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Might still be interesting if you need to go to a high risk area temporarily - or if you want to stop the spread of a new disease before it becomes a pandemic.Ygggdrasil said:The major advantage of a vaccine over a prophylactic nasal spray would be that a vaccine would give lasting protection after 1-2 doses whereas the prophylactic nasal spray would likely have to be re-applied frequently to offer protection throughout the periods where the viruses are being transmitted.