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 September, 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-______)



                                                                          Serono



Media  Release



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


   SERONO RECEIVES MARKETING AUTHORISATION FROM THE EUROPEAN COMMISSION FOR NEW
                     BIOLOGICAL PSORIASIS PRODUCT RAPTIVA(R)


      Product launches to commence in the EU during fourth quarter of 2004

GENEVA,  SWITZERLAND  -  SEPTEMBER 23, 2004 - Serono (virt-x: SEO and NYSE: SRA)
announced today that it has received European Commission Marketing Authorisation
for  its  product  Raptiva(R)  (efalizumab)  for  people with moderate-to-severe
chronic plaque psoriasis for whom other systemic treatments or phototherapy have
been  inadequate  or  inappropriate.

Raptiva is the first new biological treatment for psoriasis to be authorised for
marketing  in  the  25  countries  of  the European Union (EU).  Serono plans to
launch  the  treatment  in  several  countries  including Germany and the United
Kingdom  before  the  end  of  the year and throughout the rest of the EU during
2005.

"The  approval  of  Raptiva  provides  an  effective therapy for those psoriasis
patients  in the EU whose needs are not met by current treatments," said Ernesto
Bertarelli,  Chief  Executive  Officer  of  Serono.  "With  other  approvals  in
Switzerland,  Argentina,  Mexico and Brazil, our new, fourth therapeutic area of
Dermatology  has  made  a  very  strong  start."

According  to  Prof.  Saurat,  Chairman  of  the  Dermatology  Department at the
University  Hospital  of  Geneva  and  President  of  EADV  (European Academy of
Dermatology  and  Venerology),  "a  new  era  is  opening  in  the  treatment of
psoriasis."

"Biological  treatments  such  as Raptiva give us new hope of providing patients
with improved therapies that will be easier to manage and will provide effective
and  safe,  long-term  control  of  their  condition,"  he  added.


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ABOUT  RAPTIVA(R)
Raptiva(R)  is  a  humanized  therapeutic  antibody  designed to selectively and
reversibly  block  the  activation, reactivation and trafficking of T-cells that
lead  to  the  development  of  psoriasis  symptoms.  Raptiva  is designed to be
administered once weekly via subcutaneous injection and can be self-administered
by  patients  at  home  after  training  by  a  healthcare  professional.
Raptiva  received EU approval for the 'Treatment of adult patients with moderate
to  severe chronic plaque psoriasis who have failed to respond to, or who have a
contraindication  to,  or  are  intolerant to other systemic therapies including
cyclosporine,  methotrexate  and  PUVA'.
Serono  has  already  launched  Raptiva(R)  in  Switzerland  and  Argentina, has
recently  received  approval  in Mexico and Brazil and a positive recommendation
for  approval  in  Australia.  Raptiva(R) has also been available since November
2003  in  the  U.S.,  where  it  is  marketed  by Genentech for the treatment of
moderate  to  severe chronic plaque psoriasis in adults aged 18 or older who are
candidates  for  systemic  therapy  or  phototherapy.
Serono  has  the  rights  to develop and market Raptiva worldwide outside of the
United  States  and  Japan.
Development and marketing rights in the United States remain with Genentech Inc.
(NYSE:DNA)  and  its  U.S.  partner  XOMA  (Nasdaq:  XOMA).
More  than  3,500  patients in the U.S. and Europe have been included in Raptiva
trials  to  date, creating the largest existing database of patients taking part
in  studies  with  a  biological  therapy for psoriasis, with about 200 of these
treated  continuously  for  more  than  2-and-a-half  years.
Adverse  events  observed  with Raptiva include headache, non-specific infection
(e.g.,  common colds), chills, pain, nausea, asthenia (weakness), and fever, all
of which diminished after the first 1-2 doses. Further, there was no evidence of
accumulation  or  cumulative  toxicity.  At 30-months, the occurrence of serious
adverse  events  was  infrequent  which  is  consistent  with data from previous
Raptiva  Phase  III  studies.

ABOUT  PSORIASIS
Psoriasis  is  a  T-cell  mediated  disease  which  occurs  when skin cells grow
abnormally,  resulting in thick, red, scaly, inflamed patches. Plaque psoriasis,
the most common form of the disease is characterized by inflamed patches of skin
("lesions")  topped with silvery white scales. Psoriasis can be limited to a few
spots  or  involve  extensive  areas of the body, appearing most commonly on the
scalp,  knees, elbows and trunk. Although it is highly visible, psoriasis is not
a  contagious  disease.  While  there  are a number of medications that may help
control  the  symptoms  of  psoriasis,  there  currently  is  no  known  cure.

BACKGROUND  MATERIAL
For  free  B-roll,  video and other content about Raptiva, psoriasis and Serono,
please  visit  the  Serono  Media  Center  www.thenewsmarket.com/Serono. You can
                                           ----------------------------
download  print-quality images and receive broadcast-standard video digitally or
by tape from this site. Registration and video is free to the media.

ABOUT  SERONO
Serono  is  a  global  biotechnology leader. The Company has eight biotechnology
products,  Rebif(R),  Gonal-F(R),  Luveris(R),  Ovidrel(R)/Ovitrelle(R),
Serostim(R),  Saizen(R), Zorbtive(TM) and Raptiva(R) (Luveris(R) is not approved
in  the  USA).  In  addition  to  being the world leader in reproductive health,
Serono  has  strong market positions in neurology, metabolism and growth and has
recently entered the psoriasis area. 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).

                                       ***


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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:

CORPORATE MEDIA RELATIONS:    CORPORATE 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
www.serono.com                Reuters: SEO.VX / SRA.N
--------------                Bloomberg: SEO VX / SRA US

                              INVESTOR RELATIONS, USA
                              Tel:  +1 781 681 2552
                              Fax:  +1 781 681 2912


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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)



September 23, 2004                          By:    /s/ Francois Naef
                                                   ---------------------------
                                            Name:  Francois Naef
                                            Title: Secretary