[Influenza vaccination: recommendations and remarks].

Several types of influenza vaccine have been developed in the world. Split vaccine has been used as seasonal influenza vaccine and 2009 pandemic monovalent vaccine in Japan. Seasonal influenza vaccine should be administered annually to the health-care personnels, the higher risk persons who had suffered from influenza, and household contacts and caregivers of higher risk persons. Since 2009 pregnant women could be administered with split vaccine in Japan. Since the split vaccine in Japan contains 1-10 ng/mL of ovalbumin, children with egg-allergy could be administered safely.