Preliminary 15μm results obtained with ISOCAM are compared with deep K-band and H_2_O maser observations of a 0.244deg^2^ field in the galactic plane at I=+45^o^. A new maser source is found to be associated with the infrared source with the largest colour index, (m_K_-m_15μm_)>=10, most probably a young star in its earliest evolutionary phase. Other three objects with (m_K_-m_15μm_)>=9, probably young stars, are also found in the observed region.