The masters think a slave who chooses to work during his time off doesn't deserve the time off, and a slave who doesn't work to save enough throughout the year to buy whiskey for the holidays is considered lazy.
An adjuvant is a substance added to some vaccines to enhance the immune response of vaccinated individuals. The aluminum salts in some U.S. licensed vaccines are aluminum hydroxide, aluminum phosphate, alum (potassium aluminum sulfate), or mixed aluminum salts.
1 A vaccine is a product that produces immunity from a disease and can be administered through needle injections, by mouth, or by aerosol.  A vaccination is the injection of a killed or weakened organism that produces immunity in the body against that organism.