  We present a low-energy effective field theory describing the universality
class of the Pfaffian quantum Hall state. To arrive at this theory, we observe
that the edge theory of the Pfaffian state of bosons at $\nu=1$ is an $SU(2)_2$
Kac-Moody algebra. It follows that the corresponding bulk effective field
theory is an SU(2) Chern-Simons theory with coupling constant $k=2$. The
effective field theories for other Pfaffian states, such as the fermionic one
at $\nu=1/2$ are obtained by a flux-attachment procedure. We discuss the
non-Abelian statistics of quasiparticles in the context of this effective field
theory.
