Research is being conducted on the mucosal immune response and its role in various biological processes and diseases. The response is being studied in relation to conditions such as immunoglobulin A nephropathy, dengue, respiratory syncytial virus, cancer metastasis, viral infections, influenza, and periodontitis. The studies also explore potential therapeutic applications, including mucosal vaccination, intranasal vaccines, and the use of engineered viral receptor binding domains to confer protection against infection.