By Vijay Kumar Malesu Reviewed by Benedette Cuffari, M.Sc. Sep 8 2025 An everyday allergy spray lowered coronavirus and cold infections in a clinical trial, sparking interest in its potential as a simple, over-the-counter defense against respiratory viruses. Study: Azelastine Nasal Spray for Prevention of SARS-CoV-2 Infections: A Phase 2 Randomized Clinical Trial. Image Credit: Ground Picture / Shutterstock.com Despite widespread vaccination rates and established population immunity, the severe

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