By Hugo Francisco de Souza Reviewed by Susha Cheriyedath, M.Sc. Feb 15 2026 A novel nasal booster approach may help close the gap between systemic vaccination and infection-blocking mucosal immunity, offering fresh insight into next-generation COVID vaccine strategies.  Study: Intranasal booster drives class switching and homing of memory B cells for mucosal IgA response . Image Credit: Jo Panuwat D / Shutterstock Current intramuscular vaccines excel at eliciting blood-based immunity but

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