an Entity references as follows:
Salvioli's diffusing vaccine (known by its Italian initials VDS, for vaccino diffondente Salvioli) was an Italian vaccine against tuberculosis used from 1948 until 1976, formulated by professor Gaetano Salvioli (1894–1982) of the University of Bologna. The VDS was for some decades the Italian competitor of the French BCG vaccine against tuberculosis.