In  the  data  taken  with ISOCAM-CVF around the exciting source of the Trifid
Nebula  (Proposals COM_GLO and TRIFID) we have found warm dust around the star
(see  Figure 1 and 2). Other stars in the Trifid also show the same behaviour.
This  result  is  very  important  for the study of massive star formation and
induced  star  formation.  It  means  that  the  central  object  of Trifid is
extremely  young  as it has not been able to dissipate all the material around
it. The star is of O7 V type and has ionized one important fraction of the gas
around  it.  However, a dust envelope has survived to the strong UV field. The
stellar  spectrum shows the silicate feature in emission. Around the star this
feature   is  detected  at  several  positions,  but  shifted  towards  longer
wavelengths. Probably the dust solid state features at different locations are
excited  under  different  physical  conditions.  The  dust continuum emission
increases  dramatically  around  the  star (the spectrum is different from the
stellar  one  what  means  that  there  is  not contamination from the central
object).
The  unprecedent  informations provided by the proposed observations, together
with  our on-going studies of the molecular content, and our detailed chemical
and  hydrodynamical  modelling,  will lead to a complete picture of the Trifid
Nebula  and  will  supply  a  full  description  of  the physical and chemical
properties of the interstellar dust.