Intranasal vaccines are a type of vaccine administered through the nose, allowing for direct delivery to the mucosal surfaces of the respiratory system. This method can stimulate both systemic and local immune responses, potentially providing better protection against respiratory infections compared to traditional injections. These vaccines are often easier to administer, as they do not require needles, making them more accessible for people who may be afraid of injections. Intranasal vaccines are being researched for various diseases, including influenza and COVID-19, and may offer a convenient option for mass vaccination campaigns.