  Results are reported from a search for active to sterile neutrino
oscillations in the MINOS long-baseline experiment, based on the observation of
neutral-current neutrino interactions, from an exposure to the NuMI neutrino
beam of $7.07\times10^{20}$ protons on target. A total of 802 neutral-current
event candidates is observed in the Far Detector, compared to an expected
number of $754\pm28\rm{(stat.)}\pm{37}\rm{(syst.)}$ for oscillations among
three active flavors. The fraction $f_s$ of disappearing \numu that may
transition to $\nu_s$ is found to be less than 22% at the 90% C.L.
