  We have obtained high resolution (R = 10,000) K-band spectra of candidate
young massive stars deeply embedded in high-mass star-forming regions. These
objects were selected from a near-infrared survey of 44 regions of high-mass
star-formation (Kaper et al, 2006). In these clusters, 38 OB stars are
identified whose K-band spectra are dominated by photospheric emission. In
almost all those stars, the K-band spectra are indistinguishable from field
stars. However, in some stars the profile of the Bracket gamma line is
different (less deep, or absent) from those of the O field stars. One of the
explanations of these profiles might be an enhanced mass-loss.
