Vaxcyte, Inc. (NASDAQ: PCVX) is developing next-gen vaccines using its XpressCF platform to prevent bacterial infections, focusing on VAX-31 and VAX-24 pneumococcal vaccines. VAX-31, in Phase 1/2 trials, aims to start Phase 3 by mid-2025, potentially securing a best-in-class position in the pneumococcal vaccine market.