Haffkine Haff·kine (hāf'kĭn), Waldemar Mordecai Wolfe. 1860-1930.
Russian bacteriologist known for his work in India on inoculations against cholera and plague.
Professor haffkine's preventive inoculation against the plague is still being largely employed in India.
I do not know how old the haffkine's Fluid is; and the older it is, the longer it takes to render one immune.
And the method of vaccination which Doctor haffkine believes he has discovered?