|As with other factors relating to vaccinations, the best route of administration of a vaccine depends on the situation. Vaccines must always be administered as stated by the manufacturer. Sites at which the vaccine can be administered will appear on the vaccine label. Intranasal vaccines should never be injected, and vaccines designed for injection should never accidentally get into the eyes, nose, or mouth.
In general, if an intranasal product is available, it will provide faster protection than an injectable vaccine. Intranasal vaccines are less likely to cause allergic reactions, and are more likely to provide protection if maternal antibodies are still present. In the case of Bordetella, intranasal vaccines may need to be given more often than injectable vaccines.
If more than one vaccine is being given, the vaccines should be given at separate sites, and never be mixed together.