  We present the results of the combination of searches for the standard model
Higgs boson produced in association with a W or Z boson and decaying into b
bbar using the data sample collected with the D0 detector in p pbar collisions
at sqrt{s}=1.96 TeV at the Fermilab Tevatron Collider. We derive 95% CL upper
limits on the Higgs boson cross section relative to the standard model
prediction in the mass range 100 GeV <= M_H <= 150 GeV, and we exclude Higgs
bosons with masses smaller than 102 GeV at the 95% CL. In the mass range 120
GeV <= M_H <= 145 GeV the data exhibit an excess above the background
prediction with a global significance of 1.5 standard deviations, consistent
with the expectation in the presence of a standard model Higgs boson.
