SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                                    --------
                                    FORM 6-K

                        REPORT OF FOREIGN PRIVATE ISSUER
                      PURSUANT TO RULE 13A-16 OR 15D-16 OF
                       THE SECURITIES EXCHANGE ACT OF 1934

                          For the month of March, 2004

                                  Serono S.A.
                      -----------------------------------
                              (Registrant's Name)

                            15 bis, Chemin des Mines
                                Case Postale 54
                                CH-1211 Geneva 20
                                  Switzerland
                      -----------------------------------
                    (Address of Principal Executive Offices)

                                    1-15096
                      -----------------------------------
                              (Commission File No.)

     (Indicate  by  check  mark whether the registrant files or will file annual
reports  under  cover  of  Form  20-F  or  Form  40-F.)

     Form  20-F  X  Form  40-F
               -----          -----

     (Indicate  by  check  mark  if the registrant is submitting the Form 6-K in
paper  as  permitted  by  Regulation  S-T  Rule  101  (b)(1).)
                                                              ------

     (Indicate  by  check  mark  if the registrant is submitting the Form 6-K in
paper  as  permitted  by  Regulation  S-T  Rule  101  (b)(7).)
                                                              ------

     (Indicate  by  check  mark  whether  the  registrant  by  furnishing  the
information contained in this form is also thereby furnishing the information to
the  Commission  pursuant to Rule 12g3-2(b) under the Securities Exchange Act of
1934.)

      Yes     No  X
         -----  -----

     (If  "Yes"  is  marked,  indicate  below  the  file  number assigned to the
registrant  in  connection  with  Rule  12g3-2(b):  82-      )
                                                       ------



                                                                [GRAPHIC OMITED]




MEDIA  RELEASE


FOR  IMMEDIATE  RELEASE
-----------------------


     SERONO'S SEROSTIM(R) IMPROVES LEAN BODY MASS AND PHYSICAL PERFORMANCE IN
                      PATIENTS WITH HIV-ASSOCIATED WASTING

         RESULTS OF LARGEST STUDY OF RECOMBINANT HUMAN GROWTH HORMONE IN
    HIV-ASSOCIATED WASTING PUBLISHED IN CURRENT ISSUE OF THE JOURNAL OF AIDS

ROCKLAND,  MA,  MARCH  31,  2004-SERONO  (VIRT-X:  SEO  AND  NYSE: SRA)-Serono's
Serostim(R) [somatropin (rDNA origin) for injection] improves lean body mass and
physical performance in patients with HIV-associated wasting, according to study
data  published  in  the current edition of the Journal of AIDS ("Growth Hormone
Improves  Lean  Body Mass, Physical Performance, and Quality of Life in Subjects
with  HIV-Associated  Weight  Loss  or  Wasting  on Highly Active Antiretroviral
Therapy").(1)

HIV-associated  wasting  is  a  chronically  debilitating  and  potentially
life-threatening  condition.  It is a metabolic disorder that causes the loss of
lean  body  mass,  which includes muscle tissue, important body organ tissue and
blood  cells,  and  can  lead  to  increased  risk  of opportunistic infections,
illness,  and  extreme fatigue and can profoundly diminish a person's quality of
life.

The present study, the largest randomized, double-blind placebo-controlled study
of  recombinant  human  growth  hormone in HIV-associated wasting, confirmed the
efficacy, safety and tolerability of Serostim(R). The study treated 757 patients
with HIV-associated wasting at US, European and other international trial sites.
Participants were treated with placebo, 0.1 mg/kg Serostim(R) on alternate days,
or  0.1mg/kg  of  Serostim(R)  on  a  daily  basis.

Over  the  12-week  course  of  therapy,  Serostim(R) was superior to placebo in
improving  physical  function, lean body mass and body weight and had a positive
effect  on  patient  perception  of  the  benefits  of  therapy.

"People  with  HIV  still  involuntarily  lose  both  weight and lean body mass,
despite  the adoption of highly antiretroviral therapy," said Joseph M. Gertner,
MD, Vice President of Medical Affairs, Metabolic Endocrinology, Serono, Inc. "As
demonstrated  by  these  study  results,  Serostim(R)  is the only therapy shown
clinically  to  build  body  mass  and  improve physical function in people with
HIV-associated  wasting."

-----------------------------
1  Moyle, G, Daar, E, Gertner JM, et al. Growth Hormone Improves Lean Body Mass,
Physical Performance, and Quality of Life in Subjects with HIV-Associated Weight
Loss  or  Wasting on Highly Active Antiretroviral Therapy. Journal of AIDS 2004,
Volume  35,  Number  4,  April  1  2004,  pp.  367  -  375.


                                                                             1/3

The  result  on  the  study's  primary  endpoint  of  cycle  work  output  was
statistically  significant  for the Serostim(R) as compared to the placebo group
(p<0.001).  Greater improvement was seen for the secondary endpoint of change in
lean  body  mass  for  the  Serostim(R)  daily  dose  group  as  compared to the
Serostim(R)  alternate  day group (p=0.017) and as compared to the placebo group
(p<0.001).  In  addition, patient perception of the impact of treatment on their
wasting  symptoms  was  positive with both doses of Serostim(R) (p=0.002 for the
alternate  day  group  and  p=0.0004  for  the  daily dose group) as compared to
placebo.  Bodily  pain  increased  in a dose dependent manner for both treatment
groups,  but  the  pain  did  not  interfere  with  the  subjects'  normal work.

This  study also provides long-term efficacy and safety information for up to 48
weeks  of  Serostim(R) treatment in a subset of participants. When treatment was
extended  from  12  to 24 or 48 weeks, positive results in cycle work output and
lean  body  mass  either  improved  further  or  were  maintained with continued
treatment  with  Serostim(R)  at  both  the  daily  and  alternate  day  dosing.

Adverse reactions reported during this clinical trial were consistent with those
included  in  the  current  product  labeling.

ABOUT  SEROSTIM
Serostim(R)  [somatropin (rDNA origin) for injection] is the only growth hormone
approved  by  the  US  Food  and  Drug  Administration  for  the  treatment  of
HIV-associated  wasting  or cachexia. The recommended dose is 0.1 mg/kg daily (6
mg/day  for  patients  > 55 kg). Serostim(R) 0.1 mg/kg every other day should be
considered  as  a  starting  dose  in  patients thought to be at risk of certain
adverse  effects,  i.e.,  glucose  intolerance.

In  patients  with  HIV-associated  wasting,  the  most  common  adverse  events
associated  with  Serostim(R) therapy are mild to moderate muscle and joint pain
and  swelling,  which  occur  in  a  dose-related  manner and often subside with
continued  treatment  or  dose  reduction.  Cases  of new onset impaired glucose
intolerance,  new onset Type 2 diabetes mellitus and exacerbation of preexisting
diabetes  mellitus  have  been  reported in patients receiving Serostim(R). Some
patients  develop  diabetic  ketacidosis  and  diabetic  coma. In some patients,
therapy  with Serostim(R) necessitated initiation or adjustment of anti-diabetic
treatment.  Patients  with  a history of hyperglycemia or other risk factors for
glucose  intolerance  should  be  monitored  closely  during  treatment  with
Serostim(R).  Transient increases in glucose levels occur early in treatment and
should  be  monitored.

Use  of  growth hormone is contraindicated in treatment of patients in intensive
care  units  due  to  complications  following  open-heart  surgery or abdominal
surgery,  multiple accidental trauma or acute respiratory failure; patients with
active  neoplasia;  and  patients with known hypersensitivity to growth hormone.
Serostim(R) must be used in conjunction with antiretroviral therapy.

Full  prescribing  information  for  Serostim(R),  including  important  safety
information,  is  available  at  www.serostim.com.
                                 ----------------


                                                                             2/3

ABOUT  SERONO
Serono,  Inc.,  located in Rockland, MA, is the US affiliate of Serono, a global
biotechnology  leader,  headquartered  in  Geneva,  Switzerland. The Company has
seven  recombinant  products,  Rebif(R)  (interferon  beta-1a),  Gonal-F(R)
(follitropin  alfa  for  injection),  Luveris(R)  (lutropin  alfa),
Ovidrel(R)/Ovitrelle(R)  (choriogonadotropin  alfa  injection),  Serostim(R)
[somatropin  (rDNA  origin)  for injection], Saizen(R) [somatropin (rDNA origin)
for  injection]  and  Zorbtive(TM)  [somatropin  (rDNA  origin)  for injection].
(Luveris(R)  is  not  approved  in  the  USA.)(2) In addition to being the world
leader  in reproductive health, Serono has strong market positions in neurology,
metabolism  and  growth.  The Company's research programs are focused on growing
these businesses and on establishing new therapeutic areas. Currently, there are
approximately  30  ongoing  development  projects.

In  2003,  Serono  achieved  worldwide revenues of US$2,018.6 million, and a net
income  of  US$390.0 million, making it the third largest biotech company in the
world. Its products are sold in over 90 countries. Bearer shares of Serono S.A.,
the  holding company, are traded on the virt-x (SEO) and its American Depositary
Shares  are  traded  on  the  New  York  Stock  Exchange  (SRA).


                                       ###

Some  of  the  statements  in  this  press  release  are  forward  looking. Such
statements  are inherently subject to known and unknown risks, uncertainties and
other  factors  that  may  cause  actual results, performance or achievements of
Serono  S.A.  and  affiliates  to be materially different from those expected or
anticipated  in  the  forward-looking statements. Forward-looking statements are
based on Serono's current expectations and assumptions, which may be affected by
a  number  of  factors, including those discussed in this press release and more
fully  described  in  Serono's  Annual  Report  on Form 20-F filed with the U.S.
Securities  and Exchange Commission on March 25, 2004. These factors include any
failure  or  delay  in  Serono's ability to develop new products, any failure to
receive  anticipated  regulatory  approvals,  any  problems  in  commercializing
current  products  as  a  result of competition or other factors, our ability to
obtain  reimbursement  coverage  for  our  products,  and government regulations
limiting  our  ability  to  sell  our  products. Serono has no responsibility to
update the forward-looking statements contained in this press release to reflect
events  or  circumstances  occurring  after  the  date  of  this  press release.


                                       ###


FOR MORE INFORMATION, PLEASE CONTACT:

SERONO, INC., ROCKLAND, MA
MEDIA  RELATIONS:                     INVESTOR RELATIONS:
Tel.  +1 781 681 2340                 Tel.  +1 781 681 2552
Fax:  +1 781 681 2935                 Fax:  +1 781 681 2912

SERONO IN GENEVA, SWITZERLAND:
MEDIA  RELATIONS:                     INVESTOR RELATIONS:
Tel:  +41-22-739 36 00                Tel:  +41-22-739 36 01
Fax:  +41-22-739 30 85                Fax:  +41-22-739 30 22
http://www.serono.com                 Reuters:  SEO.VX / SRA.N
---------------------                 Bloomberg:  SEO VX / SRA US


-----------------------------
2  Package  inserts  for  Serono's  US  marketed  products  are  available  at
www.seronousa.com  or  by  calling  1-888-275-7376.
-----------------


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                                   SIGNATURES

     Pursuant  to  the  requirements of the Securities Exchange Act of 1934, the
registrant  has  duly  caused  this  report  to  be  signed on its behalf by the
undersigned,  thereunto  duly  authorized.



                                   SERONO  S.A.
                                   a  Swiss  corporation
                                   (Registrant)



March  31,  2004                   By:     /s/  Allan  Shaw
                                           -------------------------------------
                                   Name:   Allan  Shaw
                                   Title:  Chief  Financial  Officer