Bain was appointed as a National Centre for Scientific Research (CNRS) research supervisor in the Heminth Zoology Laboratory and rose to the ranks of Director of Research (DR) of Exceptional Class. The lab researched parasitic nematodes, trematodes, cestodes and protozoa. Bain specialized in the systematics of filariae, and studying the biology of filariae which led to the characterization of the phyletic relationships between filarial lineages and those of non-filarial nematodes. She also contributed to the study of filarial
zoonoses. Bain investigated aspects of vector biology that related to filarial worm infection with the goal of finding a way to control transmission. Her work and research resulted in the establishment of experimental models of filariasis in rodents, which has advanced the study of filarial disease, chemotherapy and immunology. She published more than 360 articles during her 50-year career and had 30 years of successive contracts with the
World Health Organization (WHO), the
Edna McConnell Clark Foundation, and the
European Union. == Recognition ==