80 subjects (healthy adults) will be randomized to receive the seasonal flu vaccine either by needle \& syringe or by the MIT needle-free injector (Med-Jet MIT H4â„¢ \& Disposable Cartridge). The study will be conducted after the normal flu season has passed (ie: March-April). Half of those randomized to standard vaccination (n=20) will receive vaccine drawn from a multi-dose vial while the other half (n=20) will receive vaccine drawn from a single use vial. The same vaccine as the multi-dose vial will be delivered to the other half of the subjects (n=40) using the MIT injector. How long it takes to prepare and deliver the vaccines will be assessed (a time-motion study). Subject acceptance before and after injection will be assessed as well as local and systemic side effects. Standard serologic measures of immune response to flu vaccination (ie: antibodies) will determine whether the Med-Jet H4 injector induces the same kind of immune response as needle \& syringe delivery.
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Local and systemic effects will be measured after vaccination
Timeframe: 0 - 21 days