I det ene forsøg blev 16 fritter opdelt i to kohorter og enten vaccineret på dag 0 og dag 21 med 7, 5 µg af A/ Vietnam/ 1203/ 2004- vaccinen eller vaccination blev imiteret.
In one study, sixteen ferrets were divided into two cohorts and were vaccinated on days 0 and 21 with 7.5 µg of the A/ Vietnam/ 1203/ 2004 vaccine or were sham vaccinated.