Murdoch Childrens Research Institute May 7 2026 A new study will explore the effects of a nasal spray flu vaccine on children's immune systems, aiming to boost future protection and lower vaccine hesitancy rates. The study, led by Murdoch Children's Research Institute (MCRI), involves FluMist, a nasal spray vaccine manufactured by AstraZeneca, as well as the standard, injectable flu shot to better understand a child's immune response to each. Parents can choose which vaccine option they prefer