Use of an oil-in-water emulsion (A) as an adjuvant for vaccines, by contralateral application, where (A) comprises about 5% squalene, 0.5% Polysorbate 80 and 0.5% sorbitan trioleate in aqueous citrate buffer at pH 6.5, is new. - ACTIVITY : Antiviral antibacterial antiparasitic. No details of tests are given. - MECHANISM OF ACTION : Vaccine.