As federal officials wax poetic about the prospect of intranasal COVID-19 vaccines and other novel vaccine platforms, Pfizer Inc. (NYSE:PFE) and its partner BioNTech (Nasdaq:BNTX) have announced that a randomized Phase 2 study will study an incrementally improved COVID-19 vaccine known as BNT162b5. The updated vaccine candidate includes a modified spike protein designed to bolster immunogenicity…