Abrysvo RSV Vaccine (Respiratory Syncytial Virus Vaccine) 0.5 mL Kit (Rx) **Refrigerated ItemAbrysvo (RSV Vaccine) 0. 5 mL Injection Abrysvo is a vaccine made by Pfizer that protects against respiratory syncytial virus (RSV), a common respiratory virus that can cause serious lung infections (lower respiratory tract disease, like bronchitis or pneumonia) in infants and older adults. Abrysvo is a bivalent recombinant subunit vaccine it contains laboratory made versions of the RSV fusion (F) protein (from both RSV A and RSV B strains) in its