Abstract
Respiratory syncytial virus (RSV) infection in infants and toddlers is a major public health problem. Here, we provide a protocol for neonatal RSV infection in mice and immune analysis of infected lungs and bronchoalveolar lavage (BAL) fluid. We describe steps for anesthesia and intranasal inoculation, weight monitoring, and whole lung collection. We then detail BAL fluid immune and whole lung analyses. This protocol can be used for neonatal pulmonary infection with other viruses or bacteria.