunity and pathogenesis of viral diseases in
humans during his fellowship in Infectious Diseases and has continued this research in collaboration with colleagues in the US and internationally in Thailand, Europe, and Latin America.
During the
Human Capital and Mobility Programme (HCM, 1992 - 1994) and the subsequent Training and Mobility of Researchers Programme (TMR, 1994 - 1998) of the European science budget, about 7000 individual Marie Curie Research
Fellowships were awarded from more than 20,000 applications.