UPDATE 1-Sanofi says flu vaccine effective after single dose

* Single dose effective in adults over 65

* Data from clinical trials on children due early October (Adds detail)

PARIS Oct 1 (Reuters) - French drugmaker Sanofi-Aventis (SASY.PA)said tests on adults confirmed that a single dose of its vaccine against H1N1 flu was effective even for people aged over 65.

Sanofi Pasteur, the group's vaccines division, began clinical trials on Aug. 6 in the United States to test the performance and safety of its so-called Influenza A (H1N1) 2009 Monovalent Vaccine.

Data so far "indicate that a single 15 mcg dose ... administered to adults, including the oldest study participants, induces a robust antibody response 21 days post-vaccination that is considered protective," Sanofi said in a statement on Thursday.

The study was carried out on 849 adults aged 18 and over. Interim data from clinical trials in children will be available in early October, Sanofi added.

The drugmaker said last week it expected its swine flu vaccine to boost revenue this year and next as it benefits from orders from governments to fight the virus. [ID:nLO170932]

Governments and manufacturers have been scrambling for vaccines to target the new H1N1 flu strain ahead of a feared second wave of infection as the northern hemisphere heads into winter. Swine flu was declared a pandemic in June. (Reporting by James Regan; Editing by David Holmes)