The popular name undulant fever originates from the characteristic undulance (or wave-like nature) of the fever, which rises and falls over weeks in untreated patients.
At the time, the disease was frequently called undulant fever, so named because body temperatures rose and fell in "undulating" waves, accompanied by intense sweating and joint pains.
Bits of dissonance, piercing overtones and gently jarring electronic sound spike the undulant harmonies, but so subtly that the overall aural impression is of beguiling consonance....
However, since most humans got undulant fever by consuming unpasteurized milk, with the advent of wide-spread pasteurization, the human health threat has largely been dissipated.