Abstract
A case series study is reported which included serologic results obtained in 195 persons recruited from personnel and trainees of the Pan American Zoonoses Center in Buenos Aires, Argentina, and workers from other institutions. The individuals were vaccinated with three doses of suckling mouse brain vaccine administered on alternate days, and some of them were given a booster dose 30 or 365 days after the primary immunization. The sizeable percentage of reactors with a high neutralizing antibody response in a short period of time, the small number of persons requiring a booster dose 30 days after the first vaccine dose, the rapid and intense secondary immune response and the absence of serious post-vaccinal reactions justify encouraging the use of this abbreviated prophylactic course of suckling mouse brain vaccine.