Hovedundersøgelsen af Focetria omfattede 486 raske personer (en tredjedel over 60 år) og sammenlignede evnen af to forskellige doser af Focetria til at udløse produktion af antistoffer (den immunogene virkning).
The main study of Focetria included 486 healthy subjects (a third of whom were over the age of 60) and compared the ability of two doses of Focetria to trigger the production of antibodies (immunogenicity).