by Gina Wadas, Johns Hopkins University Graphical Abstract. Credit: Matter (2022). DOI: 10.1016/j.matt.2022.11.027 What if preventing respiratory illnesses such as COVID-19 and influenza could be as easy as a quick spritz of nasal spray every morning? Numerous bacteria and viruses, including those that cause COVID-19 and influenza, enter the body through the lungs when people breathe, resulting...