To compare EI with needle injection through these conventional routes, we used a formalin-inactivated Aichi/68 influenza virus to immunize BALB/c mice (n = 8 per group). For EI, the vaccine was ...

In mice, the injection is made directly into the abdominal cavity for 25 weeks until euthanasia, the equivalent of administering it to a person for almost two decades. In humans, the injection is ...