The flu vaccine can also be administered as a nasal spray instead of the usual injection method. It is an alternative for healthy, non-pregnant people age 2 to 49 who want to be protected from the flu virus. Unlike the regular vaccine, it is a live virus. Therefore, it is best if the person receiving it does not have close contact with people who have a weakened immune system.
David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc., David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine.