A/ Vietnam/ 1203/ 2004- vaccinen gav beskyttelse ved homolog eksponering, hvilket manifesterede sig ved fuld overlevelse, reduceret vægttab, en mindre udtalt og mere kortvarig temperaturforøgelse, en mindre markant reduktion af lymfocyttallet samt reduktion af inflammation og nekrose i hjerne og bulbus olfactorius hos den vaccinerede kohorte end hos kontroldyrene.
The A/ Vietnam/ 1203/ 2004 vaccine afforded protection against homologous challenge as evidenced by full survivorship, reduced weight loss, a less pronounced and shorter increase in temperature, a less marked reduction in lymphocyte counts and in reduction of inflammation and necrosis in brain and olfactory bulb in the vaccinated cohorts as compared to control animals.