>But not all nasal vaccines< -- True! Perhaps a two stage nasal inoculation is required, maybe one squirt of vaccine, plus mucous membrane penetrator, followe

>But not all nasal vaccines< -- True! Perhaps a two stage nasal inoculation is required, maybe one squirt of vaccine, plus mucous membrane penetrator, followed by a second squirt of vaccine, plus mucous membrane sealer. search: >'intranasally administered heparin'< @DDG : <https://html.duckduckgo.com/html/?q='intranasally administered heparin' https://html.duckduckgo.com/html/?q='intranasally administer...>