  We study dilute gases with short range interactions and large two-body
scattering lengths. At temperatures between the condensation temperature and
the scale set by therange of the potential there is a high degree of
universality. The first two terms in the expansion of thermodynamic functions
in powers of the fugacity $z$, which measures the diluteness of the system, are
determined by the scattering length only. The term proportional to $z^3$
depends only on one new parameter describing the three-body physics. We compute
the third term of the expansion and show that, for many values of this new
parameter, the $z^3$ term may be the dominant one.
